14_2_number_of_ones_in_binary_number.cpp

#include<iostream>
using namespace std;

int numberofones(int n)
{
    int count=0;
    while(n)
    {
        n=n & (n-1);
        count++;
    }
    return count;
}


int main()
{
    cout<<numberofones(19)<<endl;

    return 0;
}