LEARN MORE ABOUT # define AND # include

LEARN MORE ABOUT # define AND # include

Although you have been using #define and # include for some time .both have more features than you’ve read about so far .Each is examined here in detail.

In addition to using #define to define a macro name that will be substituted by the character sequence associated with that macro, you can use #define to create function-like macros. In a function-like macro, arguments can be passed to macro when it is expanded by the preprocessor. For example, consider this program.

#include<stdio.h>

#define SUM(i , j) i*j

int main(void){

int sum;

sum = SUM(10, 20);

printf("%d", sum);

return 0;

}

By the preprocessor.  As you can see, the values 10 and 20 are automatically substituted for the parameters I and j.