PRB: Conditional IF Incorrectly Evaluates as True

ID: Q114789

The information in this article applies to:

Microsoft FoxPro for Windows, versions 2.5x, 2.6, 2.6a
Microsoft FoxPro for MS-DOS, versions 2.0, 2.5x, 2.6, 2.6a
Microsoft FoxPro for Macintosh, versions 2.5b, 2.5c

SYMPTOMS

If you use the following conditional statement, which has a mistyped AND condition, the latter parts of the conditional are treated as comments, which causes the overall expression to evaluate erroneously:

   IF X=.T. AMD Y=.T.

This line will evaluate as true even if Y=.F.

CAUSE

FoxPro looks at "AMD", decides it is not "AND" or "OR", and assumes it is the beginning of a comment. It therefore stops evaluating the expression, which makes FoxPro see the expression as:

   IF X=.T. &&AMD Y=.T.

MORE INFORMATION

FoxPro allows comments without "&&" at the end of some commands. This behavior is not expected to change in the future.

To find typing errors in FoxPro for Windows, you can use the spelling checker by choosing Spelling from the Text menu.

Additional reference words: FoxMac FoxDos FoxWin 2.00 2.50 2.50a 2.50b 2.50c 2.60 ANS ANF ANE typo misspelling 2.60a KBCategory: kbprg kbprb KBSubcategory: FxprgGeneral

Last Reviewed: June 27, 1995