# Atan Procedure

Returns the arc tangent of the number, in radians.

Warning: The input number is internally converted to a less precise

64-bit binary floating-point format.
The result is computed in this format and then converted back to TMBASIC's

128-bit decimal floating-point format.
These conversions may cause a loss of precision.

Declaration

function Atan(x as Number) as Number

### Parameters

### Return value

Number — Arc tangent of

*x*.

### Example

Code

Output

0.2449786631268641434733268624768242