DOCUMENT:Q130128 09-FEB-2000 [foxpro] TITLE :PRB: MOD Function w/ Negative Number May Give Different Answer PRODUCT :Microsoft FoxPro PROD/VER:WINDOWS:3.0 OPER/SYS: KEYWORDS:kbcode ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual FoxPro for Windows, version 3.0 ------------------------------------------------------------------------------- SYMPTOMS ======== If negative numbers are used with the MOD function, it is possible that the answer returned will be different from the answer given by other applications that also incorporate a MOD function. CAUSE ===== The correct definition of MOD is as follows: x MOD y = z where z + y * int(x/y) = x z = x - y * int(x/y) Therefore: x MOD y = x - y * int(x/y) In the Microsoft MOD function, we do the same as above except we use the FLOOR() function instead of INT() in order to be backward compatible with other products that use the FLOOR() function. RESOLUTION ========== Below are two functions. The first function (FLOORMOD) implements the MOD with a FLOOR() function, and the second function (INTMOD) implements the MOD with an INT() function. Sometimes you may want to use the INTMOD function. **** MOD with FLOOR() **** FUNCTION FLOORMOD PARAMETER x,y z = x - FLOOR(x/y)*y RETURN z ************************** **** MOD with INT() ****** FUNCTION INTMOD PARAMETER x,y z = x - INT(x/y)*y RETURN z ************************** STATUS ====== This behavior is by design. Additional query words: VFoxWin ====================================================================== Keywords : kbcode Technology : kbVFPsearch kbAudDeveloper kbVFP300 Version : WINDOWS:3.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.