[C] #define 매크로를 활용한 사칙연산 계산기

#include <stdio.h>
#pragma warning(disable:4996)
#define ADD(x,cal,y) printf("%d %c %d = %d\n",(x),(cal),(y) ,(x+y))
#define MUL(x,y) ((x)*(y))
#define SUB(x,y) ((x)-(y))
#define DIV(x,y) ((x)/(y))

#define input_expression(x,cal,y) scanf("%d %c %d",&(x),&(cal),&(y))


int main(void)
{
	int sel = 0;
	int num1, num2;
	char cal;
	
	while(1)
	{
		printf("수식입력(종료:ctrl+z): ");
		

		if (input_expression(num1, cal, num2) < 0) { break; }
		switch (cal)
		{
		case '+': ADD(num1, cal, num2); break;
		case '-': printf("%d %c %d %d\n", num1, cal, num2, SUB(num1, num2)); break;
		case '*': printf("%d %c %d %d\n", num1, cal, num2, MUL(num1, num2)); break;
		case '/': printf("%d %c %d %d\n", num1, cal, num2, DIV(num1, num2)); break;
		}
	}
	return 0;
}