How to create your first 'C' program
YOUR FIRST 'C' PROGRAM
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How to create your first 'C' program |
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");
}
Output :
Hello world
C program
EXPLANATION :- After printing Hello world on the first line, line is changed by the inclusion of new line character \n. It can also placed in the beginning of second printf statement as printf ("\n Sencond Program") . Note the "\" is known as backlash and "/" known as forward slash. The usual mistake committed by beginners is to write "/" instated of "\"
CLICK NOW FOR MORE READ ....
MACHINE LANGUAGE
C- Programming
What is a computer Virus ?
Hello world
C program
EXPLANATION :- After printing Hello world on the first line, line is changed by the inclusion of new line character \n. It can also placed in the beginning of second printf statement as printf ("\n Sencond Program") . Note the "\" is known as backlash and "/" known as forward slash. The usual mistake committed by beginners is to write "/" instated of "\"
CLICK NOW FOR MORE READ ....
MACHINE LANGUAGE
C- Programming
What is a computer Virus ?