java - 考试成绩和Java成绩

Question

我不断收到以下6个错误:

----jGRASP exec: javac -g TestScoresAndGrade.java

TestScoresAndGrade.java: 41: incompatible types

found: char

required: java.lang.String

grade = '?'; TestScoresAndGrade.java: 43: incompatible types

found : char

required: java.lang.String

grade = 'A'; TestScoresAndGrade.java: 45: incompatible types

found : char

required: java.lang.String

grade = 'B';

TestScoresAndGrade.java: 47: incompatible types

found : char

required: java.lang.String

grade = 'C'; TestScoresAndGrade.java: 49: incompatible types

found : char

required: java.lang.String

grade = 'D'; TestScoresAndGrade.java: 51: incompatible types

found : char

required: java.lang.String

grade = 'F'; 6 errors

----jGRASP wedge: exit code for process is 1. ----jGRASP: operation complete.

从

import java.util.Scanner;

public class TestScoresAndGrade
{
   public static void main(String[] args)
   {

    Scanner keyboard = new Scanner(System.in); 

      int score1;
      int score2;
      int score3;
      double ScoreAvg;
      String grade;


      System.out.print("Enter the first score: ");
                score1 = keyboard.nextInt();

        System.out.print("Enter the second score: ");
                score2 = keyboard.nextInt();

       System.out.print("Enter the third score: ");
                score3 = keyboard.nextInt();

        ScoreAvg = (score1 + score2 + score3)/ 3.0;
      ScoreAvg = Math.round(ScoreAvg);

        if(ScoreAvg > 100)
             grade = '?';
        else if(ScoreAvg >= 90)
         grade = 'A';
      else if(ScoreAvg >= 80)
         grade = 'B';
        else if(ScoreAvg >= 70)
         grade = 'C';
      else if(ScoreAvg >= 60)
         grade = 'D';
      else
         grade = 'F';

      System.out.println("Average score: " + ScoreAvg + " " + grade + "\n");
   }
}

Answer 1

使用双引号代替单引号作为您的成绩值。尝试

import java.util.Scanner;

public class TestScoresAndGrade
{
   public static void main(String[] args)
   {

    Scanner keyboard = new Scanner(System.in); 

      int score1;
      int score2;
      int score3;
      double ScoreAvg;
      String grade;


      System.out.print("Enter the first score: ");
                score1 = keyboard.nextInt();

        System.out.print("Enter the second score: ");
                score2 = keyboard.nextInt();

       System.out.print("Enter the third score: ");
                score3 = keyboard.nextInt();

        ScoreAvg = (score1 + score2 + score3)/ 3.0;
      ScoreAvg = Math.round(ScoreAvg);

        if(ScoreAvg > 100)
             grade = "?";
        else if(ScoreAvg >= 90)
         grade = "A";
      else if(ScoreAvg >= 80)
         grade = "B";
        else if(ScoreAvg >= 70)
         grade = "C";
      else if(ScoreAvg >= 60)
         grade = "D";
      else
         grade = "F";

      System.out.println("Average score: " + ScoreAvg + " " + grade + "\n");
   }
}

这是因为成绩是 String而不是 char。 “”表示 String，“”表示 char