底片不能很好地叠加

代码在这里

#include "stdafx.h"
#include <iostream>
#include <string>
#include <math.h>
using namespace std;
int main ()
{
    cout << 1 + -4 << "n";
    signed int x1; //(x1, ...
    signed int y1; //(x1, y1)...
    signed int x2; //... (x2, ...
    signed int y2; // ... (x2, y2)
    signed int ans1;
    signed int ans2;
    signed int ans3;
    signed int result;
    cout << "X1: ";
    cin >> x1;
    cout << "nY1: ";
    cin >> y1;
    cout << "nX2: ";
    cin >> x2;
    cout << "nY2: ";
    cin >> y2;
    cout << "n(" << x1 << ", " << y1 << "), (" << x2 << ", " << y2 << ")n";
    result = (x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1);
    cout << "X2 - X1 = " << x2 - x1 << "n";
    cout << "Y2 - Y1 = " << y2 - y1 << "n";
    ans1 = x2 - x1;
    ans2 = y2 - y1;
    ans3 = ans1 + ans2;
    cout << ans1 << " + " << ans2 << " = " << ans3;
    cout << result << "n";
    return 0;
}

我一直在尝试为一个简单的方程做一个求解器。简单来说，它是(x2 - x1)(平方)+ (y2 - y1)(平方)这些是不同的数字，想想坐标。(4,3)， (6,2)

问题是，举个例子，当我输入8,6,9,2(结果是(8,6)，(9,2)它会得到错误的答案，而不是我在纸上解决它。我把它做得很好<<这些步骤是有顺序的，题目说1 + -4 = -317。我很困惑，因为这当然不是正确答案。那么到底出了什么问题呢?当我从开始的整数中删除符号时，它会断开。

我使用的是Visual Studio Express 2012，运行Windows 8。