Example: C program to convert binary number to octal Number

C
C++
C#
Java
Python
PHP
// C program to convert binary number to octal Number
#include <stdio.h>
#include <math.h>

// It's main function of the program
int main() {
    long long binary_num, temp_binary_num;
    int decimal_num, octal_num, i = 0;

    printf("Enter Binary Number: ");
    scanf("%lld", &temp_binary_num);
    binary_num = temp_binary_num;

    // Step-1 make conversion binary to decimal
    while (temp_binary_num != 0) {
        decimal_num += (temp_binary_num % 10) * pow(2, i);
        ++i;
        temp_binary_num /= 10;
    }
    i = 1;

    // Step-2 then make conversion decimal to octal
    while (decimal_num != 0) {
        octal_num += (decimal_num % 8) * i;
        decimal_num /= 8;
        i *= 10;
    }

    // Final output of the program
    printf("\n%lld (Binary Number) = %d (Octal Number)\n", binary_num, octal_num);
    return 0;
}