ATN

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgAtn
• Last revised: 2018-04-16

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Returns the arctangent of a number

Syntax

` declare function Atn ( byval number as double ) as double

`

Usage

` result = Atn( number )

`

Parameters

number

A number.

Return Value

The angle, in radians, whose tangent is number, in the range [-Pi/2..Pi/2].

Description

Atn returns the arctangent of the argument number as a Double within the range of -Pi/2 to Pi/2. The arctangent is the inverse of the Tan function. The returned angle is measured in radians (not degrees).

Atn can be overloaded as operator to accept user-defined types.

Examples

start GeSHi

Print "Pi ="; Atn ( 1.0 ) * 4
Print Atn ( 4 / 5 )

end GeSHi

The output would be:

Pi = 3.141592653589793
0.6747409422235527

Differences from QB

• None

See also

• Tan
• ATan2
• A Brief Introduction To Trigonometry

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