Tag Archives: Basic Programs

C Program to Count number of digits in number without using mod operator

C Program to Count the number of digits in number without using the mod operator.

In this tutorial, we will learn to create a C program that will Count the number of digits in number without using the mod operator in C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.
Basic Input and Output function in C Programming.
Basic C programming.
String functions in c programming.

Count the number of digits in number without using the mod operator.

As we all know the c programming is a very powerful language. In the c programming language, we have many pre-defined functions for arithmetic operations. but today we will count the number of digits in a number without using the mod operator.

With the help of this program, we can count the number of digits in numbers without using the mod operator.

Algorithm:-

1. Declare the variables.

2. Take the input number from the user.

3. Pass that number to a string type variable.

4. Calculate the size of string.

5. Print the size of that string.

6. End the program.

1. Declare the variables.

2. Take the input number from the user.

3. Pass that number to a string type variable.

4. Calculate the size of string.

5. Print the size of that string.

6. End the program.

Program to count the number of digits in numbers without using the mod operator:-

#include<stdio.h>
//importing the header file
#include<string.h>
 
int main() 
{
    //declaring local variable for the program.
   int no, digits;
   char ch[10];
 
   //Taking input from the user for calculating the number digits in number
   printf("\nEnter the Number : ");
   scanf("%d", &no);
 
   //passing that number to a string variable 
   sprintf(ch, "%d", no);
   
   //storing the sting size by using pre defined function
   digits = strlen(ch);
   
   //Printing output of the program
   printf("\nNumber of Digits in given number : %d", digits);
 
   return(0);
}

#include<stdio.h>

//importing the header file

#include<string.h>

int main()

{

//declaring local variable for the program.

int no, digits;

char ch[10];

//Taking input from the user for calculating the number digits in number

printf("\nEnter the Number : ");

scanf("%d", &no);

//passing that number to a string variable

sprintf(ch, "%d", no);

//storing the sting size by using pre defined function

digits = strlen(ch);

//Printing output of the program

printf("\nNumber of Digits in given number : %d", digits);

return(0);

}

Output:-

Including header files.

In the above program, we have first initialized the required variable.

ch[10] = it will hold the string value.
digits = it will hold the integer value for numbers.

no = it will hold the integer value of number input.

Taking input number from the user.

Converting that number to a string.

Storing the string size by using a predefined function.

Printing output of the program.

C Program to Add numbers without using arithmetic Operators

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In this tutorial, we will learn to create a C program that add two number without using arithmetic operator(+) using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

C Operators
Loop statements
C while Loop.

Program to Add two numbers without using arithmetic Operators.

Easiest way for adding two numbers without using arithmetic operator ‘+’ in C is with using increment(++) and decrement(–) operator .

In this program we will add two number using while loop.
Firstly we declare required header file and variable and also initiates required values in variable. Next we take value from user at run time and then after we will add these two values without using arithmetic operator.

Let see the code for our program.

#include <stdio.h>
int main() {
    int a,b; //declaring variable 
    printf("Enter two values"); // taking two values from user
    scanf("%d%d",&a,&b);
    while(b!=0) // traversing the loop
        {
            a++; // incrementing by 1
            b--; // decrementing by 1
        }
        printf("Sum of two number is =%d" ,a); //output
        
    return(0);
}

#include <stdio.h>

int main() {

int a,b; //declaring variable

printf("Enter two values"); // taking two values from user

scanf("%d%d",&a,&b);

while(b!=0) // traversing the loop

{

a++; // incrementing by 1

b--; // decrementing by 1

}

printf("Sum of two number is =%d" ,a); //output

return(0);

}

Output

C Program to Add numbers without using arithmetic Operators

In the above program, we have first declared and initialized a set variables required in the program.

a = taking value from user in first variable.
b = taking value from user in second variable.

For adding 2 integer values without using arithmetic operators(+,-*,/), we can do this with using increment and decrement operator.

Take a look in below image.

The above condition tells you what is actually we have done , we used increment and decrement operator instead of ( + ) or ( – ) to add two numbers

Firstly we got two numbers from user in a variable a and b . Then, we check the condition until the second variable b is not equal to 0. If it’s zero, we terminate the loop . If it’s a not zero number, then execute the following statement .

in which in each iteration the value of a increment to 1 and the value of b decrement to 1.The above statement will run until while (b!=0).

then in each iteration value of a is added and this process continues and we get final required output.

