Question

我刚刚做了一个简单的数学导师游戏，但我似乎无法弄清楚如何用用户输入打破它。这是我到目前为止得到的任何帮助表示赞赏。谢谢。 hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

import java.util.Scanner;
public class HomeWork{

public static void main(String[] args)  {

while (true) 
{ 


     Scanner console =new Scanner(System.in);  // create object for input


     double correctAnswer;

     double userResponse;

     String end = "stop";

    int n1 = (int)(10 * Math.random() + 1);

    int n2 = (int)(10 * Math.random() + 1);


    int operator = (int) (4 * Math.random() + 1);

    if  (operator == 1){              

        correctAnswer = n1 + n2;

        System.out.println("What is " + n1 +    " + "    + n2  + " ?");
 } else if ( operator == 2){      

        correctAnswer = n1 - n2;

        System.out.println("What is " + n1 +    " - "   + n2 + " ?");

    }  else if ( operator == 3) {  

    correctAnswer = n1 * n2;

        System.out.println("What is " + n1 +    " * "   + n2 + " ?");

    }   else {   

         correctAnswer = n1 / n2;

        System.out.println("What is " + n1 +    " / "   + n2 + " ?");

    }                    





    userResponse = console.nextDouble();





    if (userResponse == correctAnswer){
        System.out.println("You got the correct answer!");
        } else {

            System.out.println("Sorry but the correct answer is:" + correctAnswer);



        }
    if(end = console.nextString()){
       break;
       }  
    }
 }
}

Answer 1

您不能使用=运算符（用于为变量赋值）来比较字符串值，而是需要使用equals()方法来比较字符串，如下所示：

if(end.equals(console.nextString())){
  break;
}

另外，请注意，您甚至无法使用==运算符来比较字符串值，即您只能使用.equals()，如上所示。

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1 个答案: