#include <stdio.h>
int main(void)
{
printf("Hello world!\n");
return 0;
}

can you eplain me all...please

vhen running your file it happens nothing
an@jan-desktop:~$ gcc rep.c
jan@jan-desktop:~$ gcc rep.c
jan@jan-desktop:~$ gcc rep.c
jan@jan-desktop:~$

gcc only compiles your program into an executable file, it does not run your program. The default name of your program is a.out because you did not tell gcc what to name it. So to run your program, try this:

jan@jan-desktop:~$ ./a.out <Enter key>
bash: syntax error near unexpected token `newline'

Use ls command to search the directory and see if it contains a file called a.out. If not, then gcc probably did not compile it. If it didn't then compare your program with what ~S.O.S.~ posted and make sure it is identical. And from here I think you need to start reading some of the links that were posted in the sticky at the top of this board. I know its a lot of reading, but if you want to learn how to program you must also be willing to do a lot of reading and studying.

yes file is there but i cant open it....im gonna buy this book anyway
http://www.amazon.com/Absolute-Begin...e=UTF8&s=books

Its good that you are going to buy a book, that's the best way to learn. But that book won't teach you a thing about gcc compiler or how to use linux. you need to learn how to compile and execute a program before that book (or most any other book for that matter) will be much help to you.

oh actualy i have another book with chapter programming tools which is including all that .....

so what with that file...im not able to open it

I did not mean for you to type "<Enter key>" on the command line -- that only meant that you should have hit the Enter key on the keyboard. If you actually typed that text, then try it again without that part. just

thanks but i discovered that by myself....