Question

Please Walk me through this problem. Write a program that simulates the functionality of a vending machine having the following characteristics:

• The vending machine offers 5 products
• The vending machine accepts coins, 1 dollar bills, and 5 dollar bills
• The change is always given in coins, with maximum possible number of coins in each value: 25, 10, 5 or 1 cent.
• The selections available for user are numbers from 1 to 5.
• The user enters the money – simulate the action through a loop that ends when the user enters 0. Each coin, or paper bill will be read individually.
• The user makes the selection, and the machine allows a maximum 4 other selections if the amount entered doesn’t cover the price of the item.
• Once an item is delivered, the machine gives the change in coins.
• There is no increment for the money during one selection.
• The user can stop the selection at any time by entering 0 for the product selection.
• If the user chooses to cancel the selection, the machine returns the initial amount in coins.
• Display the outcome of the operation for each alternative you consider possible for the vending machine.
• Make sure that the machine returns the correct change at all times.

Use appropriate selection and repetition loops to solve the problem.

Write a test program that would take at least 3 combinations of amounts entered and choices of products, and displays the results of all three trials. You can include the vending machine program as a method in the testing program.

Answer 1

`Hey,

Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries

import java.util.Scanner;

public class VendingMachine {
  
   public static void printProducts(){
       System.out.println("1. Product1($7.5)");
       System.out.println("2. Product2($1.5)");
       System.out.println("3. Product3($2.75)");
       System.out.println("4. Product4($0.8)");
       System.out.println("5. Product5($6.25)");
   }
  
   public static void printMoney(){
       System.out.println("1. 5 dollar bill");
       System.out.println("2. 1 dollar bill");
       System.out.println("3. 50 cents coin");
       System.out.println("4. 25 cents coin");
       System.out.println("5. 10 cents coin");
       System.out.println("6. 5 cents coin");
       System.out.println("7. 1 cent coin");
   }
  
   public static int getProductPrice(int option){
       switch(option){
       case 1:
           return 750;
       case 2:
           return 150;
       case 3:
           return 275;
       case 4:
           return 80;
       case 5:
           return 625;
       default:
           return 0;
       }
   }
  
   public static int getMoneyByOption(int option){
       switch(option){
       case 1:
           return 500;
       case 2:
           return 100;
       case 3:
           return 50;
       case 4:
           return 25;
       case 5:
           return 10;
       case 6:
           return 5;
       case 7:
           return 1;
       default:
           return 0;
       }
   }
  
   public static int getInput(int max){
       Scanner in = new Scanner(System.in);
       while(true){
           System.out.print("Choose an option(0 to stop): ");
           int temp;
           temp = in.nextInt();
           if(temp >= 0 && temp <= max){
               return temp;
           }
           else{
               System.out.println("Invalid choice. try again!!!");
           }
       }
   }
  
   public static void displayChange(int money){
       int quarters = money / 25;
       money %= 25;
       int tens = money / 10;
       money %= 10;
       int fives = money / 5;
       money %= 5;
       int ones = money;
       System.out.println(quarters + " 25 cent coins");
       System.out.println(tens + " ten cent coins");
       System.out.println(fives + " five cent coins");
       System.out.println(ones + " one cent coics");
   }
  
   public static void main(String[] args){
       System.out.println("Enter your money details");
       printMoney();
       int money = 0, choice, price;
       while(true){
           choice = getInput(7);
           if(choice == 0){
               break;
           }
           else{
               money += getMoneyByOption(choice);
               System.out.println(money + " cents entered till now!!");
           }
       }
       for(int i = 0; i < 5; ++i){
           printProducts();
           choice = getInput(5);
           if(choice == 0){
               break;
           }
           price = getProductPrice(choice);
           if(price > money){
               System.out.println("your money does not cover item's price. try again");
           }
           else{
               System.out.println("Take your product");
               System.out.println("You paid: " + money + " cents");
               System.out.println("Item cost: " + price + " cents");
               money -= price;
               break;
           }
       }
       System.out.println("Change received");
       displayChange(money);
      
   }
}

Enter your money details
1. 5 dollar bill
2. 1 dollar bill
3. 50 cents coin
4. 25 cents coin
5. 10 cents coin
6. 5 cents coin
7. 1 cent coin
Choose an option(0 to stop): 2
100 cents entered till now!!
Choose an option(0 to stop): 4
125 cents entered till now!!
Choose an option(0 to stop): 5
135 cents entered till now!!
Choose an option(0 to stop): 6
140 cents entered till now!!
Choose an option(0 to stop): 6
145 cents entered till now!!
Choose an option(0 to stop): 7
146 cents entered till now!!
Choose an option(0 to stop): 7
147 cents entered till now!!
Choose an option(0 to stop): 7
148 cents entered till now!!
Choose an option(0 to stop): 0
1. Product1($7.5)
2. Product2($1.5)
3. Product3($2.75)
4. Product4($0.8)
5. Product5($6.25)
Choose an option(0 to stop): 2
your money does not cover item's price. try again
1. Product1($7.5)
2. Product2($1.5)
3. Product3($2.75)
4. Product4($0.8)
5. Product5($6.25)
Choose an option(0 to stop): 5
your money does not cover item's price. try again
1. Product1($7.5)
2. Product2($1.5)
3. Product3($2.75)
4. Product4($0.8)
5. Product5($6.25)
Choose an option(0 to stop): 4
Take your product
You paid: 148
Item cost: 80
Change received
2 25 cent coins
1 ten cent coins
1 five cent coins
3 one cent coics

Kindly revert for any queries

Thanks.