# Math

Updated onbyAlan Morel

Java makes working with math straightforward and simple. It offers the usual arithmetic operators you expect, in addition to mathematical functions and properties so that we don't need to implement them ourselves. This lets us focus on the core logic of our application.

Let's dive into some math!

## Arithmetic Operators

Arithmetic operators are what you use to manipulate the value of numerical variables and numbers. Here are the ones you can use:

``````JAVA// adding numbers
int cakes = 5;

int total = cakes + cookies;

System.out.println("Total: " + total);
``````
``````BASHTotal: 12
``````

### Subtraction

``````JAVA// subtracting numbers
int cakes = 14;
int eaten = 7;

int total = cakes - eaten;

System.out.println("Total: " + total);
``````
``````BASHTotal: 7
``````

### Multiplication

``````JAVA// multiplying numbers
int cakes = 3;
int people = 7;

int total = cakes * people;

System.out.println("Total: " + total);
``````
``````BASHTotal: 21
``````

### Division

``````JAVA// dividing numbers
int cakes = 100;
int people = 5;

int total = cakes / people;

System.out.println("Total: " + total);
``````
``````BASHTotal: 20
``````

### Modulus

``````JAVA// modulus operator
int cakes = 100;
int people = 7;

int remainder = cakes / people;

System.out.println("Remainder: " + remainder);
``````
``````BASHTotal: 14
``````

### Order of Operations

Order of Operations, also known as PEMDAS, works just as you would expect, including parentheses:

``````JAVA// order of operations
int result = (5 * 6) + 40 / 2;

System.out.println("Result: " + result);
``````
``````BASHResult: 50
``````

## Math Methods

Java offers many useful math methods for numbers that are commonly used in calculations.

### Absolute Value

Get the absolute number of a number using the

``````JAVAint number = -34;

System.out.println("Number: " + Math.abs(number));

``````
``````BASHNumber: 34
``````

### Floor

Use the `floor` method to round any number down to the nearest whole number:

``````JAVAdouble number = 856.234;

System.out.println("Number: " + Math.floor(number));
``````
``````BASHNumber: 856.0
``````

### Ceiling

Use the `ceil` method to round any number up to the nearest whole number:

``````JAVAdouble number = 856.234;

System.out.println("Number: " + Math.ceil(number));
``````
``````BASHNumber: 857.0
``````

### Natural Logarithm

You can get the natural logarithm of a number using the `log()` function:

``````JAVAint number = 43;

System.out.println("Number: " + Math.log(number));
``````
``````BASHNumber: 3.7612001156935624
``````

### Base-10 Logarithm

You can get the base-10 logarithm of a number using the `log10()` function:

``````JAVAint number = 43;

System.out.println("Number: " + Math.log10(number));
``````
``````BASHNumber: 1.6334684555795864
``````

### Maximum

Get the highest value of a set of numbers using the `max()` function:

``````JAVAint number1 = 53;
int number2 = 64;

System.out.println("Number: " + Math.max(number1, number2));
``````
``````BASHNumber: 64
``````

### Minimum

Get the lowest value of a set of numbers using the `min()` function:

``````JAVAint number1 = 53;
int number2 = 64;

System.out.println("Number: " + Math.min(number1, number2));
``````
``````BASHNumber: 53
``````

### Power

You can calculate the value of one number risen to the power of another number using the `pow` method:

``````JAVAint base = 5;
int exp = 4;

System.out.println("Number: " + Math.pow(base, exp));
``````
``````BASHNumber: 625.0
``````

### Random

You can get a random number between `0` and `1` using the `random()` function:

``````JAVAdouble random = Math.random();

System.out.println("Random: " + random);
``````
``````BASHRandom: 0.5497127671041443
``````

You can then manipulate this value to do other things like getting a random number between two other numbers, like so:

``````JAVAint min = 4;
int max = 29;

double result = (Math.random() * ((max - min) + 1)) + min;

System.out.println("Result: " + result);
``````
``````BASHResult: 9.63955715156336
``````

### Round

You can round a number to the nearest integer with `round()`:

``````JAVAdouble value = 9.63955715156336;

long result = Math.round(value);

System.out.println("Result: " + result);
``````
``````BASHResult: 10
``````

### Square Root

You can take the square root of a number using the `sqrt()` function:

``````JAVAint value = 245;

double result = Math.sqrt(value);

System.out.println("Result: " + result);
``````
``````BASHResult: 15.652475842498529
``````

That's all we got for math! ๐ค๐ค๐ค

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