Write a Java application that prompts the user for pairs of inputs of a product

Question

Write a Java application that prompts the user for pairs of inputs of a product number (1-5), and then an integer quantity of units sold (this is two separate prompts for input values). You must use a switch statement and a sentinel-controlled loop (i.e. a loop that stops execution when an out of range value, such as -1, is input). All 15 items below are for a single purchase. There are five sets of inputs as follows:

Product 1     1 unit                     (cost is $2.98 per unit)

Product 2     2 units                    (cost is $4.50 per unit)

Product 3     3 units                    (cost is $9.98 per unit)

Product 4     4 units                    (cost is $4.49 per unit)

Product 5     5 units                    (cost is $6.87 per unit)

Your application must calculate and display the total retail value of all products sold, after all 5 pairs of inputs are completed. You must also display the total after each new pair of input values is entered.

Explanation / Answer

The Simplest Solution is :

/* package whatever; */

import java.util.*;
import java.lang.*;
import java.io.*;

class Calculator
{
   public static void main (String[] args) throws java.lang.Exception
   {
       Scanner in = new Scanner(System.in);
       System.out.println("Enter product number :");
       int product = in.nextInt();
       System.out.println("Enter product quantity :");
       int quantity = in.nextInt();
       double total = 0;
      for(int i = 0; i < 5; i++){
           switch(product){
               case 1:
                   total += quantity * 2.98;
                   break;
               case 2:
                   total += quantity * 4.50;
                   break;
               case 3:
                   total += quantity * 9.98;
                   break;
               case 4:
                   total += quantity * 4.49;
                   break;
               case 5:
                   total += quantity * 6.87;
                   break;
               default:
                   break;
           }
           System.out.println("Total : "+total);
           System.out.println("Enter product number :");
           product = in.nextInt();
           if(product < 0 || product > 5)
               break;
           System.out.println("Enter product quantity :");
           quantity = in.nextInt();
           if(quantity < -1 || quantity > product)
               break;
       }
       System.out.println("Final Total : "+total);
   }
}

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