naming variables by parameter

[flinks]

Hi all,
I'm starting in C and having problem with naming variables. I have this function:

void new (int a)
{
int new_"$a";
.
.
.
}

I'd like to replace "$a" with the content of variable a. It's possible to be done in C?

Thank you for any help.

[Banfa]

Hi all,
I'm starting in C and having problem with naming variables. I have this function:

void new (int a)
{
int new_"$a";
.
.
.
}

I'd like to replace "$a" with the content of variable a. It's possible to be done in C?

Thank you for any help.

No it's not possible and anyway it would be pointless. You have declared new_??? as a stack variable so it only exists for the lifetime of the function call.

Anyway neither C nore C++ support this sort of variable variables names (as would be available in some scripting languages (PHP springs to mind)).

I think you might do better if you describe what you are trying to achieve then may be we could suggest a way to do it.

[weaknessforcats]

Since this is C and not C++, you couild check out the preprocessor token pasting operator ## and write a macro for this.

Just don't do this in C++ as there are alternate ways to do this.

[flinks]

No it's not possible and anyway it would be pointless. You have declared new_??? as a stack variable so it only exists for the lifetime of the function call.

Anyway neither C nore C++ support this sort of variable variables names (as would be available in some scripting languages (PHP springs to mind)).

I think you might do better if you describe what you are trying to achieve then may be we could suggest a way to do it.

Thank you for reply.
I thought in this because I write in bash, and it's is possible there.
my problem is the follow:

My program will receive a list of n number, depending on some tests it must be added to an existent linked list or then the program must create a new one to add then. I can do it of any way, but there is some considerations:
I don't know how many numbers will enter;
I don't know how many lists will be needed;
I must use linked lists in the solution;

I'll be very grateful if someone help me or indicate some material to I study.

[Banfa]

OK so you need a variable number of lists containing a variable number of numbers.

It isn't nice which I would use a 2 layer linked list.

That is I would have a linked list of structures that contained the criteria and the head pointer to the sublists of numbers.

Of course if you where using C++ then I would suggest using the STL map and list classes.

Do you know how to construct a basic linked list?

[Banfa]

Since this is C and not C++, you couild check out the preprocessor token pasting operator ## and write a macro for this.

Not at runtime, the preprocessor runs as part of the compiler.

[flinks]

OK so you need a variable number of lists containing a variable number of numbers.

It isn't nice which I would use a 2 layer linked list.

That is I would have a linked list of structures that contained the criteria and the head pointer to the sublists of numbers.

Of course if you where using C++ then I would suggest using the STL map and list classes.

Do you know how to construct a basic linked list?

I'm starting in linked lists today, but already can do the basic operations. I'll try to do the "nested" linked list, it seems possible. Thank you for the help.