筛选可疑密码c++/c语言

Question

情报小组截获了一个4位数密码，最新情报：个位数和千位数之和减去十位数和百位数之和的结果是一个正数，请你帮忙选出密码

Answer 1

```c++
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int i,gw,sw,bw,qw;
    for (int i = 999; i < 10000; i++)
    {
        gw = i % 10;
        sw = i % 100 / 10;
        bw = i / 100 % 10;
        qw = i / 1000;
        if (gw + qw - sw - bw > 0)
        {
            cout << qw << bw << sw << gw << endl;
        }
    }


}

```