C Program to Add two numbers without using arithmetic Operators also possible Using logarithm and exponential functions and either using pointers or using bit-wise operators.

C Program to Demonstrate Printf inside Another Printf Statement

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C Program to Demonstrate Printf inside Another Printf Statement

In this tutorial, we will learn to create a C program that will Demonstrate Printf inside Another Printf Statement using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.
Basic Input and Output function in C Programming.
Basic C programming.

Demonstrate Printf inside Another Printf Statement :-

As we all know every programming language the program cannot be completed without taking input or returning output. In C programming language printf() and scanf() functions are inbuilt library functions in which are available in C library by default. These functions are declared and related macros are defined in “stdio.h” which is a header file in C language.

We only have to include the header file named as “stdio.h” as shown in below C program to make use of these printf() and scanf() library functions in C language.

Printf function is used to write the output or show message on the screen.

In nested printf Inner most printf() function writes the output of the program.

Second printf() function counts the output number’s digits and write them.

And third printf() function will write the number of digits returned by the second printf() function

Algorithm:-

STEP 1: START

STEP 2: INITIALIZE variable for program

STEP 3: take input number from the user

STEP 4: create nested printf()

STEP 5: pass the variable value to print

STEP 6: Return 0.

STEP 7: END.

STEP 1: START

STEP 2: INITIALIZE variable for program

STEP 3: take input number from the user

STEP 4: create nested printf()

STEP 5: pass the variable value to print

STEP 6: Return 0.

STEP 7: END.

Program:-

Demonstrate Printf inside Another Printf Statement.

#include<stdio.h>
 //MAIN FUNCTION CODE
int main() 
{
 //declaring variable 
 int no;
 
 // taking input from user 
 printf("enter the number="); 
 scanf("%d",&no);
 
 //Printing the data using the nested printf functions 
 //Firstly Inner printf is executed which results in printing no
 //This Printf Returns total number of Digits
 //It prints 4 and Returns the total number of digits 
 //i.e 1 (4 is single digit number )
 printf("%d", printf("%d", printf("%d", no)));
 
 return(0);
}

#include<stdio.h>

//MAIN FUNCTION CODE

int main()

{

//declaring variable

int no;

// taking input from user

printf("enter the number=");

scanf("%d",&no);

//Printing the data using the nested printf functions

//Firstly Inner printf is executed which results in printing no

//This Printf Returns total number of Digits

//It prints 4 and Returns the total number of digits

//i.e 1 (4 is single digit number )

printf("%d", printf("%d", printf("%d", no)));

return(0);

}

Output:-

The above program we have to first initialize the required variable.

no = it will hold the integer value.

Taking Input from the user an integer value.

Printing using Printf inside Another Printf Statement.

C Program to Display Day of the month

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In this tutorial, we will learn to create a C program that will accept year,month and date from user and display the day of month using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

C Operators.
Basic input/output.
C loop statements
C switch case.
Function in C.

Example:

If you give value input in particular format like year=2021, Month=5, and day is 12 then this program will display the output as The Given Date is : 12/05/2021 and Day of Week of the Date : Wednesday.

C Program to Display Day of the month.

In this program we will print name of the Day of week and Date of calendar for given year, month and day. Please check out the program below to print, Name of Day of week and Date of calendar.

#include<stdio.h>
#include<math.h>
    int main(){    // taking year,month and day from user...
                  int date, month, year;
                  printf("Enter year: ");
                  scanf("%d",&year);
                  printf("Enter month : ");
                  scanf("%d",&month);
                  printf("Enter date : ");
                  scanf("%d",&date);
                  week_day(date,month,year); // passing to function..
                  return 0;
                  }
    int week_day(int date, int month, int year) {
           int weekday, yy,century ;
           yy = year % 100;
           century  = year / 100;
           printf("The Date Given is : %d / %d / %d \n\n", date, month, year);
           weekday = 1.25 * yy + findmonth(month, year) + date - 2 * (century  % 4);
           weekday = weekday % 7;
           switch (weekday){ // finding the day of given date,month.
           case 0:  printf("Day of Week is : Saturday");
                        break;
           case 1:  printf("Day of Week is : Sunday");
                        break;
           case 2:  printf("Day of Week is : Monday");
                        break;
           case 3:  printf("Day of Week is : Tuesday");
                        break;
           case 4:  printf("Day of Week is : Wednesday");
                        break;
           case 5:  printf("Day of Week is : Thursday");
                        break;
           case 6:  printf("Day of Week is : Friday");
                        break;
           default:  printf("The  inputed data is wrong");
           }
           return 0;
           }
    int findmonth(int months, int year){
           int find_month, leapyear;
           if ((year % 100 == 0) && (year % 400 != 0))
           leapyear = 0;
           else if (year % 4 == 0)
           leapyear = 1;
           else
           leapyear = 0;
           find_month = 3 + (2 - leapyear) * ((months + 2) / (2 * months))
+ (5 * months + months / 9) / 2;
           find_month = find_month % 7;
           return find_month;
    }

