procedure problems

[Mr. T]

everytime i use a procedure, the variables inside the procedure (ints) continue at the number where they left off...how would i make the numbers reset themselves?

[person]

do something like

var x: int := 0

[Mr. T]

person wrote:

do something like

var x: int := 0

i did that a that the beginning of my prog, do i haveta write it each time i use the procedure?!?!

[Chaos_Theory]

Pwned wrote:

person wrote:

do something like

var x: int := 0

i did that a that the beginning of my prog, do i haveta write it each time i use the procedure?!?!

no put it as teh first line of teh prcedure, thatw ay everytime teh procedure is run, it will reset to 0

[Mr. T]

thnx

[basketball4ever]

to have good form in a program, you need local and global variables.

A local variable is a variable inside a procedure, while a global is outside. You ONLY use global variables if the variable is used in more than one procedure. So if you're thing has more than once using whatever variable you're using... set it as global then in the beginning of each procedure that you need it to reset... do this:

code:

%you're global variables var yourvariable : int :=0 proc examplenum1 yourvariable := 0 %ur code end examplenum1

[md]

actually you should only use global varialbes if there is no way you could write hte program without them, it is espetially important to keep loop variables local though.

[wtd]

basketball4ever wrote:

You ONLY use global variables if the variable is used in more than one procedure.

Bzzzzt! Wrong! But thank you for playing our game.

This is where you should be using argument passing.

code:

procedure greeting (name : string)    put "Hello " + name end greeting procedure parting (name : string)    put "Bye " + name end parting var test_name : string := "Bob" greeting (test_name) parting (test_name)

[Token]

well considering that you usually use a procedure to execute a large group of code just put in the beginning of the procedure x:= 0 for example

code:

var y, add, c : int procedure background     y := 0     add := 0     c := 0     loop         for i : 1 .. maxx - 50             c := c + 1             drawfillbox (i + add, y, i + add + 50, y + 50, red + c)             add := add + 50             delay (50)         end for     end background     background

so now each time you run background it resets color and add

[basketball4ever]

wtd wrote:

basketball4ever wrote:

You ONLY use global variables if the variable is used in more than one procedure.

Bzzzzt! Wrong! But thank you for playing our game.

This is where you should be using argument passing.

code:

procedure greeting (name : string)    put "Hello " + name end greeting procedure parting (name : string)    put "Bye " + name end parting var test_name : string := "Bob" greeting (test_name) parting (test_name)

yeh... and ur using the var test_name more than one procedure... i dont get what you're saying mr.wtd

[wtd]

basketball4ever wrote:

wtd wrote:

basketball4ever wrote:

You ONLY use global variables if the variable is used in more than one procedure.

Bzzzzt! Wrong! But thank you for playing our game.

This is where you should be using argument passing.

code:

procedure greeting (name : string)    put "Hello " + name end greeting procedure parting (name : string)    put "Bye " + name end parting var test_name : string := "Bob" greeting (test_name) parting (test_name)

yeh... and ur using the var test_name more than one procedure... i dont get what you're saying mr.wtd

No, I'm passing the value of "test_name" into each of those procedures. The prodedure itself knows nothing about the outside world, which is exactly the way it should be.

When I write:

code:

procedure greeting (name : string)    put "Hello " + name end greeting

And then look at this, I don't need to look outside the procedure to understand it. I know that it gets a string, which it calls "name", tacks "Hello " onto the front of that name, then prints it to the screen.

If I want to use this procedure elsewhere, I can copy and paste just it, and I know it'll work just fine.

Now, if I rewrite that using your logic...

code:

var name : string procedure greeting    put "Hello " + name end greeting

Now, when I look at this procedure, what type is "name"? I ask because that could make '"Hello " + name' break. I could just look at the external variable declaration to find out... but what if it's gotten seperated from the procedure and is mixed in with hundreds of lines of code?

Now, there's also the issue of calling it. Your way I have to write out two separate lines.

code:

name := "Bob" greeting

My way:

code:

greeting ("Bob")

Mine is more flexible and easier to understand. Someone reading the first example has no idea that changing "name" changes the effect "greeting" has.

[basketball4ever]

yes i know how to do the passing procedure paramter pass thingy x_X.

But for many instances,to save lines and all... y not just use global variables. ???

[md]

Token wrote:

well considering that you usually use a procedure to execute a large group of code just put in the beginning of the procedure x:= 0 for example

code:

var y, add, c : int procedure background     y := 0     add := 0     c := 0     loop         for i : 1 .. maxx - 50             c := c + 1             drawfillbox (i + add, y, i + add + 50, y + 50, red + c)             add := add + 50             delay (50)         end for     end background     background

so now each time you run background it resets color and add

so what would happen if your procedure called another procedure that also used y? it would reset y, and the first procedure would be fubar'd.

Unless a variable is too large to pass as a parameter it should ALWAYS be local to a procedure. This is esptially important with loop counters.

wtd wrote:

...

code:

name := "Bob" greeting

My way:

code:

greeting ("Bob")

Mine is more flexible and easier to understand. Someone reading the first example has no idea that changing "name" changes the effect "greeting" has.

wtd's way is not only the better way it is also the proper way. If you want to continue programming you will eventually need to learn how to do things in such a way that other people can read and understand your code.

basketball4ever wrote:

yes i know how to do the passing procedure paramter pass thingy x_X.

But for many instances,to save lines and all... y not just use global variables. ???

It's better to write good code, then to to save a few lines by needlessly complicating your code.

[Viper]

you could use an if statement (couldent he? ) something like
if num=777 then
num:=0
end if