Question

我正在写经典的“猜猜我的号码”节目。

我似乎不明白为什么即使在我写了“Success”并进入默认路由之后，while循环也不会停止工作。

int xRan;

void rdm(int to, int from){
    srand(time(NULL));
    xRan = rand()%to+from;
}

void iGuess(){
    string b;
    int tries = 1;

    cout <<  "Think of a number between 1 and 100" << endl;
    rdm(100, 1);

    while(b != "Success" || b != "success"){

        cout << "is your number higher or lower than  " << xRan << ". (attempt #" << tries << ")" <<  endl;
        cout << "If I guessed your number, please type 'Success' " << endl;
        cout << "-->";
        cin >> b;

        if(b == "Lower" || b == "lower"){
            rdm(xRan, 1);
            tries++;

        }else if(b == "Higher" || b == "higher"){
            rdm(100, xRan);
            tries++;

        }else{

        cout << "This is not a valid choice." << endl;

        }

    }
    cout << "I'm so good! I did it in " << tries << "attempts!" << endl;
}

Answer 1

你永远不会离开你的for循环，因为你正在检查它是否是＆＃34;成功＆＃34; 或＆＃34;成功＆＃34;。任何一个都可以是真的并进入循环。因此，无论您是否使用大写字母输入，其中一个都是真的。而是写

while(b != "Success" && b != "success")

为什么检查字符串匹配的OR条件总是返回true

1 个答案: