#include<iostream>
#include<stdlib.h>
using namespace std;

int Number1(int n)
{
    int count = 0;
    unsigned int flag = 1;
    while (flag)
    {
        if (flag&n)
            count++;
        flag =  flag << 1;
    }
    return count;
}

int Number2(int n)
{
    int count = 0
 
;
    while (n)
    {
        ++count;
        n = (n - 1)&n;
    }
    return count;
}
//測試用例的選擇正數的最大值，負數的最大最小值
int main()
{
    cout << Number1(0x7fffffff) << endl;
    cout << Number1(0x80000000) << endl;
    cout << Number1(0xffffffff) << endl;
    cout << Number2(0x7fffffff
 
) << endl;
    cout << Number2(0x80000000) << endl;
    cout << Number2(0xffffffff) << endl;
    system("pause");
    return 0;
}