Question

Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the average test score. Design the following functions in the program:

• calcAverage—This function should accept five test scores as arguments and return the average of the scores.

• determineGrade—This function should accept a test score as an argument and return a letter grade for the score (as a String), based on the following grading scale:

• Round the average to one digit to the right of the decimal point. This should be done in the main() procedure.
• The function determine_grade():
  • Should only take one argument, and thus only one parameter. That argument should be a single numeric test score.
  • Should return the single letter grade that corresponds to the numeric test score that was passed in as an argument.
• The function calc_average():
  • Should take five arguments, and thus five parameters. There should be one argument for each of the five test scores.
  • Should return the average all five test scores.
• Do not put your print statements inside of your functions. Instead your functions should return the calculated value to the calling procedure (probably main()), and the calling procedure will print the results.

Answer 1

import java.util.Scanner;

public class Scores {
  
   public static String determine_grade(double score){
       String grade = "invalid";
      
if(score<=30){
   grade = "F";
}
else if(score<=40){
   grade = "D";
}
else if(score<=50){
   grade = "C";
}  
  
else if(score<=70){
   grade = "B";
}
else if(score>70){
   grade = "A";
}
  
       return grade;
   }
  
  
   public static double calc_average(double sc1, double sc2, double sc3, double sc4, double sc5){
       return (sc1+sc2+sc3+sc4+sc5)/5;
   }
  
  
   public static void main(String[] args) {
      
double s1,s2,s3,s4,s5;
  
//inputting scores
   Scanner input = new Scanner(System.in);
   System.out.printf("Enter Score 1: ");
   s1 = input.nextDouble();
   System.out.printf("Enter Score 2: ");
   s2 = input.nextDouble();
   System.out.printf("Enter Score 3: ");
   s3 = input.nextDouble();
   System.out.printf("Enter Score 4: ");
   s4 = input.nextDouble();
   System.out.printf("Enter Score 5: ");
   s5 = input.nextDouble();
   input.close();
  
   System.out.println("GRADES:");
   System.out.println("------------------------------");

   System.out.println("Grade is "+ determine_grade(s1)+" for score of "+ s1);  
   System.out.println("Grade is "+ determine_grade(s2)+" for score of "+ s2);
   System.out.println("Grade is "+ determine_grade(s3)+" for score of "+ s3);
   System.out.println("Grade is "+ determine_grade(s4)+" for score of "+ s4);
   System.out.println("Grade is "+ determine_grade(s5)+" for score of "+ s5);
  
  
   System.out.println("---------------------------");
   System.out.println("AVERAGE: " + calc_average(s1,s2,s3,s4,s5));
  

}
  
}

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