Replacing of #define in C++ for LabVIEW

[javadi_ali]

In C++ we define our constant values or macros with this compiler preprocessor "#define".

What is in LabVIEW for replacing this subject?

fore example  in C++:

#define  Item_Value     3.345

#define  XY                   x*y

and ...

what instanse is suitable in labview for above macros?

In C++ I can easily change my definitions for example "#define Item_Value    6.517"  and it change in total of my program but In LabVIEW how I can do it?

thanks

[tst]

The closest thing is the conditional disable structure, which allows you to set a symbol in your project and use that to decide which piece of code will execute, but you can also easily do this by having a VI output the value or by using a global variable to output the value. Both will require you to create more files, though.

[MScap]

hi

i did not understand how a conditional disable structure helps in thsi case!

using global vis is fair enough!!

kindly explain the usage of conditional disable structure!

[tst]

If I understand correctly, a conditional disable structure is more similar to #ifdef than to #define, but you can do something like this:

1. Create the structure.
2. Create as many frames in the structure as you like, one for each "value".
3. Change the value in the project.

It's not the best solution for something like this, but it has some advantages. As mentioned, the static global variable or the subVI is closer in spirit to #define.