why we put #include in C?

why we put #include in C | # Include stands for | include working | Include in C

If a line starts with a hash, denoted by #, kit tells the compiler that a command should be sent to the C PREPROCESSOR. The C preprocessor is a program that is run before compilation takes place ( hence the name).

Basically, when the preprocessor finds #include it looks for the file specified and replaces #include with the contents of that file. This makes the code more readable and easier to maintain if you needed to use common library functions.

Header files have the extension .h and the full filename follows from the #include directive . They contain functions that you may or may not have used in your program.

for e.g, the stdio.h file is required if you have used functions like printf() and scanf() in your program.

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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

My 1st Program...

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...


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 ();