Val3: no way to create a function to return a value ?

    I am not new to programming but am to Val3. I hope I am just missing something in that I can't return a value from a call or create a function in the language. So, I can only call programs and set a value in that to a global variable to be accessed after the program call ? eg. I'd like to return a bool for a home check:

    if check_home() != true

    // fault handling

    endIf

    vs.

    // check_home internally sets bAtHome to true if near home position

    call check_home()

    if bAtHome != true

    // fault handling

    endIf

    Am I missing something ? Returning a value seems basic to me and Val3 seems to have common language constructs. I hope it is my inexperience with the language that I'm missing something.

    I see a way to create an application and package as a "library", but no mechanism for return values either. Is there a SDK to extend the language or create drivers/plugins ?

    Thanks for any info !

    Hi,

    I do not know too much about val3. But I think knowing a little bit about procedures and functions.

    How did you programmed your function?

    in val3 procedures start with

    procedure and name of procedure and maybe a couple of parameter

    to call the procedure you would write

    call name of procedure (see your example).

    In order to create a funtion with return code you would write

    bool check_home()

    In some languages you also could call the function like a procedure if you do not care about the return code

    regards

    MOM

    Hello prisonprime,

    in VAL3, if you don't want to use the way you wrote with global variables, you have to use parameters by reference in order to have a return value.

    The programm should have a bool parameter by reference: check_home(bool& x_bAtHome)

    Then you can call the sub programm with the parameter as a return value.

    call check_home(bAtHome)

    The difference between theory and practice is greater in practice than in theory.

Advertising from our partners