java - 限制重复加法测验 - While 循环 - Java

Question

我正在尝试使用 Java 进行编码，并从基本的重复加法测验开始。

重复加法直到输入正确答案效果很好，但是，当我尝试将其限制为 3 次试验时，它不会在 3 次停止，而是进行 4 次试验，如下所示，

import java.util.Scanner;

public class RepeatAdditionQuiz {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    int number1 = (int) (Math.random() * 10);
    int number2 = (int) (Math.random() * 10);

    Scanner input = new Scanner(System.in);
    System.out.print("What is " + number1  + " + " + number2 + " : " );
    int answer = input.nextInt();
    int count = 0;
    while(count < 3) {

        if (number1 + number2 != answer) {
            System.out.print("Try again, What is " + number1  + " + " + number2 + " : " );
            answer = input.nextInt();
        }
        else
            System.out.println("You're correct ");

        count ++;
    }
    System.out.println("Your trails ended ");

}

}

这是我的输出，

What is 1 + 2 : 8
Try again, What is 1 + 2 : 6
Try again, What is 1 + 2 : 9
Try again, What is 1 + 2 : 9
Your trails ended 

正如你所看到的，我有四个轨迹，第一个轨迹。当我尝试在 while 循环(打印 What is 1 + 2 :)之前删除第一个用户输入时，我在控制台中看不到任何内容。我怎样才能将其限制为3？

在python中我可以做这样的事情，

from random import randint

number1 = randint(0,9)
number2 = randint(0,9)

answer = number1 + number2
count = 0
while count < 3:
    print(number1, "+", number2)
    user_answer = int(input("What is number1  + number2: "))
    if answer == user_answer:
        print("yes, you're right")
        break
    else:
        print("You're wrong, please enter again")
    count +=1
print("Sorry, all trials are done! ")

我得到这样的输出，正好三个路径(每次我输入错误的答案)，

8 + 5
What is number1  + number2: 16
You're wrong, please enter again
8 + 5
What is number1  + number2: 18
You're wrong, please enter again
8 + 5
What is number1  + number2: 18
You're wrong, please enter again
Sorry, all trials are done! 

我在java中犯了什么错误？在 while 循环中是否有更好的方法？任何建议将不胜感激。

Answer 1

在这种情况下我更喜欢使用 do-while 循环

import java.util.Scanner;

public class RepeatAdditionQuiz {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    int number1 = (int) (Math.random() * 10);
    int number2 = (int) (Math.random() * 10);

    Scanner input = new Scanner(System.in);
    System.out.print("What is " + number1 + " + " + number2 + " : ");
    int answer = input.nextInt();
    int count = 1;
    do {

        if (number1 + number2 != answer) {
            System.out.print("Try again, What is " + number1 + " + " + number2 + " : ");
            answer = input.nextInt();
        } else{
            System.out.println("You're correct ");
            break;
        }
        count++;
    } while (count < 3);
    System.out.println("Your trails ended ");

}

}

在此我将计数初始化为 1，因为我们已经在实例化时提供了答案输入。