Re: [tlaplus] TLC tool Help

[Stephan Merz <stephan.merz@xxxxxxxxx>]

TLA+ is mainly intended for describing state machines. You apparently want to specify functional expressions. A syntactically correct version of your definition (ignoring leap years) could be represented as follows in TLA+:

-------- MODULE Test ---------

IsDayOfMonth(m,d) ==

  IF m = 2 THEN d = 28

  ELSE IF m \in {1,3,5,7,8,10,12} THEN d \in 1 .. 31

  ELSE d \in 1 .. 30

=======================

Using the Toolbox, you can check such a definition by creating a model, checking the box "No Behavior Spec" in the Model Overview pane, then switch to the "Model Checking Results" pane and enter expressions such as

IsDayOfMonth(7, 30)       or       IsDayOfMonth(2, 30)

in the "_expression_" field of the sub-window "Evaluate Constant _expression_". Clicking on the triangle on green background makes TLC evaluate the _expression_ and display the result.

Evaluating constant expressions in this way is useful for debugging your specification, but it is not what TLA+ is mainly useful for.

Regards,

Stephan

On 29 Jun 2019, at 13:40, MK Bug <android.ruba@xxxxxxxxx> wrote:

Hi,

I am new in TLA+, I want to write specification in TLA+ but the issue is I am confused about the tool TLC. 

My specification is as follows (without keeping in view the syntax just sharing you the logic)

For example:

---------------------------------------------------------------------

 Constant Month, Day

if Month \in 1,3,5,7,8,10,12 then

 1<Day<31

else

1<Day<30

end if

----------------------------------------------------------------------

Above is the specification but I am confused in Model where should i write this.

1) What is the behavior spec? in single Formula?

or

2) What to check? in Properties?

Please do share the understanding or difference between these, if possible.

I have already searched this here => https://tla.msr-inria.inria.fr/tlatoolbox/doc/model/overview-page.html

But still confused.

Thanks,

Malaika

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