THE # DEFINE DIRECTIVE in C Language | Working of #Define
The #define directive is used to define a symbol to the preprocessor and assign it a value. The symbol is meaningful to the preprocessor only in the lines of code following the definition. For example, if the directive #define NULL 0 is included in the program, then in all lines following the definition, the symbol NULL is replaced by the symbol. If the symbol NULL is written in the program before the definition is encountered, however, it is not replaced.
The # define directive is followed by one or more spaces or tabs and the symbol to be defined. The syntax of a preprocessor symbol is the same as that for a C variable or function name. It cannot be a C keyword or a variable name used in the program; if it is so a syntax error is detected by the compiler.
Related Links :
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 ();
}
No comments:
Post a Comment