尝试抓住一个循环 [英] try catch in a do while loop

问题描述

程序要求用户输入double num 1和double num 2
，如果有异常，我希望它再次询问num 1和num 2的输入

The program asks for the user input for the double num 1 and double num 2 and if there is an exception I want it to ask again for the input of num 1 and num 2

public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);
    double num1, num2;
    int error = 0;
    int text;
    System.out.print("Enter 4 ");
        text = sc.nextInt();

    do{

        try{

    if(text == 4){
            System.out.print("Enter number 1: ");
            num1 = sc.nextDouble();
            System.out.print("Enter number 2: ");
            num2 = sc.nextDouble();
            double quotient = num1/num2;
            System.out.println("The Quotient of "+num1 + "/" +num2+ " = "+quotient);
            }
        }catch(Exception ex){ 
            System.out.println("You've entered wrong input");
                error = 1;
        }                                  

          }while(error == 1);
}

然后当我尝试代码，如果它会通过输入字符串捕获异常num1或num2我有这个无限循环：
输入数字1：输入错误的输入
输入数字1：输入错误输入
输入编号1：输入错误输入
输入编号1：输入错误输入
输入编号1：输入错误输入


then when I try the code if it will catch the exceptions by inputing string in the num1 or num 2 I'm having this infinite loop : Enter number 1: You've entered wrong input Enter number 1: You've entered wrong input Enter number 1: You've entered wrong input Enter number 1: You've entered wrong input Enter number 1: You've entered wrong input

推荐答案

您需要重新设置错误 p>

You need to reset the error variable inside the loop

do {
    error = 0;
    //...
} while(error == 1);

这篇关于尝试抓住一个循环的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！