Lets Program

Let's Discuss a Simple program in C that display "a welcome message".

/*C program to display a welcome message*/

#include<stdio.h>

main()
        {

         printf("Hello sir! welcome to the programming world \n");

         exit(0);
        }
The output of the above program will be:  Hello sir! welcome to the programming world
How to compile and execute the program?

• First of all you need a C compiler to compile the above bunch of codes.  There's a huge number of free c compilers for windows OS available on net e.g Turbo C/C++ , Dev C++ , Eclips etc. Google any of it and install on your system. I recommend Dev c++ IDE for beginners. In Linux, terminal is enough to start with.
• Compile the code above with any of the standard compiler and run. Voila you must get the same output as stated above.
  

Let's discuss the components of the above program

• main() is a special function in C, which must exist in a C program as the execution of the program from this point.
• printf is a standard C function called from main, used for displaying ouput.
• "\n" indicates that the output will be displayed in a newline.
• 'stdio.h' is a header file responsible for input-output function.
• exit() is also a standard function that terminates the program after execution. It takes a value as parameter. In the program above it takes 0 as parameter. But it is actually not needed here as it has been used after the last line. Hence without using this function, the program will terminate automatically after displaying the output.