C Program To Convert Binary To Octal

In this post, we will learn how to convert binary to octal using C Programming language.

C Program To Convert Binary To Octal

This program will take a binary number as input from the user and convert it into an octal number using a user-defined function.

So, without further ado, let’s begin this tutorial.

C Program To Convert Binary To Octal

// C Program To Convert Binary To Octal
#include <stdio.h>
#include <math.h>

int binaryToOctal(long num){
    int octal = 0, decimal = 0, i = 0;
    
    while (num != 0){
        decimal = decimal + (num % 10) * pow(2, i);
        i++;
        num = num / 10;
    }
    
    i = 1;
    while (decimal != 0){
        octal = octal + (decimal % 8) * i;
        decimal = decimal / 8;
        i = i * 10;
    }
    return octal;
}

int main(){
    long num;
    
    // Asking for Input
    printf("Enter a binary number: ");
    scanf("%ld", &num);
    
    printf("Equivalent Octal Number is: %d", binaryToOctal(num));
    return 0;
}

Output

Enter a binary number: 10010
Equivalent Octal Number is: 22

How Does This Program Work ?

    long num;

In this program, we have declared a long int data type variable named as num.

    // Asking for Input
    printf("Enter a binary number: ");
    scanf("%ld", &num);

Then, the user is asked to enter a binary number. The value of this binary number will get stored in the num named variable.

 printf("Equivalent Octal Number is: %d", binaryToOctal(num));

Now, we call our user defined function named binaryToOctal which converts a binary number into an octal number and returns an octal number.

int binaryToOctal(long num){
    int octal = 0, decimal = 0, i = 0;
    
    while (num != 0){
        decimal = decimal + (num % 10) * pow(2, i);
        i++;
        num = num / 10;
    }
    
    i = 1;
    while (decimal != 0){
        octal = octal + (decimal % 8) * i;
        decimal = decimal / 8;
        i = i * 10;
    }
    return octal;
}

We have defined a custom function named binaryToOctal. This function first converts the binary number into a decimal number, and then converts the decimal number into an octal number.

Conclusion

I hope after going through this post, you understand how to convert binary into octal using C Programming language.

If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to help you.

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