Question

3. Write a program that simulates a vending machine.   The user will be prompted to enter a number then a letter. As part of the prompt you must display a message to indicate the number and letter, along with the possible choices. That is, what selections will give user which item.   If the user enters a number or a letter that is not valid, then display the message “Bad Entry” and end the program. (100 pts)

Selections with messages.

1a - display the message “Here are your chips”
2a - display the message “Here is your soda”
3a – display the message “Here are your gummy worms”
1b – display the message “Here is your candy bar”
2b – display the message “Here is your popcorn”
3b – display the message “Here are your pretzels”

Answer 1

Program

import java.util.Scanner;
import java.lang.*; 
class VendingMachine 
{
        public static void main(String[] args) 
        {
                // declaring Scanner class object
                 Scanner scObj = new Scanner(System.in);
                 String choice;

// do while
                 do{
                         // printing prompt message to user
        
                        System.out.println(" \n1a - display the message “Here are your chips \n2a- display the message “Here is your soda \n3a- display the message “Here are your gummy worms \n1b- display the message “Here is your candy bar \n2b- display the message “Here is your popcorn \n3b- display the message “Here are your pretzels");
                        System.out.print("Enter your choice ");
                        // takes the input choice
            choice = scObj.next();
                switch(choice){
                        // if choice is any of the following case prints fhe respective message
                        case "1a":
                                System.out.print("Here are your chips");
                        break;
                        case "2a":
                                System.out.print("Here is your soda");
                        break;
                        case "3a":
                                System.out.print("Here are your gummy worms");
                        break;
                        case "1b":
                                System.out.print("Here is your candy bar");
                        break;
                        case "2b":
                                System.out.print("Here is your popcorn");
                        break;
                        case "3b":
                                System.out.print("Here are your pretzels");
                        break;
                        // none of the case will print the default case
                        default:
                                System.out.print("Bad Entry");
                        System.exit(0);
                }
                // continuee the loop until 

                } while(choice !="1a" && choice !="2a" && choice !="3a" && choice !="1b" && choice !="2b" && choice !="3b");
        
        }
}

output screen