Vending Machine - Java Algorithm

Java examples for Algorithm:Number

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Description

Vending Machine

Demo Code

import java.util.Scanner;

public class VendingMachine {
  static Scanner input = new Scanner(System.in);
  static int balance = 0, product, coins, bills, total = 0, change = 0,
      options;//from www.j  av  a 2s  .  com

  public static void payment(int opt, int coin, int bill) {
    System.out.println("\nPlease select the payment method.");
    do {
      // enter money options
      System.out.println("0. Stop Enter Money");
      System.out.println("1. Enter coins");
      System.out.println("2. Enter bills");
      options = opt;
      
      

      if (options == 0) {
        break;
      }
      // The vending machine accepts coins,
      else if (options == 1) { // 1 for coins
        System.out.println("Enter coins");
        System.out.print(coin);
        do {
          coins = coin;
          // enter coins
          switch (coins) {
          case 0:
            break;
          case 1: // penny
            total += 1;
            break;
          case 5: // nickle
            total += 5;
            break;
          case 10: // dime
            total += 10;
            break;
          case 25: // quarter
            total += 25;
            break;
          default:
            System.out
                .println("Invalid Coins, Please enter the new coins");
          }
        } while (coins != 0);
      } else if (options == 2) {// 2 for bills
        System.out.println("Enter bills");
        System.out.print(bill);
        do {
          bills = bill;
          // enter bills
          switch (bills) {
          case 0:
            break;
          case 1: // 1 dollar
            total += 100;
            break;
          case 5: // 5 dollar
            total += 500;
            break;
          default:
            System.out
                .println("Invalid Bills, Please enter the new bills");
          }
        } while (bills != 0);
      } else {
        System.out.println("Invalid Options");
      }
    } while (options != 0);
  }
  
  public static void payment() {
    System.out.println("\nPlease select the payment method.");
    do {
      // enter money options
      System.out.println("0. Stop Enter Money");
      System.out.println("1. Enter coins");
      System.out.println("2. Enter bills");
      options = input.nextInt();
      if (options == 0) {
        break;
      }
      // The vending machine accepts coins,
      else if (options == 1) { // 1 for coins
        System.out.println("Enter coins");
        do {
          coins = input.nextInt();
          // enter coins
          switch (coins) {
          case 0:
            break;
          case 1: // penny
            total += 1;
            break;
          case 5: // nickle
            total += 5;
            break;
          case 10: // dime
            total += 10;
            break;
          case 25: // quarter
            total += 25;
            break;
          default:
            System.out
                .println("Invalid Coins, Please enter the new coins");
          }
        } while (coins != 0);
      } else if (options == 2) {// 2 for bills
        // 1 dollar bills, and 5 dollar bills
        System.out.println("Enter bills");

        do {
          bills = input.nextInt();
          // enter bills
          switch (bills) {
          case 0:
            break;
          case 1: // 1 dollar
            total += 100;
            break;
          case 5: // 5 dollar
            total += 500;
            break;
          default:
            System.out
                .println("Invalid Bills, Please enter the new bills");
          }
        } while (bills != 0);
      } else {
        System.out.println("Invalid Options");
      }
    } while (options != 0);
  }

  public static void purchase() {
    // ////////Start PURCHASE module/////////////////////////////////
    System.out.println("Please select your product.");
    // select the product
    product = input.nextInt();

    switch (product) {
    case 0:
      balance += 0;
      break;
    case 1:
      balance += 36;
      break;
    case 2:
      balance += 45;
      break;
    case 3:
      balance += 55;
      break;
    case 4:
      balance += 125;
      break;
    case 5:
      balance += 150;
      break;
    default:
      System.out.println("Invalid Products");
    }
  }

  public static String calCoins(int changes) {
    String changeString = "";
    int quarters, remQuarters=0;
    int dimes, remDimes=0;
    int nickles, remNickles=0;
    int pennies=0;
    
    quarters = change/25;
    remQuarters =change%25;
    changeString += quarters + " quarters\n";

    if(remQuarters!=0) {
      dimes = remQuarters/10;
      remDimes = remQuarters%10;
      changeString += dimes + " dimes\n";
    } 
    
    if (remDimes!=0) {
      nickles = remDimes/5;
      remNickles = remDimes % 5;
      changeString += nickles + " nickles\n";
    }
    
    if (remNickles!=0) {
      pennies = remNickles;
      changeString += pennies + " pennies\n";
    }
    return changeString;
  }
  
  public static String change() {
        String changeDisplay="";
        if (total > balance) {
          change = total - balance;
          //calculate for coins
          changeDisplay = calCoins(change);
        }
        else {
          changeDisplay ="Enter more money";
        }
        
        return changeDisplay;
  }
  
  public static void display() {
    System.out.println("BALANCE : " + balance);
    System.out.println("TOTAL MONEY : " + total);
    System.out.println("CHANGE :\n " + change());
  }
  
  public static void main(String[] args) {
    System.out.println("HELLO Customer!");
    System.out.println("0. Get money back");
    System.out.println("1. Kitkat\t$.36");
    System.out.println("2. Mars\t\t$.45");
    System.out.println("3. Reese\t$.55");
    System.out.println("4. Twix\t\t$1.25");
    System.out.println("5. Snicker\t$1.50");

    payment();
    purchase();
    change();
    display();
  }
}

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