evaluating .t.

[spuppett]

A quick question:

does .t. evaluate to and integer? (non-zero) I don't really know how to test it in VFP. I tried 'say .t. <> 0', but got a type mis-match.

Thanks

 

[TamarGranor]

No. In VFP, .T. and .F. are logical values. To test them, you just need to use them:

IF .T.
  * do something
ENDIF

Similarly, if you have a logical variable or field, you don't have to compare it to .T. or .F. explicitly:

IF lCondition
  * do something
ENDIF

IF NOT lCondition
  * do something
ENDIF

Tamar

 

[jimstarr]

.T. is data type Logical and doesn't evaluate to any numeric data type. It can be compared only to another Logical field/expression.

Jim

 

[craigsboyd]

Not completely on topic, but close. In VFP9 you can use the cast function with logical values to receive 1 or 0...

?CAST(.T. as Integer)
?CAST(.F. as Integer)

http://www.sweetpotatosoftware.com

 

[StewartUK]

Another point, also nearly on topic - EMPTY(.F.) returns TRUE and empty(.T.) returns FALSE.

This is handy when you want to check the value of a checkbox as you don't need to check the data type first.

Hope that helps,

Stewart
PS If you want to get the best response to a question, please check out FAQ184-2483 first.

 

[alvechurchdata]

This is handy when you want to check the value of a checkbox

As long as you remember that it'll give you .F. if the checkbox is in its indeterminate state.

Geoff Franklin

http://www.alvechurchdata.co.uk