C++ While 循环不会重复

Question

我试图让程序中的 WHILE 循环重复。我已经在这里待了大约 4 个小时，所以也许我只是错过了一些东西。

无论我输入什么，我都无法让循环重复。此外，如果我在提示中输入多个字符，那么它会跳过所有 7 个后续循环。

然后，更好的是，当输入内容时，最后的变量甚至不会改变，希望你能帮助我解决上面列出的所有问题(越简单越好)。但此时我只需要一个。

    cout << "Welcome. Input anything to start the sales reporting process.\n\n";
cin >> start; **//If I enter more than one character here it skips my other loops**
if (start == start)
{
    cout << "\n\nPlease enter the amount of each sale for Darwin when prompted, only enter one at a time.\n";
    cout << "When you are finished entering sales, input a '1'.\n\n";
    cout << "Enter a sale for Darwin: ";
    cin >> darwinSale;
    cout << endl << endl;
    while(darwinSale =! 1)
    {
        cout << "Enter a sale for Darwin: ";
        cin >> darwinSale;
        if (darwinSale <= 50999)
            darwinCom = darwinSale * 0.04;
        if (darwinSale >= 51000 and darwinSale <= 125999)
            darwinCom = darwinSale * 0.05;
        if (darwinSale >= 126000 and darwinSale <= 200999)
            darwinCom = darwinSale * 0.06;
        if (darwinSale >= 201000)
            darwinCom = darwinSale * 0.07;
        darwinComTotal = darwinComTotal + darwinCom;
        darwinTotal = darwinSale + darwinTotal;
        cout << endl << endl;
    }

Answer 1

在你的 while 条件下，你实际上是在检查:

while(drawinSale = !1)

并且 !1 检查 1 == NULL 是否返回 0

您应该改为执行以下操作:

while(drawinSale != 1)