The ACME Company has approached you with a request to develop the psuedocode that will control the operations of their new series of vending machines. The program will be required to maintain the product inventory and money reservoir. The program should do the following operations:
1. Take as input an item number and money (The program terminates when a user enters a negative money amount and “000” as an item number.)
2. Check to see if the item exists. (if it doesn’t give the user a chance to re-enter the number)
3. Check to see if the money is sufficient enough to pay for item. (If not request more money)
4. Check to see if item is in stock. (If not user should be notified with the choice of selecting new item or cancelling the order)
5. If the item is in stock and the money is sufficient, the program should provide change and update the money reservoir and product inventory.
6. When the dispensing change, the program must insure that it always returns the correct amount of change based on the coins available in the reservoir. For example, if a user is owed $0.30 then the program may return 1 quarter and 1 nickel. However, if there are no quarters, the program should be smart enough to return a different combination of that doesn’t include quarters. (If no combination of change exists, the user’s order should be cancelled and the user should be allowed to make an alternate selection)
7. Once a transaction is complete, the user should be prompted to make a new selection. The program will end when a user enters a negative money amount and “000” for the item number.
Product Inventory:
Below is a breakdown of the products offered by the vending machine. In addition to the product names, the prices, item number and quantities are also listed below. The user will use the item number to select the product they wish to purchase.
Product Name Item Number Price Quantity in Stock
Candy Bar 123 $0.60 60
Gum 124 $0.35 75
Potato Chips 125 $0.75 40
Trail Mix 126 $.050 50
Breakfast Bar 127 $0.80 45
To develop the pseudocode for controlling the operations of the vending machines, you can follow these steps:
1. Start by initializing the product inventory and money reservoir variables. Set the quantities of each product and the amount of money available.
2. Create a loop that keeps running until the user enters a negative money amount and "000" as the item number. Inside the loop, prompt the user for the item number and money.
3. Check if the item number entered by the user exists in the product inventory. If it doesn't, give the user a chance to re-enter the number.
4. Check if the money entered by the user is sufficient to pay for the item. If it's not, request more money from the user.
5. Check if the selected item is in stock. If it's not, notify the user and give them the option to select a new item or cancel the order.
6. If the item is in stock and the money is sufficient, calculate the amount of change to be returned to the user. Ensure that you always return the correct amount of change based on the coins available in the reservoir. If no combination of change is possible, cancel the order and allow the user to make an alternate selection.
7. Update the money reservoir and product inventory after completing the transaction. Decrease the quantity of the selected item and deduct the price from the money reservoir.
8. Prompt the user to make a new selection by repeating the loop.
9. When the loop ends (user enters negative money amount and "000" as the item number), terminate the program.
This is a general outline of the pseudocode to control the operations of the vending machines. You can further refine the logic and add specific programming language syntax based on your requirements and the programming language you are using.
Here is the pseudocode for controlling the operations of the vending machine:
1. Initialize the money reservoir and product inventory.
2. Display a message to the user to enter an item number and money.
2.1. Read the item number and money from the user.
2.2. If the money is negative and the item number is "000", terminate the program.
3. Check if the item number exists in the product inventory.
3.1. If the item number doesn't exist, display an error message and go back to step 2.
4. Check if the money is sufficient to pay for the item.
4.1. If the money is less than the price of the selected item, display an error message and go back to step 2.
5. Check if the selected item is in stock.
5.1. If the quantity of the selected item is zero, display a message asking the user to select a new item or cancel the order.
5.2. If the user chooses to cancel the order, go back to step 2.
5.3. If the user chooses to select a new item, prompt the user to enter a new item number and go back to step 2.
6. Calculate the change to be given to the user.
6.1. Subtract the price of the item from the entered money to get the change.
6.2. Set the current change value to the calculated change.
6.3. Initialize variables for counting the number of each coin.
6.4. While the current change is greater than zero, do the following:
6.4.1. If the current change is greater than or equal to the value of a quarter and the quantity of quarters in the money reservoir is greater than zero, subtract a quarter from the current change and decrement the quantity of quarters.
6.4.2. If the current change is greater than or equal to the value of a dime and the quantity of dimes in the money reservoir is greater than zero, subtract a dime from the current change and decrement the quantity of dimes.
6.4.3. If the current change is greater than or equal to the value of a nickel and the quantity of nickels in the money reservoir is greater than zero, subtract a nickel from the current change and decrement the quantity of nickels.
6.4.4. If the current change is greater than or equal to the value of a penny and the quantity of pennies in the money reservoir is greater than zero, subtract a penny from the current change and decrement the quantity of pennies.
6.4.5. If none of the available coins can be used to make change, the user's order should be cancelled. Display a message indicating that change cannot be given and go back to step 2.
7. Update the money reservoir and product inventory.
7.1. Subtract the quantity of the selected item from the product inventory.
7.2. Add the entered money to the money reservoir.
8. Display a message to the user indicating the successful transaction and the change given.
8.1. Display the item name, price, and the change given.
9. Prompt the user to make a new selection and go back to step 2.
To develop the pseudocode that will control the operations of the vending machine, you can follow these steps:
Step 1: Initialize Variables
- Initialize the item number as an empty string.
- Initialize the money input as zero.
Step 2: Create a Loop
- Start a loop that continues until the user enters a negative money amount and "000" as the item number.
Step 3: Take Input
- Prompt the user to enter the item number and money.
- Read and store the input values.
Step 4: Check if the Item Exists
- Use conditional statements to check if the item number is valid.
- If the item number does not exist, display a message to the user and loop back to Step 3.
Step 5: Check if Money is Sufficient
- Use conditional statements to check if the money input is sufficient to pay for the selected item.
- If the money is not enough, prompt the user to enter more money and loop back to Step 3.
Step 6: Check if Item is in Stock
- Use conditional statements to check if the selected item is currently in stock.
- If the item is out of stock, display a message to the user with the choice to select a new item or cancel the order.
- If the user chooses to select a new item, loop back to Step 3.
- If the user chooses to cancel the order, loop back to the beginning of the loop (Step 2).
Step 7: Dispense the Item and Provide Change
- Calculate the amount of change needed by subtracting the item price from the money input.
- Use combinations of available coins in the money reservoir to provide the correct amount of change.
- If there is no combination of change available, cancel the order and display a message to the user.
- If there is a valid combination of change, update the money reservoir and product inventory, and display a message to the user confirming the transaction.
Step 8: Prompt for New Selection
- Display a message to prompt the user to make a new selection.
- Loop back to Step 3.
Step 9: End the Program
- Exit the loop when the user enters a negative money amount and "000" as the item number.
- Terminate the program.