c++ - while循环的两个条件。我的错误是什么？

Question

我有一个问题。这里的一切似乎都工作正常，除了以下行:

} while (OneMoreTime != 'y' || OneMoreTime != 'n'); 

完整代码；

#include <iostream>
using namespace std;


int main()
{
int ARRAY_LENGTH = 5;
int MyArray[ARRAY_LENGTH] = {1, 2, 3, 4, 5};

cout << "Values in the array: " << ARRAY_LENGTH << endl;

for (char OneMoreTime = '\0'; OneMoreTime = 'n'; )
{

    int WhichNumber = ARRAY_LENGTH;
    do  
    {
        cout << "What numbers from the array do you want to see, counting backwards? ";     
        cin >> WhichNumber;
    } while ((WhichNumber > ARRAY_LENGTH) || (WhichNumber <= 0));


    //calculating the correct position in the array (from start)
    int Number2Print = ARRAY_LENGTH - WhichNumber;


    //printing
    cout << "The number is: " << MyArray[Number2Print] << endl;


    //continue?
    do
    {
        cout << "One more time? (y/n) ";
        cin >> OneMoreTime;
    } while (OneMoreTime != 'y' || OneMoreTime != 'n');

}

return 0;
}

我得到的是它在第一次成功打印后不断询问“再来一次？(y/n)”。如果我只使用一个条件，它将起作用(但这还不够)。

Answer 1

该条件将始终为真，因为 OneMoreTime 不能同时等于 n 和 y。您可能的意思是使用 && (和)

while (OneMoreTime != 'y' && OneMoreTime != 'n');