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I was bored and that can be a dangerous thing. Like doodling on the phone book while you are talking on the phone, I doodle code while answering questions on DIC. Yeah, it means I have no life and yes it means I was born a coder. During this little doodle I decided to make a slot machine. But not your standard slot machine per say, but one designed a little bit more like the real thing. Sure it could have been done a little more simpler and not even using a Wheel class at all, but what fun is that? In this entry I show the creation of a slot machine from a bit more of a mechanical aspect than a purely computerized one. It should provide a small sampling of classes and how they can represent real life machines. We cover it all right here on the Programming Underground!
So as I have already said, this little project was just something to play around with. It turned out kinda nice, so I thought I would share it. But what did I mean about it being mechanical in nature? Well, if you have ever played a real slot machine, not the digital ones they have in casinos now, you would see a metal case with a series of wheels. Typically it would be three wheels with pictures on them. When you put your money in and pull the handle the wheels would be set into motion. They would spin and then the first wheel would stop, followed by the second and then the third. After they have all stopped, the winnings are determined and you are paid out in coinage or credits.
I thought, why not be a bit mechanical in this slot machine design and create the wheels as a class called “Wheel” and give it the ability to spin independently of the other wheels? Have the wheel keep track of which picture (or in our case number) is flying by and report the results to the actual slot machine class. I could have done this mechanism without the need of a wheel at all and instead load up an array and have it randomly pick a number from the wheel. Little slimmer, little more efficient but wouldn’t show much programming theory.
What do we gain by recreating these Wheel classes and spinning them independently? Well, you gain a slight bit of flexibility. Independently we are able to control the speed of the spinning if we wanted to, we are able to grasp the idea of the wheel as a concept in our mind and manipulate it. We could easily built in features like if the wheel lands on a certain number it will adjust itself. Like some slots in Vegas, if you land on lets say a rocket in the center line, the machine would see the rocket and correct the wheel to spin backwards 1 spot (in the direction of the rocket as if the rocket was controlling the wheel). We could spin one wheel one way and another wheel another. We could inherit from that wheel and create a specialized wheel that does a slew of new different behaviors. All encapsulated into one solid object making the actual Machine class oblivious to the trickery of the wheel itself… encapsulation at its finest!
The machine class we create will contain 3 pointers. Each to one of the wheels. The machine itself will be in charge of a few different tasks. Taking money, issuing and removing credits, determining when to spin, telling each of the wheels to spin and checking our winnings based on some chart we create. It has enough on its plate than worrying about the wheels and reading their values.
So lets start with our Wheel class and its declaration/implementation…
wheel.h
As you can see the wheel itself is not a difficult concept to envision. The bulk of the work is in the read() method. Here we simply read the values from our internal array of integers (the values on the wheel) and return those values as an array of the three integers… representing the visible column. This column will then be loaded into our 2-Dimensional Array back in the Machine class. The 2D array represents the view or screen by which the user sees the results. Remember that the user never gets to see the entire wheel. Only the 3 consecutive values on the face of the wheel.
Here is how it may look in the real world. We have our machine with the three wheels and our 2D array called “Screen” which acts as our viewing window. Each wheel will report its values and those values will be put into the screen…
Below is our machine class…
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machine.h
This looks like a lot of code but really it is not if you look at each function. Most of them are very very simple to understand. We have a spin method which essentially spins each of the wheels, reads their values back from the Wheel class into a pointer (representing each column), then they are loaded into the 2D array one column at a time (our view screen), printed for the user to see the results and lastly the winnings are checked. The checkwinnings() method determines which rows to check based on the amount of the bet. If they chose 1 line, it checks for winning combinations on the middle row only. If they choose 2 lines, it checks the middle and top lines, 3 line bet checks all three horizontal rows, 4 line bet checks the first diagonal as well and 5 line bet checks both diagonals in addition to the lines.
