Question

它是这样的：Project4Appclass的目的是为儿童创建一个数学游戏，以加强他们的加法和减法技能。为了让游戏允许学生获得足够的练习，游戏将向学生提出10个问题。如果学生得到正确的前10个问题，游戏应该结束。否则，游戏应继续进行，直到发生以下两种情况之一：1）学生正确答案的百分比至少达到85％，或2）学生已完成20个问题。当游戏结束时，应该告诉学生他/她正确和不正确的添加问题的数量以及他/她得到的正确和不正确的减法问题的数量。它还应给出一个分数，即他/她得到的问题的百分比。（并且不使用“休息”）

package proj3;
import java.util.Random;


public class Question {

private int operand1;
private int operand2;
private char operator;

/**
 * <p> Name: main method </p>
 * 
 */
public Question()
{
    Random rand = new Random();
    boolean random = rand.nextBoolean();

    if(rand.nextBoolean())
    {
        operator = '+';
        operand1 = rand.nextInt(13);
        operand2 = rand.nextInt(13);
    }
    else 
    {
        operator = '-';
        operand1 = rand.nextInt(13 - 6) + 6;
        operand2 = rand.nextInt((operand1 - 0) + 1) + 0;
    }


}
/**
 * getOperand1 method - returns what's stored in the instance variable value
 * @return the state of the instance variable value
 */
public int getOperand1()
{
    return operand1;
}
/**
 * getOperand2 method - returns what's stored in the instance variable value
 * @return the state of the instance variable value
 */
public int getOperand2()
{
    return operand2;
}
/**
 * getOperator method - returns what's stored in the instance variable value
 * @return the state of the instance variable value
 */
public char getOperator()
{
    return operator;
}


 /**
 * toString method - this method returns the state of the Question object
 * @return a reference to a String object that contains 
 * the operands and the operator 
 */
public String toString()
{
    String question;
    question = operand1 + " " + operator + " " + operand2 + " " + "=";
    return question;


}
 /**
 * determineAnswer method - this method returns the state of the card object
 * @return a reference to a Question object that contains the answer to 
 * a random question.
 */
public int determineAnswer()
{
    if(operator == '+')
        return operand1 + operand2;
    else
        return operand1 - operand2;
}
}

这就是Project4App目前的样子（坚持）

 public static void main(String [] args)
{
    Scanner scan = new Scanner(System.in);
    int percentage = 0;
    int questions = 0;
    while( questions > 10 && questions < 20 && percentage >= 85.0)
    {
        Question q = new Question();
        System.out.println("What is the result?");
        System.out.println(q);
        int answer = scan.nextInt(); 
        if(answer == q.determineAnswer())
            System.out.println("Congratulations, you got it correct!");

        else
            System.out.println("The correct answer for " + q + " is " + q.determineAnswer());

    }



    /**for(int i =0; i <= 20; i++)
    {
        Question q = new Question();
        System.out.println("What is the result?");
        System.out.println(q);
        int answer = scan.nextInt();


        if(answer == q.determineAnswer())
        {
            System.out.println("Congratulations, you got it correct!");

        }
        else
            System.out.println("The correct answer for " + q + " is " + q.determineAnswer());
    }
    **/
}

}

如何继续，我们将不胜感激。

Answer 1

我没有测试

 boolean isOver = false;
 while( !isOver ){
    questions++;
    Question q = new Question();
    System.out.println("What is the result?");
    System.out.println(q);
    int answer = scan.nextInt(); 
    if(answer == q.determineAnswer())
        System.out.println("Congratulations, you got it correct!");
    else
        System.out.println("The correct answer for " + q + " is "+ q.determineAnswer());

    if( (questions > 10 && percentage >= 85.0) || questions == 20){
        isOver = true;
    }
}

添加和减去扭曲

1 个答案: