Q(uick)BASIC Function: TAN

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TAN Function

A math function that returns the tangent of an angle expressed in radians

Worth knowing

Useful and cross-version information about the programming environments of QBasic and QuickBasic.

ASCII Code Tables
Keyboard Scan Codes
Syntax Conventions
Screen Modes, Adapters, Displays, Colors
BASIC Character Set
Error Codes

Syntax

ATN(numeric-expression)
COS(angle)
SIN(angle)
TAN(angle)

Description/Parameter(s)

numeric-expression	The ratio between the sides of a right triangle.
angle	An angle expressed in radians.

The ATN function returns an angle in radians.

To convert from degrees to radians, multiply degrees by (PI / 180).

Example

CONST PI=3.141592654
PRINT ATN(TAN(PI/4.0)), PI/4.0    'Output is:  .7853981635  .7853981635
PRINT (COS(180 * (PI / 180)))     'Output is:  -1
PRINT (SIN(90 * (PI / 180)))      'Output is:  1
PRINT (TAN(45 * (PI / 180)))      'Output is:  1.000000000205103