Binary To Decimal Conversion in C

 Problem: Binary To Decimal Conversion

#include<stdio.h>

#include<conio.h>

#include<math.h>

int main()

{

long long n,x=0;

int a,i;

clrscr();

printf("enter binary no=");

scanf("%lld",&n);

for(i=0;n!=0;++i)

{

a=n%10;

x=a*(pow(2,i))+x;

n=n/10;

}

printf("%lld in decimal",x);

getch();

return 0;

}