输入一个整数，输出该数二进制表示中1的个数。其中负数用补码表示。

#include "stdafx.h"
#include<iostream>
#include<string>
#include<cctype>
#include <vector>
#include<cstring>
//#include<stdexcept>
#include<exception>
using namespace std;

class Solution {
public:
int  NumberOf1(int n) {
int charNum = sizeof(n);
int flag = n;
int num = 0;

for (int i = 0; i < charNum * 8; i++)
{
if (flag & 1)
num++;
flag = flag >> 1;
}
return num;
}
};

int main()
{
Solution so;
int n;
int num;
while (true)
{
cout << "请输入一个正数: ";
cin >> n;
num = so.NumberOf1(n);
cout << "改数二进制表示中1个数为： " << num << endl;
cout << endl;
}

}