java - 如何让这个循环10次然后结束

Question

创建一个程序，根据选择的问题类型询问 10 个问题。我怎样才能让这个问题只问10次，并在每个问题后显示它是错还是对？

我尝试使用 for(int i=1;i<=10;i++) 但它不会显示每个答案后的答案是对还是错

{
    int userType, probType, level, op1=0, op2=0, correctAnswer, studentAnswer=0, numCorrect=0;
    Scanner input = new Scanner(System.in);
    boolean playAgain;

    System.out.println("Problem Type 1 is sum, 2 is difference, 3 is product, 4 is quotient, and 5 is random. What problem type do you want?");
    probType = input.nextInt();
    System.out.println("You selected " + probType + ". What level from 1 to 3 do you want to play? ");
    level = input.nextInt();
    while(probType == 1){
        op1 = (int)(Math.random() * 9);
        op2 = (int)(Math.random() * 9);
    System.out.println("What is " + op1 + "+" + op2 + "?");
        studentAnswer = input.nextInt();
        }if(studentAnswer == op1 + op2){
            System.out.println(studentAnswer + " is correct");
            numCorrect++;
        }else{
            System.out.println(studentAnswer + " is wrong. The right answer is " + (op1 + op2));
        }
    }
}

Answer 1

我添加了静态变量，它是您希望向用户询问的问题数量(最终 int NUM_PROBLEMS = 10)。

您的 while 循环在 if 语句之前结束。我已将 while 循环的右括号移至末尾，更改了 while 循环 header ，以确保 while 循环在提出 10 个问题时停止，并在每次提出问题时在底部递增 ProblemCount。

{
        int userType, probType, level, op1=0, op2=0, correctAnswer, studentAnswer=0, numCorrect=0, problemCount=1;
        final int NUM_PROBLEMS = 10;
        Scanner input = new Scanner(System.in);
        boolean playAgain;

        System.out.println("Problem Type 1 is sum, 2 is difference, 3 is product, 4 is quotient, and 5 is random. What problem type do you want?");
        probType = input.nextInt();
        System.out.println("You selected " + probType + ". What level from 1 to 3 do you want to play? ");
        level = input.nextInt();

        while(probType == 1 && problemCount <= NUM_PROBLEMS){
            op1 = (int)(Math.random() * 9);
            op2 = (int)(Math.random() * 9);

            System.out.println("What is " + op1 + "+" + op2 + "?");
            studentAnswer = input.nextInt();

            if(studentAnswer == op1 + op2){
                System.out.println(studentAnswer + " is correct");
                numCorrect++;
            }else{
                System.out.println(studentAnswer + " is wrong. The right answer is " + (op1 + op2));
            }
            problemCount++;
        }
}