#include<stdio.h>

#include<math.h>

int main(){ // taking year,month and day from user...

int date, month, year;

printf("Enter year: ");

scanf("%d",&year);

printf("Enter month : ");

scanf("%d",&month);

printf("Enter date : ");

scanf("%d",&date);

week_day(date,month,year); // passing to function..

return 0;

}

int week_day(int date, int month, int year) {

int weekday, yy,century ;

yy = year % 100;

century = year / 100;

printf("The Date Given is : %d / %d / %d \n\n", date, month, year);

weekday = 1.25 * yy + findmonth(month, year) + date - 2 * (century % 4);

weekday = weekday % 7;

switch (weekday){ // finding the day of given date,month.

case 0: printf("Day of Week is : Saturday");

break;

case 1: printf("Day of Week is : Sunday");

break;

case 2: printf("Day of Week is : Monday");

break;

case 3: printf("Day of Week is : Tuesday");

break;

case 4: printf("Day of Week is : Wednesday");

break;

case 5: printf("Day of Week is : Thursday");

break;

case 6: printf("Day of Week is : Friday");

break;

default: printf("The inputed data is wrong");

}

return 0;

}

int findmonth(int months, int year){

int find_month, leapyear;

if ((year % 100 == 0) && (year % 400 != 0))

leapyear = 0;

else if (year % 4 == 0)

leapyear = 1;

else

leapyear = 0;

find_month = 3 + (2 - leapyear) * ((months + 2) / (2 * months))

+ (5 * months + months / 9) / 2;

find_month = find_month % 7;

return find_month;

}

Output

C Program to Display Day of the month

In the above program, we have first declared and initialized a set variables required in the program.

This program will accept three values from user Year,Month and Date.Then we passes all three value to function called week_day it will accept all three values.With the help or week_day() function we calculate month day and week day.Within this function we gain called a function findmonth(). we find the month value and returns the value to week_day() function where we will find the day of week and print our required output.

C program to shut down or turn off computer

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C program to shut down or turn off computer

In this tutorial, we will learn to create a C program that will shut down or turn off the computer using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.
Basic Input and Output function in C Programming.
Basic C programming.
Header Libraries and its usage.

Shut down or Turn off computer

In c programming it is possible shut down or turn off with the help of very small amount of code . The C language has many types of header libraries which has supported function in them with the help of these files the programming is easy.

Shutting Pc with the help of c program is so easy.

Algorithm:-

1. Include stdlib.h
2. Call the System Function
3. Execute the Program.

1. Include stdlib.h

2. Call the System Function

3. Execute the Program.

Program to shut down or turn off the computer :-

Program For Windows 7:-

#include <stdio.h>
#include <stdlib.h>
  
int main()
{
 // this function will shut the pc 
  system("c:\\windows\\system32\\shutdown /s");
  return 0;
}

#include <stdio.h>

#include <stdlib.h>

int main()

{

// this function will shut the pc

system("c:\\windows\\system32\\shutdown /s");

return 0;

}

Note to shutdown immediately use “C:\\WINDOWS\\System32\\shutdown -s -t 0”. To restart use “-r” instead of “-s”.

Here, “shutdown /s /t x”; where x is the number of seconds after which shutdown will occur.

