convert binary number to decimal in c.

 #include <math.h>

#include <stdio.h>

int convert(long long n);

int main() 

{

    long long n;

    printf("Enter a binary number: ");

    scanf("%lld", &n);

    printf("%lld in binary = %d in decimal", n, convert(n));

    return 0;

}

int convert(long long n)

{

    int dec = 0, i = 0, rem;

    while (n != 0)

    {

        rem = n % 10;

        n /= 10;

        dec += rem * pow(2, i);

        ++i;

    }