Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in C (judge verdict: Time Limit Exceeded)

#include <stdio.h>
#include <math.h>
 
int main(void){
	double r, s, c;

	for(r = 1; r > 0;){
		scanf("%lf", &r);
		s = r * r * M_PI;
		c = r * 2 * M_PI;
		printf("%.6lf %.6lf\n", s, c);
	}

	return 0;
}