Question

Summary

In this lab, you add nested loops to a Java program provided. The program should print the letter E. The letter E is printed using asterisks, three across and five down. Note that this program uses System.out.print("*"); to print an asterisk without a new line.

Instructions

1. Write the nested loops to control the number of rows and the number of columns that make up the letter E.
2. In the loop body, use a nested if statement to decide when to print an asterisk and when to print a space. The output statements have been written, but you must decide when and where to use them.
3. Execute the program. Observe your output.
4. Modify the program to change the number of rows from five to seven and the number of columns from three to five. What does the letter E look like now?

5. // LetterE.java - This program prints the letter E with 3 asterisks
   // across and 5 asterisks down.
   // Input: None.
   // Output: Prints the letter E.

   public class LetterE
   {
   public static void main(String args[])
   {
     
   
   final int NUM_ACROSS = 3; // Number of asterisks to print across.
   final int NUM_DOWN = 5; // Number of asterisks to print down.
   int row; // Loop control for row number.
   int column; // Loop control for column number.

   // This is the work done in the detailLoop() method
   // Write a loop to control the number of rows.
   // Write a loop to control the number of columns
   // Decide when to print an asterisk in every column.
   System.out.print(" ");
   // Decide when to print asterisk in column 1.
   System.out.print(" ");
   // Decide when to print a space instead of an asterisk.
   System.out.print(" ");
   // Figure out where to place this statement that prints a newline.
   System.out.println();

   // This is the work done in the endOfJob() method
   System.exit(0);
   } // End of main() method.

   } // End of LetterE class.
   

Answer 1

Hello, here is the completed code you wanted. Every important statement is explained using comments. Please check and let me know if you have any doubts. Thanks.

CODE

// LetterE.java - This program prints the letter E with 3 asterisks
// across and 5 asterisks down.
// Input: None.
// Output: Prints the letter E.
public class LetterE
{
   public static void main(String args[])
    {
       // Number of asterisks to print across.
       final int NUM_ACROSS = 3;
      
       // Number of asterisks to print down.
       final int NUM_DOWN = 5;
      
       // Loop control for row number.
       int row;
      
       // Loop control for column number.
       int column;
      
       // Write a loop to control the number of rows.
       for(row = 0; row < NUM_DOWN; row++)
       {
           // Write a loop to control the number of columns
           for(column = 0; column < NUM_ACROSS; column++)
           {
               /*
                   Number of rows are 5 and columns are 3
                   rows are 0 - 4 and columns are 0 - 2
                   first row will be 0 and last row will be 4
                   first column will be 0 and last column will be 2
                   we have to print * in every column for first, third and fifth row
                   ie. 0, 2, 4 rows which are even rows
                   we have to print * in column 1 for second and fourth row
                   ie. 1, 3 rows and column 0 which are odd rows
               */
               // Decide when to print an asterisk in every column.
               //if row is an even number
               if(row % 2 == 0)
               {
                   System.out.print("*");
               }
               // Decide when to print asterisk in column 1.
               //if row is odd and column is 0
               else if(row % 2 == 1 && column == 0)
               {
                   System.out.print("*");
               }
               // Decide when to print a space instead of an asterisk.
               //if row is odd and column is not 0
               else
               {
                   System.out.print(" ");
               }
           }
           // Figure out where to place this statement that prints a newline.
           //after printing each row
           System.out.println();
       }
       //exiting program
       System.exit(0);
   } // End of main() method.
} // End of LetterE class

OUTPUT

CODE SCREEN SHOT