Kbase 18114: How to Call WIN32 API Function: Atan (Arctangent)
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
01/07/2009 |
|
Status: Verified
GOAL:
How to Call WIN32 API Function: Atan (Arctangent)
FACT(s) (Environment):
Windows 32 Intel
Windows NT 32 Intel/Windows 2000
FIX:
The following sample code shows how to call the Win32 trigonometric function called Atan which resides in the Microsoft Visual C++ runtime library called MSVCRT40.DLL. This function returns the arctangent of an angle in radians.
DEFINE VARIABLE decResult AS DECIMAL NO-UNDO.
PROCEDURE atan EXTERNAL "MSVCRT40.DLL" CDECL:
DEFINE INPUT PARAMETER dblValue AS DOUBLE NO-UNDO.
DEFINE RETURN PARAMETER dblResult AS DOUBLE NO-UNDO.
END PROCEDURE.
RUN atan (INPUT 0.655, OUTPUT decResult).
MESSAGE "The Arctangent of 0.655 is " decResult VIEW-AS ALERT-BOX.