Determining an Array's Length in Pascal

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Determining an Array's Length in Pascal

 
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Sep 29th, 2006
I am a mainly Java and VB programmer. However, I am writing a program that generates computer code in various languages. One of these is Pascal.

What I am asking is simple.

To detemine the size of an array in Java and VB I would enter:

Pascal and Delphi Syntax (Toggle Plain Text) 
  1.  anArray.length

What is the Pascal equivalent?? I have looked arround the web and found no info. Is there no such equivalent??

Thanks for your kind help

Andrew.
Last edited by Scottie_uk; Sep 29th, 2006 at 3:03 pm.
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Re: Determining an Array's Length in Pascal

 
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Sep 30th, 2006
I've not used Delphi for a while but is it something like

Pascal and Delphi Syntax (Toggle Plain Text) 
  1. Length(anArray)
Note to self... pocket cup
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Re: Determining an Array's Length in Pascal

 
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Oct 8th, 2006
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Originally Posted by Scottie_uk View Post
I am a mainly Java and VB programmer. However, I am writing a program that generates computer code in various languages. One of these is Pascal.

What I am asking is simple.

To detemine the size of an array in Java and VB I would enter:

Pascal and Delphi Syntax (Toggle Plain Text) 
  1.  anArray.length
What is the Pascal equivalent?? I have looked arround the web and found no info. Is there no such equivalent??

Thanks for your kind help

Andrew.
Use Low() and High() to find the lowest element or highest element index, respectively, of an array.

code
Last edited by codewritinfool; Oct 8th, 2006 at 2:17 pm.
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Re: Determining an Array's Length in Pascal

 
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  #4
Dec 31st, 2006
in pascal, you have to predefine all your variable types, including array lengths, so you should already know the length.
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Re: Determining an Array's Length in Pascal

 
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Dec 31st, 2006
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Originally Posted by needs_help View Post
in pascal, you have to predefine all your variable types, including array lengths, so you should already know the length.
NOT TRUE. Free Pascal permits dynamic arrays defined like this:

Type
TByteArray : Array of Byte;
Var
A : TByteArray;

SetLength(A,1000);


After a call to SetLength, valid array indexes are 0 to 999: the array index is always zero-based.

Borland Object Pascal (Delphi) permits dynamic arrays defined like this:

var
byteArray : Array of Byte;

SetLength(byteArray, 5);



code
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Re: Determining an Array's Length in Pascal

 
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Dec 31st, 2006
Ok, but in dev-pascal, you can't change the length.
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Re: Determining an Array's Length in Pascal

 
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Dec 31st, 2006
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Originally Posted by needs_help View Post
Ok, but in dev-pascal, you can't change the length.
dev-pascal is an IDE, not a compiler. It commonly uses Free Pascal or GNU Pascal.

I've already shown how to do it in Free Pascal.

In GNU Pascal, you can use Schemata:

http://www.mirrorservice.org/sites/w...schemademo.pas
code
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