java - 如何在java中根据用户输入计算百分比

Question

所以基本上我有这个调查程序，我想知道如何计算与“if”语句给出的响应相匹配的已回答问题的百分比。但这个百分比可能会根据用户输入的内容而有所不同。另一件事是我需要将计算百分比的代码放入一个非主方法中，我已经在下面的代码中设置并注释了该方法(标记为非主方法)。我想知道的是如何制定一个公式来考虑所有可能的用户输入(基本上是 1/5、2/5、3/5、4/5 和 5/5，因为调查有 5 个问题)。

import java.util.Scanner;

public class VideogameSurveyFINAL {    
 //non-main method 

   private static void gamerpercentagelikeme (String[] args) {

   int correct
   }   




  //main method below
   public static void main(String[] args) {
  boolean run = true;
  while(run){

     System.out.println ("WELCOME TO THE GRAND SURVEY OF VIDEOGAMES!");
     System.out.println ("");

     Scanner keyboard = new Scanner(System.in);

  //Q1
     System.out.println("Question 1: Do you like Videogames? (Please answer Yes or No)"); 
     String input = keyboard.nextLine(); 
     if  (input.equalsIgnoreCase("Yes")||input.equalsIgnoreCase("Yeah")||input.equalsIgnoreCase("Y")||input.equalsIgnoreCase("YES!"))  { 
        System.out.println("Awesome!");
     }
     else { 
        System.out.println("Wow. You have no sense of fun.");
     } 
  //Q2
     System.out.println ("");
     System.out.println("Question 2: What types of videogames do you play?(Please use abbreviated froms of games such as FPS, MMO, RPG etc)."); 
     String input2 = keyboard.nextLine(); 
     if  (input2.equalsIgnoreCase("Fps"))  { 
        System.out.println("Fantastic! Me too!");
     }
     else { 
        System.out.println("OK, thats cool!My favorite is FPS.");
     } 
  //Q3
     System.out.println ("");
     System.out.println("Question 3:Do you like Singleplayer or Multiplayer games? "); 
     String input3 = keyboard.nextLine(); 
     if  (input3.equalsIgnoreCase("Singleplayer")||input.equalsIgnoreCase("S")||input.equalsIgnoreCase("SP"))  { 
        System.out.println("Me Too!!");
     }
     else { 
        System.out.println("Rad! My favorite is Singleplayer. ");
     }
  //Q4
     System.out.println ("");
     System.out.println("Question 4: What do you like in a videogame"); 
     String input4 = keyboard.nextLine(); 
     if  (input4.equalsIgnoreCase("I dont play games")||input.equalsIgnoreCase("None")||input.equalsIgnoreCase("N"))  { 
        System.out.println("You are sooooo boring.");
     }
     else { 
        System.out.println("Awesome! What I like in a videogame is solid gameplay, great graphics and immersive audio...but most of all, IT HAS TO BE FUN!!");
     } 
  //Q5
     System.out.println ("");
     System.out.println("Question 5: What is your ALL-TIME favorite videogame?");
     String input5 = keyboard.nextLine(); 
     if  (input5.equalsIgnoreCase("Skyrim"))  { 
        System.out.println("Really?! ME TOO!");
     }
     else { 
        System.out.println("Great! My personal favorite is SKYRIM!");
     } 
     System.out.println ("");
     System.out.println("THANK YOU FOR TAKING THE GRAND SURVEY OF VIDEOGAMES!");
     System.out.println ("");
     System.out.println ("Would you like to take the survey again? (Please answer with Yes or No: Case sensitive)");
     String input6 = keyboard.nextLine(); 
     if  (input6.equalsIgnoreCase("No"))  { 
        break;
     }
     else 
     { 
        System.out.println("Okay! The Survey will restart shortly.");
        System.out.println ("");
        System.out.println ("");




     }
  }

}}

Answer 1

在public static void main(String[] args) {内部声明一个公共(public)变量，例如:

int questionsCorrect = 0; //this is where we will keep track of the questions 'correct'

现在，每当我们答对一个问题时，我们就会增加这个计数。在 if(condition...) 语句内部，我们将执行此增量。

例如:

if  (input.equalsIgnoreCase("Yes")||input.equalsIgnoreCase("Yeah")||input.equalsIgnoreCase("Y")||input.equalsIgnoreCase("YES!"))  { 
    System.out.println("Awesome!");
    questionsCorrect++; //increment number of questions correct by 1
 }

对调查中的每个问题都执行此操作。

现在对于百分比...我相信更改 private static void gamerpercentagelikeme (String[] args) 方法的参数以获取正确的问题和总问题是明智的，然后返回小数形式的百分比。

private static double gamerpercentagelikeme (int correct, int total){
     return correct/total;
}

现在，当我们想要显示答案时，我们可以调用:

double results = gamerpercentagelikeme(questionsCorrect, TOTAL_QUESTIONS); //note: declare TOTAL_QUESTIONS before using it.
double percentageLikeMe = results * 100;
System.out.println(percentageLikeME + "% like me.);

希望这有帮助。