C Program convert octal to binary number

 Here, you will find the solution on how to convert the octal number to binary number in the c programming language. Following is the solution to the problem:

Code:

#include <math.h>

#include <stdio.h>

int main() {

    int octal,original;

    printf("Enter an octal number: ");

    scanf("%d", &octal);

  original=octal;

    int deci = 0, i = 0;

    long long bini = 0;


    // convert octal to decimal

    while (octal != 0) {

        deci += (octal % 10) * pow(8, i);

        ++i;

        octal /= 10;

    }

    int a = 1;


   // convert decimal to binary

    while (deci != 0) {

        bini += (deci % 2) * a;

        deci /= 2;

        a*= 10;

    }

    

   printf("%d in octal = %lld in binary", original, bini);

    return 0;

}

Output:

Enter an octal number: 25

25 in octal = 10101 in binary

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