Question

Provide comments for this code explaining what each line of code does

import java.util.*;
public class Chpt8_Project
{
   public static void main(String[] args)   
   {
       Scanner sc=new Scanner(System.in);
       int [][]courses=new int [10][2];
       for(int i=0;i<10;i++)
       {
           while(true)
           {
               System.out.print("Enter classes and graduation year for student "+(i+1)+":");
               courses[i][0]=sc.nextInt();
               courses[i][1]=sc.nextInt();
               if(courses[i][0]>=1 && courses[i][0]<=20)
                   break;
               else
                   System.out.println("The number of classes for student "+(i+1)+" is not valid.");
           }
       }
       sc.close();
       for(int i=0;i<10;i++)
       {
           System.out.println("Student "+(i+1)+" needs "+(courses[i][0]*3)+" credits to graduates in "+courses[i][1]+"\n");
       }
   }

}

Answer 1

Code Screenshot

Code

import java.util.*;

public class Chpt8_Project

{

   public static void main(String[] args)  

   {

       // create a Scanner class object to get user input

       Scanner sc=new Scanner(System.in);

      

       // create an array of dimension 10x2

       int [][]courses=new int [10][2];

      

       // traverse the rows in te matrix

       for(int i=0;i<10;i++)

       {

           // infinite loop

           while(true)

           {

               System.out.print("Enter classes and graduation year for student "+(i+1)+":");

              

               // get the classes for the current course

               courses[i][0]=sc.nextInt();

              

               // get the graduation year for the current course

               courses[i][1]=sc.nextInt();

              

               // if the classes and graduation year enetered are in valid range

               if(courses[i][0]>=1 && courses[i][0]<=20)

                   // break out of the loop

                   break;

               // if the classes and graduation year enetered are not in valid range

               else

                   // display an error message to the user

                   System.out.println("The number of classes for student "+(i+1)+" is not valid.");

           }

       }

      

       // close the Scanner object

       sc.close();

      

       // traverse each row in the array or each course

       for(int i=0;i<10;i++)

       {

           // display the desired output for i th course

           System.out.println("Student "+(i+1)+" needs "+(courses[i][0]*3)+" credits to graduates in "+courses[i][1]+"\n");

       }

   }

}