Java 代码简单数学

Question

我被下面代码 3 的解决方案困住了。我需要插入一个简单的数学问题，但在浏览完我的书和类里面的示例视频后我无法解决这个问题。我希望程序询问“8 的 2 次方的答案是什么”，答案是“64”。有谁愿意帮我吗？如果有人能让我开始的话，我可以提出另外两个问题!非常感谢!!金姆

import java.util.Scanner;  //allows for input

public class ASG03 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in); //allows for input

        //Step 1 - Declare and initialize variables
        String candidateName = "";
        String responseE = "";

        int option = 0;
        double score = 0;


        if (score <=85)
            responseE = "Definite";
        else if (score <=70)
            responseE = "Likely";
        else if (score <=60)
            responseE = "Maybe";
        else
            responseE = "No";

        String responseI = "";

        if (score <=85)
            responseI = "Yes";
        else if (score <=70)
            responseI = "Yes";
        else if (score <=60)
            responseI = "Yes";
        else
            responseI = "No";

        //Step 2 -  Process input

        System.out.println("Enter candidate name: ");
        candidateName = input.nextLine();
        System.out.println("Enter score 0 -100: ");
        score = input.nextDouble();
        System.out.println();



        System.out.println("Enter 1 to set employment category ");
        System.out.println("Enter 2 to set interview possibility ");
        System.out.println("Enter 3 to view a sample test question ");
        System.out.println("Enter option now -> ");
        option = input.nextInt();





        //Step 3 and 4 - Process calculations and output
        switch(option)
        {
        case 1:
            System.out.println("You are now setting the employment category...");
            //can use nested if else
            System.out.println("Employment category =  " + responseE);

            break;


        case 2:
            System.out.println("You are now setting the interview possibilities...");
            System.out.println("Interview possibilites = " + responseI);



            break;

        case 3:
            System.out.println("You are now viewing a sample test question...");
            //use random and power from Math library


        default:


        }//end of switch

    }//end of main

}//end of class

Answer 1

当您运行程序时，在main中你将会拥有responseE将始终设置为“确定”。因为:

查看代码流程:

double score = 0;
if (score <=85)
  responseE = "Definite";
else if (score <=70)
...
...

第一个if总是满足，所以它总是会被执行。

此外，即使您评估 responseE读完分数后，您需要再次考虑如何编写条件。注意 if score <= 85然后score <= 70 ....

你应该有这样的东西:

在切换之前:

responseE = getResponse(score);

这是方法 getResponse :

private static String getResponse(double score) {
  if (score <=85 && score >70)
    return "Definite";
  else if (score <=70 && score > 60)
    return "Likely";
  else if (score <=60 && score > 40) //For example..
    return "Maybe";
  return "No";
}

对于您读取输入之后想要评估的其他字段也是如此。