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Math
Slot machine java free download. The Julia Programming Language Julia is a fast, open source high-performance dynamic language for technical computing.
Math is one of JavaScript's global or standard built-in objects, and can be used anywhere you can use JavaScript. It contains useful constants like π and Euler’s constant and functions such as floor(), round(), and ceil().
In this article, we'll look at examples of many of those functions. But first, let's learn more about the Math object.
Example
The following example shows how to use the Math object to write a function that calculates the area of a circle:
Math Max
Math.max() is a function that returns the largest value from a list of numeric values passed as parameters. If a non-numeric value is passed as a parameter, Math.max() will return NaN.
An array of numeric values can be passed as a single parameter to Math.max() using either spread (...) or apply. Either of these methods can, however, fail when the amount of array values gets too high.
Syntax
Parameters
Numbers, or limited array of numbers.
Return Value
The greatest of given numeric values, or NaN if any given value is non-numeric.
Examples
Numbers As Parameters
Invalid Parameter
Array As Parameter, Using Spread(…)
Array As Parameter, Using Apply
Math Min
The Math.min() function returns the smallest of zero or more numbers.
You can pass it any number of arguments.
Math PI
Math.PI is a static property of the Math object and is defined as the ratio of a circle’s circumference to its diameter. Pi is approximately 3.14149, and is often represented by the Greek letter π.
Examples
More Information:
Math Pow
Math.pow() returns the value of a number to the power of another number.
Syntax
Math.pow(base, exponent), where base is the base number and exponent is the number by which to raise the base.
pow() is a static method of Math, therefore it is always called as Math.pow() rather than as a method on another object.
Examples
Math Sqrt
The function Math.sqrt() returns the square root of a number.
If a negative number is entered, NaN is returned.
sqrt() is a static method of Math, therefore it is always called as Math.sqrt() rather than as a method on another object.
Syntax
Math.sqrt(x), where x is a number.
Examples
Math Trunc
Slot Machine Simulator Java Code
Math.trunc() is a method of the Math standard object that returns only the integer part of a given number by simply removing fractional units. This results in an overall rounding towards zero. Any input that is not a number will result in an output of NaN.
Careful: This method is an ECMAScript 2015 (ES6) feature and thus is not supported by older browsers.
Examples
Math Ceil
The Math.ceil() is a method of the Math standard object that rounds a given number upwards to the next integer. Take note that for negative numbers this means that the number will get rounded “towards 0” instead of the number of greater absolute value (see examples).
Examples
Math Floor
Math.floor() is a method of the Math standard object that rounds a given number downwards to the next integer. Take note that for negative numbers this means that the number will get rounded “away from 0” instead of to the number of smaller absolute value since Math.floor() returns the largest integer less than or equal to the given number.
Examples
An application of math.floor: How to Create a JavaScript Slot Machine
For this exercise, we have to generate three random numbers using a specific formula and not the general one. Math.floor(Math.random() * (3 - 1 + 1)) + 1;
Another example: Finding the remainder
Example
Usage
In mathematics, a number can be checked even or odd by checking the remainder of the division of the number by 2.
Note Do not confuse it with modulus% does not work well with negative numbers.
More math-related articles:
A couple of years ago, when I was learning Java programming, I thought of testing myself and my programming skills by writing a game in Java. Now, I'm not going to call it 'game programming', since game programming is way more than what I did. In fact, what I did was just a test for me. So I decided to write a game I was playing on my old Nokia E50 phone, a Slot Game.
This slot game I was playing on my phone was really simple. It had only 3 slots with different items in each. You had to push the Spin button in order to spin the slots, and you would win a small amount of coins if two or three slots were alike. Of course, 3 slots were better than 2. It is not really hard to make a game like this, but for a beginner it is good to start with. As I remember, this was probably the first program that I could tell others: “Look at what I just did!”
So I started working on it (I remember using NetBeans at that time), firstly as console-only, and then using GUI. The first thing I did, was deciding what kind of images (actually their names, not the images themselves) I would use. I wrote this line of code:
I also decided what would be the amount of “money” that the user would win if he matched two or three symbols:
After that, I went on writing the code that was suposed to randomly choose one of the elements in the symbols array. This could be done by using the Math.random() method, or by calling the nextInt() method at a Random instance, or by the wrong way I used to do at the beginning:
Of course, I soon switched to calling Math.random(), and in order to get a number that I could use as an index for my array, I wrote this block of code:
So the variable choice was the random index that I could use to get a random item from the array (keep in mind that Math.random() returns a double between 0.0 and 1.0)
So after choosing 3 random items, I just printed them out at the console, saying whether there were none, two or three matches, and calculating the amount of money won, if there was any, with the given coefficient. It was a good start; I only had to think of the UI, and I suck at UI design. But for this one, all that I needed was a really simple design which I managed to code as I was planning.
For the items to show at slots, I just googled them and found 12 of them in a single sprite. I downloaded the sprite and started my old photo editing software which sometimes can really be magical; Microsoft Paint! I started cropping images from the sprite, paying attention to their dimensions that should be the same, 122px by 114px. Why these magical values? Just because!
What was left to do, was the UI. I could use the really-helpful drag-and-drop UI builder that ships with NetBeans, but I wanted to do it myself. I had a really hard time figuring out which kind of layout to use, since the only one I really knew was GridLayout. Anyway beside that, I managed to use FlowLayout and BorderLayout. There is a difference between them, but I’m not really capable of pointing that out, so you can check the online JavaDoc for them.
I managed to build the game, and started to play it. I figured out that the coefficients for multiplying the bet were too damn high, but I didn’t care as long as I knew that the game worked.
My bad practices
As you can see, the source code of this simple game is in only one file. This is something that I don’t like to do anymore. A better way to do it is by making the code as modular as it can be. By building small modular elements, dividing the UI from the logic of the application, you help yourself during the testing and debugging phase. So the first thing that I would like to change, is dividing the whole class Slots extends JFrame from the class that calls it.
This is done by firstly creating a file called Slots.java that will contain only the code for the UI. Then, creating an ActionListener that will listen to different button clicks (there are 5 different buttons). Finally, creating a class called App.java that will only create a Slots instance and make it run.
Basically, the App.java would look like this:
As I remember, SwingUtilities.invokeLater() is used to divide the UI thread from other threads, so if any UI changes are needed, they won’t stall the application.
Slot Machine Java Code
The Listener class, which might be called something like SlotButtonListener, might be something like this:
And finally, in the Slots class there would be only the code for defining the UI of the game. All the buttons would have SlotButtonListener as action listener.
Slot Machine Simulation Java Program
Anyone who wants to change the code following these advices is free to do it. You can fork it anytime you want.
Do you have any Java programming advice for me? Feel free to comment below