C programming language simple help ?

[danilo84]

I want to ask anybody who knows to answer me:
How can i make and register C library files.. Those are files which has extension .h like stdio.h, which is standard library

I want to create (for example) sum.h
which will have some functions in it

I am not programmer beginner i know programming in BASIC, VB6,0 and PASCAL. I learned them now i am learning C so could you please help me to do this

PS : I have Xubuntu (UNIX OS) !

[x-seb-x]

Hello,

so I suggest you to find a tutorial to learn this language. I suggest you to "Teach Yourself C in 21 Days" which is quite complete as a pdf.

About your question, an example should be:

as a header:

#include<stdio.h>

int add(int a,int b);


.cpp:

#include "sum.h"

int add(int a, int b)
{
int sum = 0;
return (sum = a +b)
}

int main(void)
{
int a,b = 3;
int s = 0;

s = sum(a;b);
printf( "sum : %d",&s);

return 0;
}

[danilo84]

Can you please explain that little a bit more.

Is this part of the code in .c file which is going to be compiled

#include <stdio.h>
int add(int a, int b)

and .cpp is library file ?

[x-seb-x]

Oh sorry,

well, the header contains the function' declaration. You must include it when you want to use this functions.

After, the .c (sorry, the .cpp is for C++), is the file which will be compiled.

But I really suggest you to read a tutorial about C language. It could be quite complicated sometimes..

Good luck,
Seb

[danilo84]

Thank you very much, the book is great. That will do the job

[ramin.honary]

I want to ask anybody who knows to answer me:
How can i make and register C library files.. Those are files which has extension .h like stdio.h, which is standard library

When you install the C compiler, it will automatically install the C standard library and the necessary static and dynamic linking libraries which your program must use. The command to install it in Xubuntu is:

apt-get install gcc

Then, to compile your C program, you would execute this command:

gcc sum.c -o sum

This simple command will automatically link the correct library files, it will automatically include the <stdio.h> and other standard library files from the default location, and will output a binary executable program called "sum".

When you use the apt-get install gcc command, it will install the C standard library headers in "/usr/include" directory, which is the default location. Running the "gcc" command, it will check automatically in this directory for include files listed in angle brackets like <stdio.h>, and if you include files with quotation marks, like "sum.h", it will search in the current directory for these ".h" files. If your program is spread across multiple ".c" files (for example, if you have a "sum.c" and a "sum-parser.c") then you need to specify all of the ".c" files on the command line. For example:

gcc sum.c sum-parser.c -o sum