pseudo

int size is 32 bits...right?

for(i = 0 to 31)
{
      count += (value & 1) //& = and oprator
      shift left value 
}

main()
{
int n,count=0; 
printf("enter a number");
scanf("%d",&n);//enterd no.is 5
while(n>0)
{
count++;
n=n&n-1;//binary of n is 101
        // binary of n-1 is 100
        //n&n-1 is (i.e 101 
                       &100 =100 )
                         
}
printf("%d",count);
getch();
}         output is 2(i.e 2 ones in 101)

int fnCntbts(int num )
{
 int iCnt = 0;
 while ( num )
 {
   num &= (num-1) ;
  iCnt++;
 } 

return iCnt;

}