问题是，math.h不工作，所以我必须使用cmath。第二，不是整数，而是浮点数或双精度。

The problem is that the math.h doesn't work, so I have to use cmath. Second, not int, but float or double.

代码：

#include <iostream>
#include <cmath>

using namespace std;

int main()
{

    float t1 = 3, t2 = 4, t3 = 5;

    if (pow(t1, 2) + pow(t2, 2) == pow(t3, 2)) {
        cout << "PT" << endl;
    }
    else {
        cout << pow(t1, 2) + pow(t2, 2) << endl;
        cout << pow(t3, 2) << endl;
    }

}