circle

#include <stdio.h>
#define pi 3.14

int main(void)
{
	int r;
	printf("r: ");
	scanf("%d", &r);
	
	double circle;
	circle = r * r * pi;
	
	printf("------------------------\n");
	printf("Circle Area: %.2f\n", circle);
	
	return 0;
}

 

<compile 결과>