Program For Windows xp:-

#include <stdio.h>
#include <stdlib.h>
int main()
{
   char ch;

   printf("Do you want to shutdown your computer now (y/n)\n");
   scanf("%c", &ch);

   if (ch == 'y' || ch == 'Y')
      // this function will shut the pc 
      system("C:\\WINDOWS\\System32\\shutdown -s");

   return 0;
}

#include <stdio.h>

#include <stdlib.h>

int main()

{

char ch;

printf("Do you want to shutdown your computer now (y/n)\n");

scanf("%c", &ch);

if (ch == 'y' || ch == 'Y')

// this function will shut the pc

system("C:\\WINDOWS\\System32\\shutdown -s");

return 0;

}

Note to shutdown immediately use “C:\\WINDOWS\\System32\\shutdown -s -t 0”. To restart use “-r” instead of “-s”.

Here, “shutdown /s /t x”; where x is the number of seconds after which shutdown will occur.

Program for Ubuntu:-

#include <stdio.h>
int main() {
  // this function will shut the pc
 // linux os command for the shutting down of the pc
  system("shutdown -P now");
  return 0;
}

#include <stdio.h>

int main() {

// this function will shut the pc

// linux os command for the shutting down of the pc

system("shutdown -P now");

return 0;

}

Output:-

The program we have to first include stdlib.h and then we call the system function.

C program to get IP address

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C program to get IP address

In this tutorial, we will learn to create a C program that will get the IP address of computer using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.
Basic Input and Output function in C Programming.
Basic C programming.
Array in C Programming.
Header Libraries and its usage.

Get IP address

In c programming, it is possible to take or fetch the ip address from the computer and convert it into words or can display in words with the help of a very small amount of code. The C language has many types of header libraries which has supported function in them with the help of these files the programming is easy.

Algorithm:-

1. Create a socket to define network interface IPv4.
2. Define the IPv4 address type.
3. Define the port name where network is attached.
4. Access the network interface information by passing address using ioctl.
5. Extract the IP address.

1. Create a socket to define network interface IPv4.

2. Define the IPv4 address type.

3. Define the port name where network is attached.

4. Access the network interface information by passing address using ioctl.

5. Extract the IP address.

Program:-

/*
 * C Program For Getting The IP Address
 */
 // including the required Header Files
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <unistd.h>
#include <arpa/inet.h>
 
int main()
{
    //Declaring the variables
    int no;
    struct ifreq ifr;
    char array[] = "eth0";
    
    no = socket(AF_INET, SOCK_DGRAM, 0);
    //From PC Type of address to retrieve - IPv4 IP address
    ifr.ifr_addr.sa_family = AF_INET;
    //Copying the interface name in the ifreq structure
    strncpy(ifr.ifr_name , array , IFNAMSIZ - 1);
    ioctl(no, SIOCGIFADDR, &ifr);
    close(no);
    //display result
    printf("IP Address is %s - %s\n" , array , inet_ntoa(( (struct sockaddr_in *)
    &ifr.ifr_addr )->sin_addr) );
    return 0;
}

* C Program For Getting The IP Address

// including the required Header Files

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/ioctl.h>

#include <netinet/in.h>

#include <net/if.h>

#include <unistd.h>

#include <arpa/inet.h>

int main()

{

//Declaring the variables

int no;

struct ifreq ifr;

char array[] = "eth0";

no = socket(AF_INET, SOCK_DGRAM, 0);

//From PC Type of address to retrieve - IPv4 IP address

ifr.ifr_addr.sa_family = AF_INET;

//Copying the interface name in the ifreq structure

strncpy(ifr.ifr_name , array , IFNAMSIZ - 1);

ioctl(no, SIOCGIFADDR, &ifr);

close(no);

//display result

printf("IP Address is %s - %s\n" , array , inet_ntoa(( (struct sockaddr_in *)

&ifr.ifr_addr )->sin_addr) );

return 0;

}

Output:-

The above program we have first initialize the required variable.

no = it will hold the integer value ip.
ifreq = it will hold the interface name in the ifreq structure.
ifr = it will hold the address type.
array[] = it will hold the integer value for numbers of ip address.

Including the header files required for program

Body of program retrieving the ip address

Main Program

C program to print date

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In this tutorial, we will learn to find current system date day and time using C programming language. There are many different method to find system date and time in C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

C library.
Operators.
in-built functions.
Basic input/output.
Basic C programming.

Often we need to work on current date and time in our program.

C program to print date

Here we write a program, in which we want to check current date and time to given date and time to confirm the user age .Now we will see how to write a C program to print current date and time.

