bin_to_dec.c

#include <stdio.h>
#include <math.h>

int main() {
        int n;
        printf("Enter binary: ");
        scanf("%d", &n);

        int power = 0, sum = 0, digit;
        while (n != 0) {
                digit = n % 10;
                sum = sum + (digit * pow(2, power));
                n = n / 10;
                power++;
        }

        printf("Decimal number: %d", sum);
        return 0;
}