Count number of bits are set to 1

Write a program to count number of bits are set to 1 in an integer.

SOLUTION:

 /*
 * Count number of bits are set to 1 in an integer. 
 * Written by Shaeed Khan. 
 * Date: 04 Aug 2014
 * Version- 1.0 
 * Language: C
 */

#include < stdio.h >  
#include < stdlib.h > 

void main()
{
 int x,n;
 printf("Enter a number :");
 scanf("%d",&n);
 x=bit_count(n);
 printf("%d ",x);
}

int bit_count(int n)
{
 int c=0;
 while(n>0)
 {
  c++;
  n=n&n-1;
 }
 return c;
}