C Program to Convert Octal to Decimal

In this tutorial you will learn about the C Program to Convert Octal to Decimal and its application with practical example.

C Program to Convert Octal to Decimal

In this tutorial, we will learn to create a C program that will Convert Octal to Decimal in C programming.

Table Of Contents−

C Program to Convert Octal to Decimal

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.
While loop in C programming.

Program to Convert Octal to Decimal:-

As we all know the c is a very powerful language. With the help of c programming language, we can make many programs. We cal perform many input-output operations using c programming. In today’s tutorial, we take the input in octal from the user and convert it into Decimal. With the help of c programming, we can perform many conversion operations.

With the help of this program, we can Convert octal to Decimal.

Algorithm:-

1. Declare the variables for the program. 

2. Takeing the input number from the user in octal for the program. 

3. Passing that input to the string function.

4. Pass that number to a for loop for convertion.  

4. Print the Result. 

5. End the program.

1. Declare the variables for the program.

2. Takeing the input number from the user in octal for the program.

3. Passing that input to the string function.

4. Pass that number to a for loop for convertion.

4. Print the Result.

5. End the program.

Program to Convert Octal to Decimal:-

/* C Program to Convert Octal to Decimal */


#include <stdio.h>
#include <math.h>
/* creating a user defined function to convert the octal number to the decimal number */
long long convertOctalToDecimal(int octalNumber);
int main()
{
    //declaring the variable for the program
    int octalNumber;
    /* taking input from the user in octal number */
    printf("Enter an octal number: ");
    scanf("%d", &octalNumber);
    /* Printing the output number coverted to decimal in the program */
    printf("%d in octal = %lld in decimal", octalNumber, convertOctalToDecimal(octalNumber));

    return 0;
}
/* The body of the function for  convertion */
long long convertOctalToDecimal(int octalNumber)
{
    int decimalNumber = 0, i = 0;

    while(octalNumber != 0)
    {
        decimalNumber += (octalNumber%10) * pow(8,i);
        ++i;
        octalNumber/=10;
    }

    i = 1;

    return decimalNumber;
}

/* C Program to Convert Octal to Decimal */

#include <stdio.h>

#include <math.h>

/* creating a user defined function to convert the octal number to the decimal number */

long long convertOctalToDecimal(int octalNumber);

int main()

{

//declaring the variable for the program

int octalNumber;

/* taking input from the user in octal number */

printf("Enter an octal number: ");

scanf("%d", &octalNumber);

/* Printing the output number coverted to decimal in the program */

printf("%d in octal = %lld in decimal", octalNumber, convertOctalToDecimal(octalNumber));

return 0;

}

/* The body of the function for convertion */

long long convertOctalToDecimal(int octalNumber)

{

int decimalNumber = 0, i = 0;

while(octalNumber != 0)

{

decimalNumber += (octalNumber%10) * pow(8,i);

++i;

octalNumber/=10;

}

i = 1;

return decimalNumber;

}

Output:-

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

octalNumber = in will hold the integer value for the input.

Taking the input.

Function for Binary to decimal.

Printing the Decimal data.

Main Function.

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C Program to Convert Octal to Decimal