Write a program that will input letter grades (A, B, C, D, F), the number of which is input by the user (a maximum of 50 grades). The grades will be read into an array. A function will be called five times (once for each letter grade) and will return the total number of grades in that category. The input to the function will include the array, number of elements in the array and the letter category (A, B, C, D or F). The pro- gram will print the number of grades that are A, B, etc.

In Java:

import java.util.*;

public class Main{

public static int countgrades(char[]letterGrades,char Grade, int lent){

    int count = 0;

    for(int i =0;i<lent;i++){

        if(letterGrades[i]==Grade){

            count++;         }     }

    return count;

}

public static void main(String[] args) {

 Scanner input = new Scanner(System.in);

 int lent;

 System.out.print("Length: ");

 lent = input.nextInt();

 while(lent >30 || lent<1){

     System.out.print("Invalid input\nLength: ");

     lent = input.nextInt();  }

 char[] letterGrades = new char[lent];

 for(int i  =0; i<lent;i++){

     letterGrades[i] = input.next().charAt(0);

 }

 char[] letters = {'A','B','C','D','F'};

 for(char i:letters){

     System.out.println(i+": "+countgrades(letterGrades,i, lent));

 }

}

}

Explanation:

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