#include <stdio.h> double getArea(double); double getCircum(double); double PI = 3.14; int gi; int main(void) { double r = 5.87; const double PI = 3.141592; printf("면적: %.2f\n", getArea(r)); printf("둘레1: %.2f\n", 2 * PI*r); printf("둘레2: %.2f\n", getCircum(r)); printf("PI: %f\n", PI); printf("gi: %d\n", gi); return 0; } double getArea(double r) { return r*r*PI; }