c++ - 为什么这样做-仅接受pLife条件？

循环起作用的唯一方法是玩家耗尽生命。该游戏应该允许玩家回答数学问题，他们一直回答直到他们或魔术师的生命耗尽为止。所以在do while循环中，while仅在pLife用完并且完全忽略eLife时才起作用，为什么呢？

do
{
    int Number = rand() % 20 + 1;       //Desides the random number that will be used in the program
    int aNumber = rand() % 20 + 1;
    int rng = rand() % 3 + 1;
    cout <<"Player Life Total = " <<pLife <<endl;
    cout <<"Mathmagican Life Total = " <<eLife <<endl;

    if (rng == 1)
    {
        cout <<"What is " <<Number <<"X" << aNumber <<"?\n\n";
        cin >> answer;
            if (answer == Number * aNumber)
            {
                cout <<"What!!! How is that possible you deflected my attack!\n\n";
                cout <<"Ahh it hit me!! you hit me with my own magic! Thats not fair!\n\n";
                eLife = eLife- 1;
            }
            else if (answer > Number * aNumber, answer < Number * aNumber)
            {
                cout <<"I told you that you couldn't defeat me!\n\n";
                cout <<"Now die!";
                pLife = pLife - 1;
            }
    }
    else if (rng == 2)
    {
        cout <<"What is " <<Number <<"-" << aNumber <<"?\n\n";
        cin >> answer;
            if (answer == Number - aNumber)
            {
                cout <<"What!!! How is that possible you deflected my attack!\n\n";
                cout <<"Ahh it hit me!! you hit me with my own magic! Thats not fair!\n\n";
                eLife = eLife- 1;
            }
            else if (answer > Number - aNumber, answer < Number - aNumber)
            {
                cout <<"I told you that you couldn't defeat me!\n\n";
                cout <<"Now die!";
                pLife = pLife - 1;
            }
    }
    else if (rng == 3)
    {
        cout <<"What is " <<Number <<"+" << aNumber <<"?\n\n";
        cin >> answer;
            if (answer == Number + aNumber)
            {
                cout <<"What!!! How is that possible you deflected my attack!\n\n";
                cout <<"Ahh it hit me!! you hit me with my own magic! Thats not fair!\n\n";
                eLife = eLife- 1;
            }
            else if (answer > Number + aNumber, answer < Number + aNumber)
            {
                cout <<"I told you that you couldn't defeat me!\n\n";
                cout <<"Now die!";
                pLife = pLife - 1;
            }
    }
}while (eLife > 0, pLife > 0);

    if (eLife == 0)
    {
        cout <<"Oh no! I cant belive it... you... actualy... defeated me?!\n\n";
        cout <<"NO!!! CURSE YOU!!!";
        cout <<"You've Won!\n\n";
        system ("pause");
        return 0;
    }
    else if (pLife == 0)
    {
        cout <<"MWAHAHAHAHAHA!!!!! I told you i would win!\n\n";
        cout <<"Game over";
        system ("pause");
        return 0;
    }

}

最佳答案

将评估逗号分隔表达式中的每个单个表达式，并且它们会发生副作用。但是，整个逗号分隔的表达式的值只是最右边的表达式的结果。因此，仅当pLife > 0返回true时，while条件的评估结果才为true。

若要更正此问题，请使用布尔运算符（例如&&或||）将其更改为单个表达式