# signif

signif(x, digits, [base])

Rounds (in the sense of `round`) `x` so that there are `digits` significant digits, under a base `base` representation, default 10. E.g., `signif(123.456, 2)` is `120.0`, and `signif(357.913, 4, 2)` is `352.0`.

## Examples

In the Julia programming language, the function `signif(x, digits, [base])` is used to round the value `x` to a specified number of significant digits, considering an optional base representation. The rounded value is returned.

1. Round to 2 significant digits:

``````julia> signif(123.456, 2)
120.0``````

This example rounds the number 123.456 to 2 significant digits, resulting in 120.0.

2. Round to 4 significant digits with a base of 2:
``````julia> signif(357.913, 4, 2)
352.0``````

Here, the number 357.913 is rounded to 4 significant digits using a base of 2, resulting in 352.0.

Common mistake example:

``````julia> signif(10.0, -2)
ERROR: DomainError with -2:
The number of digits must be non-negative``````

In this example, a negative value is provided for the `digits` argument, which results in a `DomainError`. It's important to ensure that the number of digits is non-negative when using the `signif` function.