为什么结果会不同？请大神指教

Question

#include
using namespace std;

int main() {
unsigned int x;
unsigned int y = 100;
unsigned int z = 50;
x = y - z;
cout << "Difference is: " << x << endl;
x = z - y;
cout << "\nNow difference is: " << x << endl;
return 0;
}

Answer 1

计算机内部计算以补码运算。