#include<stdio.h>
#include<time.h>
int main()
{
    time_t t; // datatype of ISO library
    time(&t); // standard time fucntion
    printf("Current system Day Month date ,time and year = %s"
, ctime(&t)); // current day and time
    return 0;
}

#include<stdio.h>

#include<time.h>

int main()

{

time_t t; // datatype of ISO library

time(&t); // standard time fucntion

printf("Current system Day Month date ,time and year = %s"

, ctime(&t)); // current day and time

return 0;

}

Output

Here how the above program works:

Here we have taken The time_t datatype it is a data type from the C ISO library which is define to store system’s time value.

time() function will returns the system date and time.

With the help of function ctime() it will returns a string that shows the local time based on t (parameter) timer. This ctime() function is defined in time.h header file.we just need to include inbuilt header file in our program and function define within header file just need call them and that’s it our will call system day and all..

C program to print date

that will give the current day, month , date , time and year..

C program to check number is positive negative or zero

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In this tutorial, we will learn to create a C program that will find weather a number is positive, negative or Zero using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

C Operators
If-else statement.
Nested else-if
Basic c programming.
Basic input/output.

C program to check whether a number is positive, negative or zero.

In this program we will find whether a number is positive, negative or zero series using if else statement. We would first declared and initialized the required variables. Next, we would prompt user to input any number. Later we will find that number is positive,negative or zero.

#include <stdio.h>
int main()
{ 
    int number; // declaring variables
    printf("Enter any number: ");
    scanf("%d", &number); // taking value of number..
    
    if(number> 0)   // checking conditions... for positive
    {
        printf("Number is Positive = %d",number);
    }
    else
    {
       if(number < 0) // checking conditions... for negative
      {
          printf("Number is Negative = %d",number);
      }
      else
      {
        if(number == 0)  // checking conditions... for Zero
        {
           printf("Number is equvalent to Zero = %d",number);
        }
      }
    }
    return 0;
}

#include <stdio.h>

int main()

{

int number; // declaring variables

printf("Enter any number: ");

scanf("%d", &number); // taking value of number..

if(number> 0) // checking conditions... for positive

{

printf("Number is Positive = %d",number);

}

else

{

if(number < 0) // checking conditions... for negative

{

printf("Number is Negative = %d",number);

}

else

{

if(number == 0) // checking conditions... for Zero

{

printf("Number is equvalent to Zero = %d",number);

}

return 0;

}

Output

Positive Value.

Negative Value

Zero Value.

In the above program, we have first declared and initialized a set variables required in the program.

number = it will hold the value of number.

In the next statement user will be prompt to enter any number terms which will be assigned to variable ‘number’.

For finding given integer is positive ,negative or zero we will use We will use nested if else statement

in above logic inside if we check if(number > 0), number is greater than zero then number is positive.

if(number < 0) if number less than zero then number is negative. and if

if(number == 0), then number is zero.

Here the C program to find whether a number is positive, negative or zero.The above approach is easiest way find the problem. First we check condition for positive number, then for negative or and later we find for zero.

C Program to print all Happy Numbers till N

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In this tutorial, we will learn to create a C program that will find Happy number using C programming.

Prerequisites

Before starting with this program we assume that you are best aware of the following C programming topics:

C Operators.
C loop statements.
C while and for Loop.
Conditional statement.

What Is Happy Number ?

Happy number is a number which finally ends at 1 when it is replaced by the sum of the square of its digits repeatedly.

Example

let’s take an example here 13 is a happy number

, and .

On the other hand,The unhappy number will result in a cycle of 4, 16, 37, ….

2 is not a happy number let’s have a look an example of this

and this process continues to infinite cycle without ever reaching 1

C Program to print all Happy Numbers till N

In this program we will find that given number is happy number or not using for loop.
Firstly we declare required header file and variable and also initiates required values in variable. Next we take value from user at run time and then after we will find that the given value is happy number or not.

