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- Clojure - Discussion

An **operator** is a symbol that tells the compiler to perform specific mathematical or logical manipulations.

Clojure has the following types of operators −

- Arithmetic operators
- Relational operators
- Logical operators
- Bitwise operators

**Note** − In Clojure, operators and operands work in the following syntax manner.

(operator operand1 operand2 operandn)

For example,

(+ 1 2)

The above example does an arithmetic operation on the numbers 1 and 2.

Clojure language supports the normal Arithmetic operators as any language. Following are the Arithmetic operators available in Clojure.

Operator | Description | Example |
---|---|---|

+ | Addition of two operands | (+ 1 2) will give 3 |

− | Subtracts second operand from the first | (- 2 1) will give 1 |

* | Multiplication of both operands | (* 2 2) will give 4 |

/ | Division of numerator by denominator | (float (/ 3 2)) will give 1.5 |

inc | Incremental operators used to increment the value of an operand by 1 | inc 5 will give 6 |

dec | Incremental operators used to decrement the value of an operand by 1 | dec 5 will give 4 |

max | Returns the largest of its arguments | max 1 2 3 will return 3 |

min | Returns the smallest of its arguments | min 1 2 3 will return 1 |

rem | Remainder of dividing the first number by the second | rem 3 2 will give 1 |

Relational operators allow comparison of objects. Following are the relational operators available in Clojure.

Operator | Description | Example |
---|---|---|

= | Tests the equality between two objects | (= 2 2) will give true |

not= | Tests the difference between two objects | (not = 3 2) will give true |

< | Checks to see if the left object is less than the right operand | (< 2 3) will give true |

<= | Checks to see if the left object is less than or equal to the right operand | (<= 2 3) will give true |

> | Checks to see if the left object is greater than the right operand | (> 3 2) will give true |

>= | Checks to see if the left object is greater than or equal to the right operand | (>= 3 2) will give true |

Logical operators are used to evaluate Boolean expressions. Following are the logical operators available in Groovy.

Operator | Description | Example |
---|---|---|

and |
This is the logical “and” operator | (or true true) will give true |

or |
This is the logical “or” operator | (and true false) will give false |

not |
This is the logical “not” operator | (not false) will give true |

The following code snippet shows how the various operators can be used.

Clojure provides four bitwise operators. Following are the bitwise operators available in Clojure.

Sr.No. | Operator & Description |
---|---|

1 |
This is the bitwise “and” operator |

2 |
This is the bitwise “or” operator |

3 |
This is the bitwise “xor” or Exclusive ‘or’ operator |

4 |
This is the bitwise negation operator |

Following is the truth table showcasing these operators.

p | q | p&q | p | q | p ^ q |
---|---|---|---|---|

0 | 0 | 0 | 0 | 0 |

0 | 1 | 0 | 1 | 1 |

1 | 1 | 1 | 1 | 0 |

1 | 0 | 0 | 1 | 1 |

As is the case with LISPs in general, there is no need to worry about operator precedence. This is one of the benefits of S-Expressions and prefix notation. All functions evaluate left to right and inside out. The operators in Clojure are just functions, and everything is fully parenthesized.

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