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Menu Driven - Pattern Program - Java Programs

Using the switch statement, write a menu-driven program for the following:
(i) To print the Floyd’s triangle given below:
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

(ii) To display the following pattern:
I
IC
ICS
ICSE

For an incorrect option, an appropriate error message should be displayed.

Java


import java.util.Scanner;
class Menu{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("1. Floyd's triangle");
        System.out.println("2. ICSE Pattern");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            int n = 1;
            for(int i = 1; i <= 5; i++){
                for(int j = 1; j <= i; j++){
                    System.out.print(n + " ");
                    n++;
                }
                System.out.println();
            }
            break;
        case 2:
            String s = "ICSE";
            for(int i = 0; i < s.length(); i++)
                System.out.println(s.substring(0, i + 1));
            System.out.println();
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. Floyd's triangle
2. ICSE Pattern
Enter your choice: 1
1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 
 

 OUTPUT 2: 
1. Floyd's triangle
2. ICSE Pattern
Enter your choice: 2
I
IC
ICS
ICSE