#include<stdio.h>
int main()
{
 int i,j,no,happy_no,tmp,sum=0;
 printf("Enter any value till you want print happy numbers\n");
 scanf("%d",&happy_no); // taking value from user
   for(i=1;i<=happy_no;i++) // loop until reaches to given value
   {
    sum=0;
    no=i;
    tmp=no;
     while(sum!=1 && sum!=4)
  {
   sum=0;
   while(no>0)
  {
    j=no%10; 
    sum+=(j*j);
    no=no/10; 
  }
  no=sum;
  }
  if(sum==1) // ending value of number
  {
   printf("%d\n",i); // printing happy number
  }
   }
return(0);  
}

#include<stdio.h>

int main()

{

int i,j,no,happy_no,tmp,sum=0;

printf("Enter any value till you want print happy numbers\n");

scanf("%d",&happy_no); // taking value from user

for(i=1;i<=happy_no;i++) // loop until reaches to given value

{

sum=0;

no=i;

tmp=no;

while(sum!=1 && sum!=4)

{

sum=0;

while(no>0)

{

j=no%10;

sum+=(j*j);

no=no/10;

}

no=sum;

}

if(sum==1) // ending value of number

{

printf("%d\n",i); // printing happy number

}

return(0);

}

Output

C Program to print all Happy Numbers till N

A happy number is defined by the following steps:

STEP 1: START.
STEP 2: SET tmp =0, sum =0.
STEP 3: REPEAT STEP 4 to 6 UNTIL (no>0)
STEP 4: tmp=no%10.
STEP 5: sum = sum + (tmp*tmp)
STEP 6: no= no/10.
STEP 7: RETURN sum.
STEP 8: END.
If the number given is greater than 0 (no>0 ),First we find remainder by dividing the number with 10 ( tmp=no %10 ).

Calculate square of tmp and add it to sum.
Then divide number by 10 ( no=no/10).
Repeat the steps from 4 to 6 until the sum of the square of all digits present in number has been calculated.
Finally, print the sum.

So finally we get all the happy number from one to given number by user…..

C Program to print whether given Number is Happy or not

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In this tutorial, we will learn to create a C program that will find the given number is a happy or not using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

C Operators.
Loop statements.
While and for Loop.
Conditional statement.

What Is Happy Number ?

Happy number is a number which finally ends at 1 when it is replaced by the sum of the square of its digits repeatedly.

Program to print whether given Number is Happy or not ?

in this program we are going to find that the given number is happy or not ?.As we explained happy number is a number which finally ends at 1 when it is replaced by the sum of the square of its digits repeatedly.In this program we will find that given number is happy number or not using for loop.
Firstly we declare required header file and variable and also initiates required values in variable. Next we take value from user at run time and then after we will find that the given value is happy number or not.

#include<stdio.h>
main()
{
 int i,j,no,tmp,sum=0;
 printf("Enter any number to find number is happy or not \n");
 scanf("%d",&no); // taking value from user
  while(sum!=1 && sum!=4) //  checking condition
  {
   sum=0;
   while(no>0) // iterate until number became zero 
  {
    j=no%10;
    sum+=(j*j);
    no=no/10; 
  }
  no=sum;
  }
  
  if(sum==1)
 printf(" Number is Happy Number");
 else
 printf("Number is UnHappy");
}

#include<stdio.h>

main()

{

int i,j,no,tmp,sum=0;

printf("Enter any number to find number is happy or not \n");

scanf("%d",&no); // taking value from user

while(sum!=1 && sum!=4) // checking condition

{

sum=0;

while(no>0) // iterate until number became zero

{

j=no%10;

sum+=(j*j);

no=no/10;

}

no=sum;

}

if(sum==1)

printf(" Number is Happy Number");

else

printf("Number is UnHappy");

}

Output

C Program to print whether given Number is Happy or not

A number is said to be happy if it leads to 1 when we calculate the square of each digit present in number and them. if resulting sum is equal to 1 then the given number we can say it is a happy number.

example.

Let’s understand with an example:

In our example we have taken 13 to find that this number is happy or not,we first break 13 to get the sum of squares of its digits which gives us another number (10), we interchange 13 by 10 to continue this process until we get result as 1.So 13 a happy number.As we discuss above happy number is a number that will give 1 at the end on continues after a sequence of steps wherein each step number is replaced by the sum of squares of its digit.
In our example we can see that 13 is a happy number.

C program to enter 5 subjects marks and calculate percentage.

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In this tutorial, we will learn to create a C program that will take five subjects marks and Calculate Percentage using C programming.

Prerequisites

Before starting with this program we assume that you are best aware of the following C programming topics:

C Operators.
Conditional statement.
Basic input/output.

Example.

Here we will create a program in which user enter the marks of five subjects and calculate percentage. And you will learn how to find percentage of the five subjects in C language.

C Program to Calculate entered 5 subjects marks and calculate percentage.

