Write a menu driven program to do each of the following. Continue to prompt the

Question

Write a menu driven program to do each of the following. Continue to prompt the user with the menu until option 11 – Quit is selected. Display an error message if the user makes an invalid selection.

PART I. SINGLE LOOPS Use the appropriate loop to do the following:

1. Write a WHILE LOOP that will print one row of 15 asterisks to the screen.

2. Write a FOR LOOP that will print one row of 15 asterisks to the screen.

3. Display the odd numbers between 1 and 50.

4. Write a code segment that will prompt the user to enter a positive number, max. Verify the number is positive before continuing. Display all integers from 1 to max.

5. Write a code segment that will prompt the user to enter a negative number, min. Verify the number is negative before continuing. Display all integers from 1 down to min.

6. Write a code segment that will prompt the user to enter a positive number, max. Sum all the even numbers from 2 to max and display the total.

7. Write a code segment that will prompt the user for a positive number, max, and display a table of integers from 1 to max. Display only 5 integers in each row. For example, the user enters a max of 12.

1 2 3 4 5

6 7 8 9 10

11 12

Hint: Find the pattern as to when a newline needs to occur. (Use the modulus (%) operator)

Hint2: Use printf( ) to format the numbers into columns

PART II. NESTED for LOOPS LAB

For problems 8-10, only one character (‘*’ or ‘ ‘ ) may be output at a time

8. Print a sequence of asterisk characters in the following configuration, continuing for LINES number of asterisks. LINES is a named constant with the value of 7.

*

*

*

*

*

*

*

9-10 Write nested for-loops that will display each of the following patterns:

9. ********** 10. **********

********* *********

******** ********

******* *******

****** ******

***** *****

**** ****

*** ***

** **

* *

11. Quit

Explanation / Answer

import java.util.Scanner;

public class LoopTest {

   public void function1() {
       System.out.println("Printing * using while loop");
       int i = 0;
       while (i < 15) {
           System.out.print("*");
           i++;
       }
   }

   public void function2() {
       System.out.println("Printing * using for loop");
       for (int i = 0; i < 15; i++) {
           System.out.print("*");
       }
   }

   public void function3() {
       int n = 50;
       System.out.println("Printing Odd numbers between 1 and " + n);
       for (int i = 1; i <= n; i++) {
           // if the number is not divisible by 2 then it is odd
           if (i % 2 != 0) {
               System.out.print(i + " ");
           }
       }
   }

   public void function4(int max) {
       if (max > 0) {
           for (int i = 1; i <= max; i++) {
               System.out.print(i+" ");
           }
       } else {
           System.out.println("Number is not positive");
       }
   }

   public void function5(int min) {
       if (min < 0) {
           for (int i = 1; i >= min; i--) {
               System.out.print(i+" ");
           }
       } else {
           System.out.println("Number is not negative");
       }
   }

   public void function6(int max) {
       int sum = 0;      
       if (max > 0) {
           for (int i = 2; i <= max; i++) {
               sum += i;
           }
           System.out.println("Sum = " + sum);
       } else {
           System.out.println("Number is not positive");
       }
   }

   public void function7(int max) {
       if (max > 0) {
           for (int i = 1; i <= max; i++) {
               if ((i - 1) % 5 == 0)
                   System.out.println();
               System.out.print(i+" ");
           }
       } else {
           System.out.println("Number is not positive");
       }
   }

   public void function8() {
       int lines = 7;
       for (int i = 1; i <= lines; i++) {
           System.out.println("*");
           for (int j = 1; j <= i; j++) {
               System.out.print(" ");
           }
       }
   }

   public void function9() {
       int n = 10;
      
       for( int i = 1; i <= n; i++ )
        {
            for( int j = 1; j <= n; j++ )
            {

        if(i<=j)
                System.out.print( "*" );
            }
            System.out.println();
        }
   }

   public void function10() {
       int n = 10;
       for( int i = 1; i <= n; i++ )
        {
            for( int j = 1; j <= n; j++ )
            {

        if(i<j)
                System.out.print( "*" );
                else
                  System.out.print(" ");
            }
            System.out.println();
        }
   }

   public static void main(String[] args) {
       String choice = null;
       LoopTest test = new LoopTest();
       Scanner scan = new Scanner(System.in);
       do {
           System.out.println(" Main Menu: Enter your choice:: enter 11 to quit");          
           choice = scan.nextLine();
           switch (choice) {
           case "1":
               test.function1();
               break;
           case "2":
               test.function2();
               break;
           case "3":
               test.function3();
               break;
           case "4":
               System.out.println("Enter a positive number");
               int max = Integer.parseInt(scan.nextLine());
               test.function4(max);
               break;
           case "5":
               System.out.println("Enter a negative number");
               int min = Integer.parseInt(scan.nextLine());
               test.function5(min);
               break;
           case "6":
               System.out.println("Enter a positive number");
               max = Integer.parseInt(scan.nextLine());
               test.function6(max);
               break;
           case "7":
               System.out.println("Enter a positive number");
               max = Integer.parseInt(scan.nextLine());
               test.function7(max);
               break;
           case "8":
               test.function8();
               break;
           case "9":
               test.function9();
               break;
           case "10":
               test.function10();
               break;
           }
       } while (!choice.equals("11"));
       scan.close();
   }

}

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