List of BlockScript Symbols

[Fence]

Where can I find a list of the predefined symbols in BlockScript please? I have seen that 'false' is a symbol from the examples but can find no list in the manual. Also are all symbol names case insensitive?

Many thanks.

[Wasntme]

Hi Fence,

This manual I have linked to below should hopefully be able to provide you with the information you are looking for,

http://digital.ni.com/manuals.nsf/websearch/35ACE8E8DCDE3D2F86256E5B00757D62?opendocument

Let me know if this has the answers you seek.

Best regards,

[Fence]

Thanks for your response.

The link you posted took me to the BlockScript Users manual. A search for 'False' showed me the same three references that I found in my local copy of that manual. There is no list of definitions, just the use of word in explanations of environment variables and an example. A search for true yielded similar results.

Somewhere there should be a list of such symbols and how the BlockScript interpreter recognises and treats them.

Regards,
Tim

[Carl L.]

Tim,
I agree and have submitted feedback that we need to improve the BlockScript documentation on this point. In the mean time here is some information that would be useful.

BlockScript is strict on datatypes. So you could not assign a integer or float to a logical:
LOGICAL abc;
abc = 1;
That is where the TRUE and FALSE literals come in to use. They are of the datatype LOGICAL. In C the datatype for logical is the same as numeric, where as Ada has a seperate datatype. Since BlockScript can be generated into both Ada and C code we need to use the stricter of the two.

Another thing to note with datatypes is that BlockScript will do implicit datatyping for INTEGER and FLOAT datatypes, where as LOGICAL needs an explicit definition. If you assign a number to a variable ( a = 2342 ) then if it does not have any decimal point (2.344) or exponential part (2e-3) then it is seen as an integer. If it has decimal point or exponent then it is typed as a float.

Both the e for the exponent and the TRUE and FALSE literals are not case-sensitive.

Carl L
National Instruments
www.ni.com/matrixx

Message Edited by Carl L. on 04-26-2005 01:27 PM

[Fence]

Carl,

Many thanks for your answer and explanation.
I assume from your answer that there are only the two symbols 'true', 'false'.

Thanks,
Tim

[Carl L.]

Tim,
There is also PI and EPSILON. They are documented in the Environment Variables section. To use them you have to define them as an environment variable. If they are not defined then they can be used as anything. This is an example of defining PI.

outputs: y;
environment: PI;

y = PI;

Carl L
National Instruments
www.ni.com/matrixx