**Introduction**

A *relational operator* is an operator that tests a relation between two entities. The result of a relational operator is either true or false.

**‘1’**and false is represented by

**‘0’**.

There are 6 relational operators in Arduino IDE:

Relational Operators | Operator Symbol | Example |
---|---|---|

Greater than | > | currentYear > 2015 |

Less than | < | 2015 < currentYear |

Greater than or equal to | >= | currentYear >= 2017 |

Less than or equal to | <= | 2017 <= currentYear |

Equal to | == | centuryYear == 2000 |

Not equal to | != | centuryYear != 1999 |

**Greater than (>)**

It results in true *only* if the first number is greater than the second number. If the first number is equal to or less than the second, it results in false. Given below is an example:

The result of the operation will be:

`Is 7 greater than 4: 1 `

`Is 7 greater than 10: 0`

## Less than (<)

It results in true *only* if the first number is less than the second number. If the first number is equal to or greater than the second, it results in false. Given below is an example:

The result of the operation is:

`Is 7 less than 4: 0`

`Is 7 less than 10: 1`

**Greater than or equal to (>=)**

It results in true if the first number is either greater than *or* equal to the second number. If the first number is less than the second, it results in false. Given below is an example:

The result of the operation is:

`Is 7 greater than or equal to 10: 0`

`Is 7 greater than or equal to 7: 1`

**Less than or equal to (<=)**

It results in true if the first number is either less than *or* equal to the second number. If first number is greater than the second, it results in false. Given below is an example:

The result of the operation is:

`Is 7 less than or equal to 4: 0`

`Is 7 less than or equal 7: 1`

**Equal to (==)**

It results in true *only* if the first number is equal to the second number; otherwise, it results in false. Given below is an example:

The result of the operation is:

`Is 7 equal to 10: 0`

`Is 7 equal to 7: 1`

**Not equal to (!=)**

It results in true if the first number is *not *equal to the second number; otherwise, it results in false. Given below is an example:

The result of the operation is:

`Is 7 not equal to 10: 1`

`Is 7 not equal to 7: 1`