Question

Write a program to print following patterns with the help of users choice statement(switch-case). Print appropriate menu with options.
(i) using for loop (ii) using while loop
1 2 3 4 5 A
1 2 3 4 A B
1 2 3 A B C
1 2 A B C D
1 A B C D E

Answer 1

Here's the Java code for the required program. The description is given as comments. Paste it into an IDE, so that code and comments can be seen properly.



import java.util.Scanner;  //Importing Scanner for input
public class Brainly        //Creating a Class
{
    public static void main(String[] args)      //Creating main() function
    {
        Scanner sc = new Scanner(System.in);        //Declaring Scanner Object

        System.out.println("1. Print Pattern using for loop");      //Printing Menu Options
        System.out.println("2. Print Pattern using while loop");
        System.out.println("3. Exit");

        System.out.print("\nEnter your choice: ");          //Asking User for Choice Input
        int choice = sc.nextInt();                          //Storing User Input in choice

        System.out.println();
       
        int i,j,k,ch;               //Variables to be used for pattern printing
       
        switch(choice)
        {
            case 1:         //for loop case

           
            for(i=5;i>0;i--)        //Outermost loop of i prints 5 rows
            {
                for(j=1;j<=i;j++)       //The loop of j prints the numbers in each row
                {
                    System.out.print(j+" ");
                }
               
                ch=65;      //65 is the ASCII Code for "A"
               
                for(k=5;k>=i;k--)       //The loop of k prints the characters in each row
                {
                    System.out.print((char)ch+" ");         //ASCII Value is casted into char type and printed
                    ch++;
                }
                System.out.println();
            }
           
            break;
           
           
            case 2:             //while loop case
            i=5;
            while(i>0)
            {
                j=1;
                while(j<=i)
                {
                    System.out.print(j+" ");
                    j++;
                }
               
               
                ch=65;      //65 is the ASCII Code for "A"
               
                k=5;
                while(k>=i)
                {
                    System.out.print((char)ch+" ");
                    ch++;
                    k--;
                }
               
                System.out.println();
                i--;
            }
           
            break;
           
            case 3:         //Exit case
            break;

            default:        //Default Case for Invalid Choice
            System.out.println("Invalid Choice");
        }
    }
}