PLS SALVADOVIS!!!

#include <stdio.h>
#include <time.h>
#include <math.h>
unsigned long iterativa (unsigned long b, unsigned long n, unsigned long d);
unsigned long recursiva (unsigned long b, unsigned long n, unsigned long d);

 int main(){
    unsigned long b,n=0,d=0;
    scanf("%lu", &b);

    printf("\nInter: %lu\n",iterativa(b,n,d));
    printf("\nRecur: %lu\n",recursiva(b,n,d));

    return 0;
 }

 unsigned long iterativa (unsigned long b, unsigned long n, unsigned long d){
    while (b!=0){
        d+=(b%10)*pow(2,n);
        n++;
        b=(b/10);
    }

    return d;
 }

 unsigned long recursiva (unsigned long b, unsigned long n, unsigned long d){
     if (b!=0)
        d=(b%10)*pow(2,n)+recursiva(b/10,n+1,d);

    return d;
 }