Whats is Defination of function.

A function is a subroutine that may include one or more statements to perform a specific task.

To write a 'C' program, we first create functions and then put them together.

'C' function can be classified into two categories namely library functions and user defined functions main() is an example of user defined functions and scanf() and printf() belongs to category of library functions. Same other examples of library functions are sqrt(), cos(), strcpy(), strcmp() etc. The main difference between library functions and user defined functions is that library functions are not required to be written by user whereas a user defined function has to be developed by the user at the time of writing a program.

Library functions are available to all users but user defined function must be defined and used in only a particular program and it is not accessible by all. Library functions are available in compiled object code form and cannot be viewed by user.

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More Useful Topics...

 

History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
language.

My 1st Program...


#include
#include
void main ()
{
clrscr ();
printf ("\n\n\n\n");
printf ("\t\t\t*******Pankaj *******\n");
printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();
}

Next Step...


#include
#include

void main ()
{
clrscr ();
printf ("\n\n\n\n\n\n\n\n");
printf ("\t\t\t --------------------------- \n\n");

printf ("\t\t\t | IGCT, Info Computers, INDIA | \n\n");
printf ("\t\t\t --------------------------- ");

getch ();

}

Hits!!!