Arithmetic operators are used to perform basic arithmetic operations. Operations like addition, subtraction, multiplication, division and modulo division.

C supports five arithmetic operators.

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

`+` | Unary plus or binary addition |

`-` | Unary minus or binary subtraction |

`*` | Multiplication |

`/` | Division |

`%` | Modulo division (Evaluates remainder) |

**Important Note:** There is no exponential operator in C programming language. Many beginners considers `^`

(hat symbol) as an exponential operator. However, `^`

is a bitwise XOR operator.

## Unary plus and unary minus

The `+`

and `-`

arithmetic operators exhibits in two variants unary plus/minus and binary addition/subtraction. Unary plus and minus takes single operand and used to alter the sign of a real or integer type.

**For example: **

```
a = -5; // a contains -5
b = +10.65; // b contains +10.65
c = -a; // c contains -(-5) => +5
d = -b; // d contains –(+10.65) => -10.65
```

By default, every real or integer type is positive. Therefore, use of unary plus operator is optional. Means `b = +10.65;` is equivalent to `b = 10.65;`.

## Binary arithmetic operators

Binary arithmetic operator are used to perform basic arithmetic operations. It accepts two operand.

Suppose two integer variables `x` and `y` with initial values

`int x=10, y=6;`

After performing following binary arithmetic operations.

```
x + y = 16
x - y = 4
x * y = 60
x / y = 1 (Integer division evaluates to integer trimming fractional part)
x % y = 4 (Remainder of the integer division)
```

## Integer division

In computer programming divisions are performed differently. Apparently there are two types of division.

- Integer division
- Real division

C performs integer division if both operands are integer type. Integer division always evaluates to an integer discarding the fractional part.

C performs real division if any of the two operands are real type (either `float`

or `double`

). Real division evaluates to a real value containing integer as well as fractional part.

Consider the below division table for a clear view of division in C.

Operation | Result | Division type |
---|---|---|

5 / 2 | 2 | Integer division |

5.0 / 2 | 2.5 | Real division |

5 / 2.0 | 2.5 | Real division |

5.0 / 2.0 | 2.5 | Real division |

## Modulo division

Modulo division evaluates remainder after performing division of two numbers. In C programming, we perform modulo division using `%`

operator. Many texts refers modulo operator as modulus operator.

Consider the below modulo division table for a clear view of modulo division operations in C.

Operation | Result |
---|---|

8 % 2 | 0 |

5 % 3 | 2 |

3 % 7 | 3 |

-3 % 7 | -3 |

5 % -2 | 1 |

-8 % -3 | -2 |

2.5 % 2 | Error |

8 % 2.5 | Error |

5.0 % 2.5 | Error |

**Important note:**

- Modulo division is only possible with integer operands. It causes compilation error with float types.
- Modulo operator returns sign of the first operand.

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