[C] Macro, Constant, Preprocessor

/*------------------------------------------------------------------------------------------

@ Pratice C laguage

Author           : SAM

Created          : 29-03-2017

Modified         : 29-03-2017

Language/ver     : C in MSVS2015

Description     : Practice

KEYWORD : Macro, Constant, Preprocessor

------------------------------------------------------------------------------------------*/

#include<stdio.h>

#define SQUARE(x) x*x

int main(void) {

int a;

float d;

printf("Input a number(int) : ");

scanf_s("%d", &a);

printf("Sqare of %d : %d\n", a, SQUARE(a));

printf("INputer a number(float) : ");

scanf_s("%f", &d);

printf("square of %f : %f \n", d, SQUARE(d));

return 0;

}

1. 자료형에 독립적이다.

2. 작은 함수는 매크로  처리하면 효율적이다. 단순 치환이므로.