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If you don't define a function's contents with { } right then and there, it'll be assumed to be extern. This is very unlike variables, which never assume they're external unless you say so.
...

Here is how extern works.

You have three C files. File1 declares the variable foo (we are just doing variables, functions work the same).

int foo;

File2 and File3 both use the variable. ...

You got it exactly backwards.

You should put this in the header file:

extern const char ack_msg[];


...and this in one and only one C file, call it "data.c" perhaps:

#include "data.h"
...

The size of a pointer to a character is a constant in any particular program; whether that pointer points to a single character or to a nul-byte terminated string of 100 characters does not affect...

Here is a modified version of your code with a few changes and lots of comments added. Please read through the code, examine the output, and let me know if something is still confusing:
#include...

numlist holds two and only two things:
1) A pointer to memory
2) An integer

Does a pointer get bigger or smaller? No... A pointer is just a number, always the same size.

Yes, you have to keep a variable wich keeps number of elements in your array.

In many situations I find it convenient to hold ptr to array and counter together in one simple structure. If element...

linelist[index] = line;


line here is a pointer to something returned earlier. so you've set each element to point to the same place. you malloc enough for the string. you'd want to copy it...

Hi friend,

The code is not only for n=0, its in a for loop. Let me explain with an example.

If s contain a string "5270", then the loop continue for 4 times:

1st : 10*0 + 5 = 5
2nd :...

Simplifies the code. If not done this way, you would have to have extra code to handle the n = 0 case.