#include <stdio.h>
 
#define PI 3.14159265

double alanHesap(double yaricap);
double cevreHesap(double yaricap);
	
int main()
{
	double yaricap;
	double cevre;
	double alan;
	
	printf("Dairenin yaricapini giriniz...\n");
	scanf("%lf", &yaricap);
	
	alan = alanHesap(yaricap);
	cevre = cevreHesap(yaricap);
	
	printf("Alan : %lf \nCevre : %lf\n", alan, cevre);
	
	system("pause");


	return 0;
}

double alanHesap(double yaricap)
{
	return PI * yaricap * yaricap;
}

double cevreHesap(double yaricap)
{
	return PI * 2 * yaricap;
}