How to write an algorithm to find the number of bits set in a typical number ?

#include <stdio.h>
cbs ()

{
unsigned int v; /* count the number of bits set in v */
unsigned int c; /* c accumulates the total bits set in v */

printf("Enter v");
scanf("%u",&v);
for (c = 0; v ; c++)
{
v = v & (v - 1); /* clear the least significant bit set */
}
printf("The number of bits set in v is %u \n",c);

}