# Perl Programming/Keywords/sqrt

< Perl Programming | Keywords

< Perl Programming | Keywords

Previous: sprintf | Keywords | Next: srand |

`sqrt` returns the positive square root of `EXPRESSION`. If `EXPRESSION` is omitted, `$_` is used instead. Works for non-negative operands, if the `Math::Complex` module has not be loaded.

```
sqrt EXPRESSION
```

Previous: sprintf | Keywords | Next: srand |