How to create your first 'C' program

                      YOUR FIRST 'C' PROGRAM 

How to create your first 'C' program

Lot's of theory! Now let's put all the theory into action by writing few programs which will clarify your concepts studied so far.
    So let gets on with our first program which simply prints Hello world on to the screen

/* Program 1.0 printing Hello world on the screen */
#include <stdio.h>
main( )
{
printf ("Hello world");

}

Output :
Hello world

EXPLANATION :- Whatever written inside /*and*/ is treated as comment, and is  ignored by the C compiler. You may also comment multiple lines as we will see in the coming programs. We use comments to write which program we are going to make or to write some remarks about instruction for better understanding.
 #include is the processor directive. stdio.h is the standard input output header file (due to .h extension ) which is to be  included in every C program. There may be space between #include and <stdio.h> . Next line is the function main ( ) due  to symbol ( ) which is known as function symbol.
This function must be present in every C file you make because execution of your  C program starts from this main ( ). { is the opening brace for main function and } is the closing brace. All statements, instructions are written inside the main function. Printf () is the inbuilt function (pre built in C compiler ) which parts whatever written inside " " on to the screen , so the output. C is case-sensitive programming language , so what ever you use that is in-built C has to be in lower case.
     The declaration of printf function is given in the header file stdio.h Every statement in C program has to ind with ; (semicolon).

PROGRAMMING EXAMPLE PART-2

/* Program 1.1 A C PROGRAM WITH TWO PRINTF */
#include <stdio.h>
main( )
{
printf ("Hello world");
printf ("C program");

}

Output :
Hello world C program

EXPLANATION :- We have used two printf statements in the program. By default the output is produced on the same line. If we want output to be placed on the next line we can do so as this done in the next program.

/* Program 1.1 A C PROGRAM WITH TWO PRINTF */
#include <stdio.h>
main( )
{
printf ("Hello world \n");
printf ("C program");

}