Question

Write a java program to read a list of exam grades given as int's in the range of 0 to 100. Your program will display the total number of grades and the number of grades in each letter-grade category as follows:

A

93 <= grade <= 100

A-

90 <= grade < 93

B+

87 <= grade < 90

B

83 <= grade < 87

B-

80 <= grade < 83

C+

77 <= grade < 80

C

73 <= grade < 77

C-

70 <= grade < 73

D

60 <= grade < 70

F

0 <= grade < 60

Use a negative number as a sentinel value to indicate the end of the input. (The negative value is used only to end the loop, do not use it in your calculations.)

Each time you prompt the user to enter a grade you will print:

Enter a grade:

  

For example, if the input is:

98 95 87 86 83 92 85 78 74 72 81 71 69 63 50 43 -1

  

The output would be:

Total number of grades = 16

Number of A's = 2

Number of A-'s = 1

Number of B+'s = 1

Number of B's = 3

Number of B-'s = 1

Number of C+'s = 1

Number of C's = 1

Number of C-'s = 2

Number of D's = 2

Number of F's = 2

  

Please note that your class should be named Grades

Answer 1

Code:

import java.util.Scanner;   //importing scanner class for input purpose
public class Grades
{
   public static void main (String args[])
       {
           Scanner input=new Scanner(System.in);   
           int countGrades[]=new int []{0,0,0,0,0,0,0,0,0,0}; //declare array and intialize each with zero
           System.out.print("Enter a grade:");
           int grade=input.nextInt();   //asking user to enter the grade
           int total_count=0;
           while (grade>0)
               {
               total_count++;
               if (grade>=93 && grade<= 100)                   //based on the marks increment the particular index count
                   countGrades[0]++;
               else if (grade>=90 && grade < 93)
                   countGrades[1]++;
               else if (grade >=87 && grade < 90)
                   countGrades[2]++;
               else if (grade>=83 && grade < 87)
                   countGrades[3]++;
               else if (grade>=80 && grade < 83)
                   countGrades[4]++;
               else if (grade>=77 && grade < 80)
                   countGrades[5]++;
               else if (grade>=73 && grade < 77)
                   countGrades[6]++;
               else if (grade>=70 && grade < 73)
                   countGrades[7]++;
               else if (grade>=60 && grade < 70)
                   countGrades[8]++;
               else if (grade>=0 && grade < 60 )
                   countGrades[9]++;
               System.out.print("Enter a grade:");
               grade=input.nextInt();             //take input from user untill user enters negative
               }
           System.out.println("Total number of grades = " +total_count); //finally printing total_count
           System.out.println("Number of A's = " +countGrades[0]);
           System.out.println("Number of A-'s = " +countGrades[1]);
           System.out.println("Number of B+'s = " +countGrades[2]);
           System.out.println("Number of B's = " +countGrades[3]);      //printing each grade count from countGrades() Array
           System.out.println("Number of B-'s = " +countGrades[4]);
           System.out.println("Number of C+'s = " +countGrades[5]);
           System.out.println("Number of C's = " +countGrades[6]);
           System.out.println("Number of C-'s = " +countGrades[7]);
           System.out.println("Number of D's = " +countGrades[8]);
           System.out.println("Number of F's = " +countGrades[9]);
   }
}

Code and Output:

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