Question

创建一个程序，该程序将根据选择的问题类型询问10个问题。我如何让这个问题只问10次，并在每个问题后显示其对还是错？

我尝试使用for（int i = 1; i <= 10; i ++），但每次回答正确还是错误后都不会显示

{
    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，它是您要询问用户的问题数量（最终int NUM_PROBLEMS = 10）。

您的while循环在if语句之前结束。我将while循环的结束括号移到了末尾，更改了while循环标题，以确保当有10个问题被问到并且每次问一个问题时在底部递增的problemCount时while循环都停止了。

{
        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++;
        }
}

如何使此循环10次然后结束

1 个答案: