UBOUND

[bartok]

As you can see, I'm in the mood for questions.

Look at this:

Code: (Select All)

OPTION _EXPLICIT

DIM myArray%(5)

PRINT UBOUND(myArray%)

the result is "5".

Fine.

Look at this:

Code: (Select All)

OPTION _EXPLICIT

DIM myArray%

PRINT UBOUND(myArray%)

This is less "fine".
1. If OPTION_EXPLICIT is activeted, it says "myArray" is not defined.... why?
2. If OPTION_EXPLICIT is deactiveted, the result is "10"... why?

[bplus]

As you can see, I'm in the mood for questions.

Look at this:

Code: (Select All)

OPTION _EXPLICIT

DIM myArray%(5)

PRINT UBOUND(myArray%)

the result is "5".

Fine.

Look at this:

Code: (Select All)

OPTION _EXPLICIT

DIM myArray%

PRINT UBOUND(myArray%)

This is less "fine".
1. If OPTION_EXPLICIT is activeted, it says "myArray" is not defined.... why?
2. If OPTION_EXPLICIT is deactiveted, the result is "10"... why?

DIM myArray% is only a varaible NOT an array it needs the () for an array Ubound can make sense of.

[SMcNeill]

To highlight what bplus is saying:

DIM x
DIM x(5)

Of the above, which is a variable and which is an array?

That's basically what you've did in your code.

[bartok]

To highlight what bplus is saying:

DIM x
DIM x(5)

Of the above, which is a variable and which is an array?

That's basically what you've did in your code.

I thought that "x" was an array 1 x 1, as to say made by 1 variable and I thought that x(5) was an array 6 x 1, made by 6 varibles... so to:

Code: (Select All)

OPTION _EXPLICIT

OPTION BASE 1

DIM myArray%

PRINT UBOUND(myArray%)

I expected the answer "1".

So, what is the difference beetween:

DIM x%(1) and DIM x%?

(I generally use OPTION BASE 1. Without it I would expected "0" and DIM x%(1) would be DIM x%(0))

[SMcNeill]

DIM X(1) is an array with one element.
DIM X is a variable.

SUB foo(x, y() )

Now, in that SUB, what values can you pass to those parameters?
For x, you pass a single value, or a variable.
Your y(), you pass a whole array.

A variable is NOT the same as a single element array.

Variables can never be REDIMed to hold more elements.  They have no indexes.  The contain just a single value.  

Even a single-element array has an index.  X(0).  This index tells you, "THIS IS NOT A VARIABLE."  Don't fool yourself into thinking it is.

[bartok]

DIM X(1) is an array with one element.
DIM X is a variable.

SUB foo(x, y() )

Now, in that SUB, what values can you pass to those parameters?
For x, you pass a single value, or a variable.
Your y(), you pass a whole array.

A variable is NOT the same as a single element array.

Variables can never be REDIMed to hold more elements.  They have no indexes.  The contain just a single value.  

Even a single-element array has an index.  X(0).  This index tells you, "THIS IS NOT A VARIABLE."  Don't fool yourself into thinking it is.

Ok, It's clear. Thank's!