java - 在 Java 中跳出 while 循环

Question

我真的不明白为什么它没有跳出循环。这是我的程序:

public static void main(String[] args) {

    Scanner input = new Scanner (System.in);

    double tution, rate, r, t, realpay, multiply, start;
    start = 0;

    while(start != -1)
    {
        System.out.print("Press 1 to start, -1 to end: ");
        start = input.nextDouble();

        System.out.print("Please enter the current tution fee for the year: ");
        tution = input.nextDouble();

        System.out.print("Enter in the amount of interest: ");
        rate = input.nextDouble();

        r = 1 + rate;

        System.out.print("Please enter the number of years: ");
        t = input.nextDouble();
        multiply = Math.pow(r,t);
        realpay = tution * multiply;

        System.out.println("the cost of your tution fee: " + realpay);

        if (start == -1)
        {
            break;
        }
    }
}

你能告诉我它有什么问题吗？

Answer 1

阅读开始后需要移动break

start = input.nextDouble();
if (start == -1) {
    break;
}

Else 程序将继续并在循环结束时中断，即使您输入了 -1