How does it check the lines? Well each line is given to the checkline() helper function which compares the 3 values of the line against an enumerated type of various symbols. Here we are just assigning a symbol against each numbered value to help the programmer determine which numbers correspond to which winning combos. For instance, luckyseven represents the number 3 in the enumeration. So if it runs across a line with 3 number 3s, then it knows it hit the grand jackpot and credits the player 1000. This method makes things easy because if we ever wanted to change the win patterns later, we could change the enum and checkline method to do so. We could also build in multiple types of symbols and even let the user choose what slot machine game they want to go by. It becomes very flexible and is a testament to great design!
Lastly we can put some tests together just to show some the various aspects of how this thing works and how the programmer can use the classes…
slotmachine.cpp
This simply inserts a 5 dollar bill and a coin for good luck. Then bets 5 lines and spins. Despite the outcome we go and bet five lines again and spin once more. Hopefully we win something this time around! But either way, those are the classes for you and I hope you like them. As always, all code here on the Programming Underground is in the public domain and free for the taking (just don’t cause a mess in isle 3, I am tired of running out there for cleanup). Thanks for stopping by and reading my blog. 🙂
Players dream of hitting a big jackpot when they play the slots. When that day comes for you, you'll have questions about the taxes you must pay on the winnings.
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When you hit the winning combination of symbols for a large jackpot, your slot machine locks up. Depending on the machine, the lights on top of the machine may come on and start flashing, music may play or bells ring. A slot attendant arrives promptly to see what you have won.
On jackpots smaller than $5,000, an attendant verifies that you hit the jackpot and then assists you in claiming your money at the cashier's cage. In the case of a large or progressive jackpot, the casino may have technicians come and check the machine to certify that it was functioning properly when the jackpot hit. If you hit one of the wide-area progressive machines such as MegaBucks, the slot company that operates the game comes out and verifies that machine before giving you a check.
When you hit a jackpot, you have the option of taking your winnings in cash or check. Usually, large amounts are paid by check. In the case of the MegaBucks or similar multi-million dollar jackpots, you receive a check for the partial amount, and then you have 90 days to decide if you want to be paid a lump sum or an annual annuity on the balance. If you select the lump sum option, you receive only a percentage of your actual winnings. For example, the full winnings of one multi-million slot jackpot is paid in 25 annual installments, or you can take a lump sum of 60 percent of the winnings.
IRS Withholding
All casino winnings are subject to federal taxes. However, the IRS only requires the casinos to report wins over $1,200 on slots and video poker machines or other games such as keno, lottery or horse racing. When you have a win equal to or greater than $1200, you are issued a W-2G form. This form lists your name, address and Social Security number. The casinos are not required to take out withholding tax on jackpots under $5,000 as long you supply your Social Security number. If you don’t provide your Social Security number, the casinos withhold 28 percent on small jackpots.
You can request a specific amount of withholding tax to be taken out of any jackpot you win. Some players like to do this to avoid a big tax payment in April when they file their income tax returns. The additional withholding may not be necessary if you keep a log book. The law allows you to deduct gambling losses up to the amount of your winnings. You can only do this if you have documentation of your losses. Keeping a diary or log book is the way to do this.
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Casinos can refuse to pay you until you produce proper identification—a photo ID such as a driver’s license, military ID or passport.
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If you don’t produce an ID, you are photographed and the casino holds your winnings until you come back with proper ID. For this reason, you should always carry a valid form of identification with you when you visit the casino.
When the casino checks your identification, it also checks your age to make sure you are legally old enough to play. The minimum age for gambling varies from state to state, but under-age gamblers are not be paid if they hit a jackpot. This is the law in all jurisdictions, and it has been upheld in court.
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Before you start playing your favorite slot machine you should have a plan for the day you hit a jackpot. Players become excited when they hit the big one, and this may affect the decisions you make about your winnings. It is helpful if you know ahead of time how much withholding you want taken out or whether you want a check for all or some of the amount.