[Mingw-users] [mingw - C/C++] RE: Gcc Includes Files error

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By: chicares

>    char *pointer;    
>    pointer = new char [3];

Because you're using C++, you ought to use the
standard string class.

> what i wanted to know is simply how to create a
> strlen() function. i wanted to know how does the
> function determinates the length of the char vector.

If you're dealing with null-terminated arrays of char,
then just use the standard strlen() function. It counts
the number of characters that precede the first null.

When you allocate memory yourself with new and
delete, the language doesn't give you any way to
ask later how much you allocated.

It is usually a design error to write new and delete
yourself. The standard string class manages memory
for you. It provides functions that report its usage of
memory.

> waht i meant to say is, if i reserv a 10 bytes vector,
> and i only fill 5 bytes and the 6th is '\0' how can i
> know that the pointer has 10 bytes reserved to him ?

You cannot. You should not wish to. If you feel that
you need to, then your design is wrong.

> the only knowledge i have i learned from my C++
> teacher, and he was a preatty bad teacher.

Correct.

I know only one good C++ textbook for beginners:
  http://www.acceleratedcpp.com/

In addition to this forum, here's a newsgroup that
would be helpful too:
  news://alt.comp.lang.learn.c-c++/
Here is its faq:
  http://www.comeaucomputing.com/learn/faq/


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