Question

Create a Java application to simulate a “GradeBook”. A teacher has five students who have taken four exams. The teacher uses the following grading scale to assign a letter grade to a student, based on the average of his or her four exam scores:

Average	Letter Grade
90 – 100	A
80 – 89	B
70 – 79	C
60 – 69	D
0 – 59	F

Write logic to create a String array to hold student names, a character array to hold student letter grades, and a two-dimensional array to hold each of the five students’ test scores for each of the four exams completed during the semester.

Use nested for loop logic to fill the names and test scores arrays. Do not accept test scores less than zero or greater than 100. Make sure you test both ends of the range!

Use another nested for loop to compute the average test score for each student and then assign the corresponding letter the letter grade array. Make sure you test each letter grade value!

Use while loop logic to display a table showing each student’s name and letter grade.

Answer 1

Code - Main.java

import java.util.*;
public class Main
{
   public static void main(String[] args) {
   //Scanner to read user input
   Scanner sc = new Scanner(System.in);
   //array declared and variables
   String sName[] = new String[5];
   char grade[] = new char[5];
   int testScore[][] = new int[5][4];
   int i,j;
   int average[] = new int[5];
   //Nested for loop to get the student and marks for the corresponding student in 4 subject
   for(i = 0;i<sName.length;i++){
   System.out.println("Enter student name "+(i+1)+": ");
   sName[i] = sc.next();
   for(j=0;j<testScore[i].length;){
   System.out.println("Enter marks in "+(j+1)+" subject: ");
   testScore[i][j] = sc.nextInt();
   //if marks is greater than 100 and less than 0
   if(testScore[i][j]<0 || testScore[i][j]>100)
   System.out.println("Pls enter marks between 0 to 100");
   else
   j++;
   }
   System.out.println();
  
   }
   //for loop to calculate the average
   int sum;
   for(i = 0;i<testScore.length;i++){
   sum = 0;
   for(j=0;j<testScore[i].length;j++){
   sum += testScore[i][j];
   }
   average[i] = sum / testScore[i].length;
   }
   //for loop to calculate the grade
   for(i = 0;i<average.length;i++){
   if(average[i]>=90 && average[i]<=100){
   grade[i] = 'A';
   }
   else if(average[i]>=80 && average[i]<=89){
   grade[i] = 'B';
   }
   else if(average[i]>=70 && average[i]<=79){
   grade[i] = 'C';
   }
   else if(average[i]>=60 && average[i]<=69){
   grade[i] = 'D';
   }
   else if(average[i]>=0 && average[i]<=59){
   grade[i] = 'F';
   }
   }
   int count = 0;
   //while loop to print the result out
   while(count<sName.length){
   System.out.println("Student name: "+sName[count]+" grade: "+grade[count]);
   count++;
   }
  
   }
}

Screenshots -