当循环应该只运行一次时，执行两次while循环(C++）

朋友。我有个问题。

问题：计算机必须从36个字符串的数组中随机选择一个字符串。如果它偶然选择字符串#34或#35（最后两个），它必须从同一数组中再抽取两个随机字符串。我尝试了一个临时解决方案，它"几乎"有效（请参阅下面的代码）。

随机化工作得很好，称为srand in main（）。有一个强制的"x2"绘制（出于测试原因），所以计算机又绘制了两个字符串。这两个新的随机选择不是"x2"，但循环仍然会再次启动——但只是又一次！这一次，计算机又选择了两个"chits"，它们也不是"x2"，所以，正如预期的那样，它返回"chits have draw"语句，函数终止。为什么同一个代码运行两次，结果相同，但if/else行为不同？事先非常感谢。

        string mortalityCalc ()
{
        string mortalityChits[36] = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","-","-","-","-","x2","x2"};
        int mortalityResult;
        // mortalityResult = rand() %36;
        mortalityResult = 35; // for testing only. Delete afterwards.
        string drawnChit = mortalityChits[mortalityResult];
        string drawnChit1;
        string drawnChit2;
        if (drawnChit != "-" && drawnChit != "x2")
        {
            string returnText = string("The computer has drawn the chit '") + drawnChit + "'.";
            return returnText;
        }
        else if (drawnChit == "-")
        {
            string returnText = string("The computer has drawn the chit '") + drawnChit + "'. No senators died this year.";
            return returnText;
        }
        do
        {
            cout << "The computer has drawn the 'x2' chit." << endl;
            cout << "Two more chits will be drawn.n" << endl;
            mortalityResult = rand() %36;
            drawnChit1 = mortalityChits[mortalityResult];
            cout << "The first draw is the chit '" << drawnChit1 << "'. ";
            mortalityResult = rand() %36;
            drawnChit2 = mortalityChits[mortalityResult];
            cout << "The second draw is the chit '" << drawnChit2 << "'." << endl;
        } while (drawnChit1 == "x2" || drawnChit2 == "x2");
        return "The mortality chits have been drawn. The corresponding senators are dead.";
}

UPDATE：尝试将此代码与程序的其余部分隔离运行，其行为与预期一致。所以我想发布之前的内容很重要：

cout << "If you are a lazy bastard, the computer can pick one senator randomly for you.nAre you a lazy bastard? [y/n]" << endl;
        string lazyBastard;
        cin >> lazyBastard;
        cout << endl;
        if (lazyBastard == "y" || lazyBastard == "Y" || lazyBastard == "yes" || lazyBastard == "YES" || lazyBastard == "Yes")
        {
            mortalityCalc ();
            cout << mortalityCalc () << endl;
            cout << "Very well. Now, imminent wars become active (Only one of each match)." << endl;
            cout << "Get ready for the next phase." << endl;

通过阅读这里的其他一些问题，我的猜测是，cin在某种程度上扰乱了循环行为，尽管它们不相关，并且循环的语句或条件中没有任何用户输入。这可能吗？如果是，为什么以及如何补救？

再次感谢。