Distinguish between library functions (Pre defined) and user defined functions.

Library Function User Defined Functions
  • LF(library functions) are Predefined functions.
  • UDF(user defined functions) are the function which r created by user as per his own requirements.
  • UDF are part of the program which compile runtime
  • LF are part of header file
    (such as MATH.h) which is called runtime.
  • In UDF the name of function id decided by user
  • in LF it is given by developers.
  • in UDF name of function can be changed any time
  • LF Name of function can't be
    changed.
Example : SIN, COS, Power Example : fibo, mergeme

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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!!!