Naming VARIABLES?

FxMazter · 2003-08-15T23:51:18

Hi, I''ve been wondering about a thing for some while... In PHP you can name a variable by content of another variable: variable test = "variable1"; variable *test = 22; result: variable1 = 22; Now that is not the syntax... but i know u can do it something like that. So how would I name a variable by the content of a string with c++? Could you guys tell me what topics to look for?

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Started by FxMazter August 15, 2003 03:31 PM

15 comments, last by FxMazter 20 years, 8 months ago

Tiffany Smith

224

August 15, 2003 04:23 PM

quote:Original post by FxMazter
Well... I have looked into the PHP syntax and it is like this:

$variable = "Billy"
$$variable = 21

Result of printing $Billy:
21

Now the reason behind this is nothing special... but just out of curiosity.

Thank you for the posts anyway

Well i have no idea about PHP and i have absolutley no idea why there would ever be reason to assign a variable to a string, what youre suggesting is very unstable in C++, but you could use atoi() to cast the string to an int, or itoa() to do it the other way around.

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[edited by - Tiffany Smith on August 15, 2003 5:25:15 PM]

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capn_midnight

1,708

August 15, 2003 04:42 PM

will atoi() work on strings of letters? I always thought that it was only used for strings that represented numerical IP addresses.

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twix

637

August 15, 2003 04:54 PM

quote:Original post by Tiffany Smith
Well i have no idea about PHP and i have absolutley no idea why there would ever be reason to assign a variable to a string, what youre suggesting is very unstable in C++, but you could use atoi() to cast the string to an int, or itoa() to do it the other way around.

You don't understand what he's talking about. What the OP wants is absolutely impossible in C++. There's no way to do that (besides simulating "variables" with a table/dictionary/what have you).

Just because it's impossible in C++ doesn't mean that it can't be useful, though.

[edited by - twix on August 15, 2003 6:01:23 PM]

Greatwolf

125

August 15, 2003 04:56 PM

What you''re asking seems awfully like something that pointers/references would be able to do. So I''m thinking along the same lines as Jason suggested over here:

quote:Original post by Jason2Jason
What that does look like though is pointer syntax. Your doing something that looks like this:

int variable1;int* test = &varible1*test = 22;

the result of variable1 would be 22 using the * operator. Read in to pointers if your not too sure of what I just wrote. Sorry if you already know about them

-J

So why doesn''t it answer your question?

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twix

637

August 15, 2003 05:07 PM

quote:Original post by Greatwolf
So why doesn't it answer your question?

An analogous feature in Lisp is the function intern, which converts a string to a usable symbol (variable name). Maybe this will be a bit more illuminating than PHP, maybe not.

>> (setf name "VARIABLE")"VARIABLE">> (set (intern name) 123)123>> name"VARIABLE">> VARIABLE123

See what that does? It's not like pointers or references.

...

Of course, in Lisp this "feature" is intensely pointless.

[edited by - twix on August 15, 2003 7:06:59 PM]

Tiffany Smith

224

August 15, 2003 05:08 PM

quote:Original post by twix
You don''t understand what he''s talking about.

Seemingly so.

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Strewth

146

August 15, 2003 11:51 PM

Sounds like mappings to me. See the STL container "map".
The variable name becomes the key to the map, the value of the variable is the result of querying the key.

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