First of all we take five number from user and add them to find total then divide the total by 5 to get our desired percentage .Here is a program for that have a look.

#include<stdio.h>
int main()
{
    int m,p,c,h,e,total=0;
    float per;
    printf("Enter 5 Subject  marks :\n ");
    scanf("%d%d%d%d%d",&m,&p,&c,&h,&e); // taking values from user
    total=m+p+c+h+e; 
    printf("Sum of 5 Subjects is: %d\n",total);
    per=total/5; // calculating the percentage 
    printf("Percentage is: %f",per); // printing the percentage
    return(0);
}

#include<stdio.h>

int main()

{

int m,p,c,h,e,total=0;

float per;

printf("Enter 5 Subject marks :\n ");

scanf("%d%d%d%d%d",&m,&p,&c,&h,&e); // taking values from user

total=m+p+c+h+e;

printf("Sum of 5 Subjects is: %d\n",total);

per=total/5; // calculating the percentage

printf("Percentage is: %f",per); // printing the percentage

return(0);

}

Output

C program to enter 5 subjects marks and calculate percentage.

In the above program, we have first declared and initialized a set variables required in the program.

m = holds value of math.
p = holds value of physics.
c = holds value of chemistry
h = holds value of Hindi.
e= holds value of English.
total = calculate sum of value.
per= it will hold percentage.

In this C program to calculate Percentage of Five Subjects .

The first printf statement will ask the user to enter the 5 subjects number.

then we add all 5 given value in variable total ( total =m+p+c+h+e ).
Now, we calculated the percentage (per=total/5).

And we will get the required output.This program allows user to enter five values of five different subjects. And then calculate the Total and Percentage of those Five Subjects.

C program to enter two angles of a triangle and find the third angle.

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In this tutorial, we will learn to create a C program that will find side of a Triangle.If two side of a Triangle are given using C programming.

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Arithmetic operators
Data types
Basic input/output.

Basic Properties of triangle

The sum of the interior angle on the same vertex is 180°

C Program to enter two angles of a triangle and find the third angle.

Here we take two side of a triangle and with the help of angle property we will find the required third side of a triangle ,Let’s take a look to program.

#include<stdio.h>
int main()
{
  	float ang1,ang2,ang3; // list or arguments
  	printf("Enter two side or angles of a triangle \n");
  	scanf("%f%f",&ang1,&ang2);  // getting values
  	ang3= 180 - (ang1 + ang2);  // calculating third side
  	printf("\n Third side of a Triangle is = %.1f", ang3);
  	return 0;
}

#include<stdio.h>

int main()

{

float ang1,ang2,ang3; // list or arguments

printf("Enter two side or angles of a triangle \n");

scanf("%f%f",&ang1,&ang2); // getting values

ang3= 180 - (ang1 + ang2); // calculating third side

printf("\n Third side of a Triangle is = %.1f", ang3);

return 0;

}

#include<stdio.h>
int main()
{
  	float ang1,ang2,ang3; // list or arguments
  	printf("Enter two side or angles of a triangle \n");
  	scanf("%f%f",&ang1,&ang2);  // getting values
  	ang3= 180 - (ang1 + ang2);  // calculating third side
  	printf("\n Third side of a Triangle is = %.1f", ang3);
  	return 0;
}

#include<stdio.h>

int main()

{

float ang1,ang2,ang3; // list or arguments

printf("Enter two side or angles of a triangle \n");

scanf("%f%f",&ang1,&ang2); // getting values

ang3= 180 - (ang1 + ang2); // calculating third side

printf("\n Third side of a Triangle is = %.1f", ang3);

return 0;

}

output

C program to enter two angles of a triangle and find the third angle.

the above program, we have first declared and initialized a set variables required in the program.

ang1 =it is for holding the angle value 1.
ang2 =it is for holding the angle value 2.
ang3 =it is for holding the angle value 3.

One of the common property of a triangles is that all three(3) interior angles (∠a + ∠b +∠c) of a triangle on adding will give to 180 degrees. This is an important theorem of geometry also known as Triangle Angle Sum Theorem(∠a + ∠b +∠c).According to this Theorem, the sum of the three interior angles in a triangle is always 180°.

So using this triangle angle sum theorem we create a program in which we get two angle from user and by adding them subtract from 180 -(ang1+ang2) we will get our required third angle .

as we can see here by adding two given angle and subtract them from 180 we get the third required angle ..