Operators

Operators are symbols used to perform data manipulation and assignment. They allow us to perform math with our variables and change what values are stored in them. Operators only work with specific types. For example, you can't multiply a String.

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Arithmetic

Arithmetic operators allow us to perform math operations with variables and numbers. Below is a list of the basic operators. You can see most operators are compatible with all number datatypes, but String is only compatible with the + operator. They should all do what you expect from your 2nd grade math class. The only thing that may be unique is the modulo operator %. This is used to calculate the remainder of dividing two numbers.

Operator	Description	Compatible Datatypes	Example
+	Addition	int, double, String	1 + 1 = 2 1.5 + 1.0 = 2.5 "MARS" + "WARS" = "MARSWARS"
-	Subtraction	int, double	2 - 1 = 0 2.5 - 0.5 = 2.0
*	Multiplication	int, double	9 * 3 = 27 15 * 0.5 = 7.5
/	Division	int, double	9 / 3 = 3 8.0 / 3.0 = 2.6666
%	Modulo	int, double	10 % 3 = 1 8.5 % 3.0 = 2.5

Data truncation

Be careful when performing math between an int and a double. You cannot store decimal precision data in an int datatype. Any decimal precision will be truncated.

int i = 5;
double d = 0.5;

int product = i * i; // product = 25
int product = i * d; // product = 2
double product = i * d; // product = 2.5

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Assignment

You should be familiar with the = operator by now, but there are several more assignment operators that we can use in our code. Below is a table which shows most of the available assignment operators.

Operator	Description	Example	Equivalent Expression
=	Assignment	int x = 0; // Assigns a value (right side) to a variable (left side) </td>	int x = 0;
+=	Addition Assignment	int x = 1; x += 1; // x is now 2	x = x + 1;
-=	Subtraction Assignment	double x = 3.14; x -= 0.14; // x is now 3.0	x = x - 0.14;
*=	Multiplication Assignment	int x = 2; x *= 6; // x is now 12	x = x * 6;
/=	Division Assignment	int x = 9; x /= 3; // x is now 3	x = x / 3;