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Logical operators are used to combine two or more conditions.

Logical Operators

The `not` logical operator is denoted by `!`.

It reverses the `bool` outcome of the expression that immediately follows.

Here's the truth table:

| a | !a |
| --- | --- |
| false | true |
| true | false |

<br>

For instance:

- `( !true )` returns `false`
- `( !false )` returns `true`
- `( !(10 < 11) )` returns `false`

**Note:** The keyword `not` can be used in the place of `!`.


Logical Operator: !

The `or` logical operator is denoted by `||`.

It returns `true` when the condition on the left is `true` _or_ the condition on the right is `true`. Only one of them needs to be `true`.

Here's the truth table:

| a | b | a \|\| b |
| --- | --- | --- |
| false | false | false |
| false | true | true |
| true | false | true |
| true | true | true |

<br>

For instance:

- `( 1 < 2 || 2 > 3 )` returns `true`
- `( 1 > 2 || 2 > 3 )` returns `false`

**Note:** The keyword `or` can be used in the place of `||`.

Logical Operator: II

Awesome! In this mini-lesson, we've added more operators to our toolbox:

- `&&`: the `and` logical operator
- `||`: the `or` logical operator
- `!`: the `not` logical operator


Review

The `and` logical operator is denoted by `&&`. 

It returns `true` if the condition on the left _and_ the condition on the right are both `true`. Otherwise, it returns `false`.

Here's the truth table:

| a | b | a && b |
| --- | --- | --- |
| false | false | false |
| false | true | false|
| true | false | false|
| true | true | true |

<br>

For instance:

- `( 1 < 2 && 2 < 3 )` returns `true`
- `( 1 < 2 && 2 > 3 )` returns `false`

**Note:** The keyword `and` can also be used in the place of `&&`.

Logical Operator: &&

Often, when we are trying to create a control flow for our program, we'll encounter situations where the logic cannot be satisfied with a single condition.

[_Logical operators_](https://www.codecademy.com/resources/docs/cpp/operators?page_ref=catalog) are used to combine two or more conditions. They allow programs to make more flexible decisions. The result of the operation of a logical operator is a `bool` value of either `true` or `false`.

There are three logical operators that we will cover:

- `&&`: the `and` logical operator
- `||`: the `or` logical operator
- `!`: the `not` logical operator

We will also discuss the order of operations.
 
Let's get started!