# Operators

**Operators** are used to perform specific mathematical or logical functions on data, often stored in variables. PowerShell offers multiple types of operators to manipulate data including:

- Arithmetic Operators
- Assignment Operators
- Unary Operators
- Equality Comparison Operators
- Logical Operators

## Arithmetic Operators

PowerShell arithmetic operators are used to calculate numeric values. These include:

Operator | Name | Description |
---|---|---|

`+` |
Addition | Adds numbers, concatenates strings and arrays. |

`-` |
Subtraction | Subtracts or negates numbers. |

`*` |
Multiplication | Multiplies numbers or copies strings and arrays a specified number of times. |

`/` |
Division | Divides numbers. |

`%` |
Modulo | Returns the remainder of a division operation. |

Arithmetic operators are binary operators, which means they act on two operands. Their syntax in PowerShell is `<Operand_1> <Arithmetic Operator> <Operand_2>`

.

$x = 5 + 5# x is now 10$x = $x - 8# x is now 2$x = $x * 3# x is now 6$x = $x / 2# x is now 3$x = $x % 2# x is now 1

Arithmetic operators, `+`

and `*`

, also work on strings and arrays.

PS > $best_learning_platform = "Code" + "cademy"PS > $best_learning_platform + "!" * 3Codecademy!!!

PS > $fibonacci_1 = 0, 1, 1PS > $fibonacci_2 = 2, 3, 5PS > $fibonacci_1 + $fibonacci_2011235PS > $fibonacci_2 * 2235235

## Assignment Operators

Assignment operators can be used to assign, change, or append values to variables. These operators are a shorter syntax for assigning the result of an arithmetic operator. The general syntax of the assignment operators is: `<Variable> <Assignment Operator> <Value>`

.

Operator | Name | Description |
---|---|---|

`=` |
Assignment | `$x = 3` assigns value `3` to variable `x` . |

`+=` |
Addition Compound Assignment | `$x += 3` is short for `$x = $x + 3` . |

`-=` |
Subtraction Compound Assignment | `$x -= 3` is short for `$x = $x - 3` . |

`*=` |
Multiplication Compound Assignment | `$x *= 3` is short for `$x = $x * 3` . |

`/=` |
Division Compound Assignment | `$x /= 3` is short for `$x = $x / 3` . |

`%=` |
Modulo Compound Assignment | `$x %= 3` is short for `$x = $x % 3` . |

### Example

PS > $number = 4PS > $number += 6 # $number is now 10PS > $number /= 2 # $number is now 5PS > $number5

## Unary Operators

Unary operators increase or decrease the value of a variable by 1.

Operator | Name | Description |
---|---|---|

`++` |
Increment | `$x++` is short for `$x = $x + 1` . |

`--` |
Decrement | `$x--` is short for `$x = $x - 1` . |

## Equality Comparison Operators

Equality operators in PowerShell are binary operators that compare two integer or string values that return `True`

if the operator condition is met, otherwise `False`

.

Operator | Name | Description |
---|---|---|

`-eq` |
Equal | `$x -eq $y` is `True` if `x` and `y` are equal. |

`-ne` |
Not Equal | `$x -ne $y` is `True` if `x` and `y` are not equal. |

`-gt` |
Greater Than | `$x -gt $y` is `True` if `x` is greater than `y` . |

`-lt` |
Less Than | `$x -lt $y` is `True` if `x` is less than `y` . |

`-ge` |
Greater Than or Equal to | `$x -ge $y` is `True` if `x` is greater than or equal to `y` . |

`-le` |
Less Than or Equal to | `$x -le $y` is `True` if `x` is less than or equal to `y` . |

## Logical Operators

Logical operators allow us to combine multiple operator expressions and statements into complex conditionals. They operate on boolean values and return boolean values.

Operator | Name | Description |
---|---|---|

`-and` |
And | `$x -and $y` is `True` only if `$x` and `$y` are both `True` . |

`-or` |
Or | `$x -or $y` is `True` if either `$x` or `$y` is `True` . |

`-xor` |
Xor | `$x -xor $y` is `True` if only, but not both, `$x` or `$y` is `True` . |

`!` or `-not` |
Not | `!$x` is `True` when `$x` is `False` and `False` when `$x` is `True` . |

## Operator Precedence

Precedence order is the order in which PowerShell evaluates the operators if multiple operators are used in the same expression. Operator precedence in PowerShell is as follows:

- Parentheses:
`( )`

- Unary operators:
`++`

,`--`

`!`

,`not`

- Arithmetic operators:
`*`

,`/`

,`%`

,`+`

,`-`

- Comparison operators:
`-eq`

,`-ne`

,`-gt`

,`-ge`

,`-lt`

,`-le`

`-and`

,`-or`

,`-xor`

- Assignment operators:
`=`

,`+=`

,`-=`

,`*=`

,`/=`

,`%=`

## Examples

PS > $num_1 = 4PS > $num_2 = 3PS > $num_1 -lt $num_2 # num_1 is not less than num_2FalsePS > $num_2++ # num_2 is now 4PS > $num_1 -ge $num_2 # num_1 is greater than or equal to num_2TruePS > $num_1 /= 2 # num_1 is now 2PS > $num_1 -lt $num_2 -xor $num_1 -ge $num_2 # True because only one expression is TrueTrue

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