This article describes how to write, compile and execute a "Hello World" program in C on Linux (Fedora).

1. the prerequisites

• a text editor of your choice (e.g. vi)
• a C compiler (e.g. gcc)

make sure you have installed the GNU C compiler rpm:

# rpm -qa gcc
gcc-4.1.2-33

If it is not installed yet, you can install it with yum (you need to be root to do that):

# yum install gcc

2. write the code

open an empty file with a text editor (e.g. vi):

# vi helloworld.c

#include <stdio.h>

int main ()
{
    printf ("Hello World!\n");
}

explanation

#include <stdio.h>

This loads some definitions for basic I/O functions (used for the command "printf").

int main ()
{
 (...)
}

The main function ist where the execution of the program starts.

printf ("Hello World!\n");

This prints out the string "Hello World!" and a "line break" (\n).

3. compile the code

# gcc helloworld.c -o helloworld

4. run the program

# ./helloworld
Hello World!

• Add New
• Search

Comments (0)

Write comment

Your Contact Details:

Name:

Email: do not notifynotify

Website:

Comment:

Title:

UBBCode:         -color-aquablackbluefuchsiagraygreenlimemaroonnavyolivepurpleredsilvertealwhiteyellow -size-tinysmallmediumlargehuge

Message:

Security

Please input the anti-spam code that you can read in the image.

Powered by !JoomlaComment 4.0 beta1

!joomlacomment 4.0 Copyright (C) 2009 Compojoom.com . All rights reserved."