What Am I Doing Wrong!!!!!!!!!!!!!!!! Help!!!!!!!!!!! Urgent

[Krocker]

Can some one help me, what am i doing wrong. i keep getting an error and i dont understand http://compsci.ca/v3/images/smiles/icon_question.gif . the following is my coding/program:


import GUI

setscreen ("graphics:550;150")

% Tells what the button has to do
procedure Simplepressed
Sys.Exec ("Simple.exe")
end Simplepressed

procedure Compoundpressed
Sys.Exec ("Compound.exe")
end Compoundpressed

% Gives the buttons a variable and creates the button
var button1 : int := GUI.CreateButton (140, 60, 2, "SIMPLE", Simplepressed)
var button2 : int := GUI.CreateButton (20, 60, 2, "COMPOUND", Compoundpressed)

% Intro Statement to the program
put "WELCOME TO KB INTEREST CALCULATOR"
colour (3)
put "PLEASE CHOOSE ONE OF THE FOLLOWING TYPES OF INTERESTS"

loop
exit when GUI.ProcessEvent
end loop

[TerranceN]

Next time say what error you are getting, but I'm guessing you get the error:

"Expression is not a procedure and hence cannot be called"

I don't understand why, but from reading the documentation, they always use Sys.Exec in a if statement, which works properly. So instead of

Turing:

Sys.Exec("\\.\\Windows\\System32\\notepad.exe")

use

Turing:

if Sys.Exec("\\.\\Windows\\System32\\notepad.exe") then end if

which you can even use for error handling

Turing:

if ~Sys.Exec("\\.\\Windows\\System32\\notepad.exe") then     put "Error: "..     put Error.LastMsg() end if

Does anyone know specifically why you get that cryptic error? Why wouldn't Holtsoft just make it a procedure instead of having that error?

[TheGuardian001]

TerranceN @ Wed Nov 03, 2010 6:03 pm wrote:

"Expression is not a procedure and hence cannot be called"

I don't understand why, but from reading the documentation, they always use Sys.Exec in a if statement, which works properly

Turing enforces the difference between Functions and Procedures. If the method is stated to return a value, you MUST use that value, whether it is by assigning it to a variable, using it in a conditional, etc. It's the same reason turing uses "exit when GUI.ProcessEvent()" instead of just "GUI.ProcessEvent"

This specific method is a function because it returns a value indicating success/failure. I suppose they chose to do that because you're launching something outside of your own program, and will probably want to know if that program was successfully launched or not.