编写一个生成五个问题的Java程序，并在学生回答完所有五个问题后报告正确答案的数量

Question

我是java的新手，我正在尝试编写一个代码，显示他们正确的问题数量，而不是他们每个人都正确。当我尝试运行它时，我无法显示它们正确的问题数量。例如，我希望它说'＃34;你有5个问题中的4个正确！＆＃34;，取决于他们有多少正确。这就是我到目前为止所做的：

import java.util.Scanner;

public class Addition {

   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      int count = 0;
      while (count < 5){
         int number1 = (int)(Math.random() * 100);
         int number2 = (int)(Math.random() * 100);
         System.out.println("What is " + number1 + " + " + number2 + "?");
         count++;
         int answer = number1 + number2;
         int guess = sc.nextInt();
         boolean correct = guess == answer;
         if (guess == answer){
         }      
         System.out.println("You got " + correct + " correct");
      }     
   }
}

Answer 1

您的逻辑需要稍作修改。

int correctAnswer = 0; // this is a new variable you have to introduce before  while (count < 5){

if (guess == answer){
    correctAnswer++;
}

// This line should be outside of while loop as well..
System.out.println("You got " + correctAnswer + " out of " + count + " questions correct");

Answer 2

您的代码中存在两个问题： （1）没有正确答案的计数; （2）完成后不打印。 您做在测试过程中有打印，但那不是您说要打印的时候。尝试这两个更改：在if语句中计数并在循环之后打印。

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int count = 0;
    while (count < 5){
        ... 
        boolean correct = guess == answer;
        if (guess == answer){
             correct++;
        }
    }       
    System.out.println("You got " + correct + " out of " + count " questions correct");
}