@[achjuncool](/user/604622) 那这个是在你的那基础上改的
```cpp
while(x != -1 && y != -1 && z != -1){
cout << "w(" << x << ", " << y << ", " << z << ") = ";
if(x > 20) x = 21;
if(y > 20) y = 21;
if(z > 20) z = 21;
if(x < 0) x = 0;
if(y < 0) y = 0;
if(z < 0) z = 0;
cout << func(x, y, z) << endl;
cin >> x >> y >> z;
}
```
by _maojun_ @ 2022-06-19 07:31:54