Question

Write a program that prompts the user for student grades, calculates and displays the average grade in the class. The user should enter a character to stop providing values.

Answer 1

Code:

import java.util.*;
public class Grades
{
public static boolean isNumeric(String s) {
    return java.util.regex.Pattern.matches("\\d+", s);   //checking regular expression will the given string is starting with digit or not
}
public static void main(String args[])
   {
   Scanner input=new Scanner(System.in);
   double count=0,sum=0;
   while (true)
       {
           System.out.print("Enter the grade of a student: ");
           String input_grade=input.nextLine(); //take grade input from user
           if (isNumeric(input_grade)==false) //if the grade input is not a Numeric value
               {
               System.out.println("The Average Grade in the Class is " + (sum/count)); //then print average
               break;//after that break the loop
               }
           else
               {
               sum=sum+Double.parseDouble(input_grade); //add the grade to sum
               count++;            //increment the count value
               }
       }
   }
}

Code and Outputs Screenshots:

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