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Menu Driven Program - Java Programs

Using the switch statement, write a menu-driven program to perform the following operations:
(i) To print the value of z where z = (x³ + 0.5x) / y where x ranges from -10 to 10 with an increment of 2 and y remains constant as 5.5.
(ii) To print the Floyd’s Triangle with N rows.

Example:
If N = 5
OUTPUT:

1
2    3
4    5    6
7    8    9    10
11   12   13   14   15

Java


import java.util.*;
class Menu{
    public static void main(String args[]){
        Scanner in = new Scanner (System.in);
        System.out.println("1. Print the value of z");
        System.out.println("2. Floyd\'s Triangle with N rows");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();

        switch(choice){
            case 1:
            System.out.print("y = ");
            double y = in.nextDouble();
            for(int x = -10; x <= 10; x += 2){
                double z = (Math.pow(x, 3) + 0.5 * x) / y;
                System.out.print(z + "\t");
            }
            System.out.println();
            break;

            case 2:
            int num = 1;
            System.out.print("N = ");
            int n = in.nextInt();
            for(int i = 1; i <= n; i++){
                for(int j = 1; j <= i; j++){
                    System.out.print(num + "\t");
                    num++;
                }
                System.out.println();
            }
            break;
            default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. Print the value of z
2. Floyd's Triangle with N rows
Enter your choice: 1
y = 5
-201.0  -103.2  -43.8   -13.2   -1.8    0.0 1.8 13.2    43.8    103.2   201.0    

 OUTPUT 2: 
1. Print the value of z
2. Floyd's Triangle with N rows
Enter your choice: 2
N = 5
1   
2   3   
4   5   6   
7   8   9   10  
11  12  13  14  15