#define preprocessor

The #define preprocessor allows us to define symbolic names and constants. A quick example

	#define PI 3.14159

This statement will translate every occurance of PI in the program to 3.14159. Here is a more complete example:


	#define PI 3.14159
	main()
	{
   	   int r=10;
	   float cir;
	   cir = PI * (r*r);
	}

This feature is partically usefull for defining 'magic' numbers.

Examples:

example program.

Conflict between enum and #define.