Question

Write a java program that will first display the following menu: Choose one of the following 1- To add 2 double integers 2- To add 2 integer numbers 3- To add 3 double numbers 4- To add 3 integer numbers After reading user’s choice, use a switch case statement to call the corresponding method Void add 1 (double n1, double n2) Void add2() Double add3 (double n1, double n2, double n3) Double add4 ()

Answer 1

// Screenshot of the code & output

// Code to copy

Add.java

import java.util.Scanner;

public class Add {

   public static void main(String[] args) {
      
       Scanner userInput = new Scanner(System.in);
      
       System.out.println("Please enter your choice.\n "
               + " 1- To add 2 double integers.\n "
               + " 2- To add 2 integer numbers.\n "
               + " 3- To add 3 double numbers.\n "
               + " 4- To add 3 integer numbers");
      
       int n = userInput.nextInt();
      
       switch(n){
         
       case 1:
           System.out.print("Enter first double : ");
           double num1=userInput.nextDouble();
           System.out.print("Enter second double : ");
           double num2=userInput.nextDouble();
           System.out.println("Sum of the two doubles: "+ add1(num1,num2));
           break;
       case 2:
           System.out.print("Enter first integer : ");
           int num3=userInput.nextInt();
           System.out.print("Enter second integer : ");
           int num4=userInput.nextInt();
           System.out.println("Sum of the two intgers: "+ add2(num3,num4));
           break;
       case 3:
           System.out.print("Enter first double : ");
           double num5=userInput.nextDouble();
           System.out.print("Enter second double : ");
           double num6=userInput.nextDouble();
           System.out.print("Enter third double : ");
           double num7=userInput.nextDouble();
           System.out.println("Sum of the three doubles: "+ add3(num5,num6,num7));
           break;
       case 4:
           System.out.print("Enter first integer : ");
           int num8=userInput.nextInt();
           System.out.print("Enter second integer : ");
           int num9=userInput.nextInt();
           System.out.print("Enter third integer : ");
           int num10=userInput.nextInt();
           System.out.println("Sum of the three intgers: "+ add4(num8,num9,num10));
           break;
          
   default:      
       System.out.println("invalid choice");
       }
       userInput.close();
   }

  

   private static double add1(double num1, double num2) {      
       return num1+num2;
   }
   private static int add2(int num3, int num4) {      
       return num3+num4;
   }
   private static double add3(double num5, double num6, double num7) {      
       return num5+num6+num7;
   }
   private static int add4(int num8, int num9,int num10) {      
       return num8+num9+num10;
   }
}