C语言题目设圆的半径为2.5，编程该圆的周长和面积。

#include 

main() {
	double PI = 3.14;
	float c, r = 2.5;
	c = 2 * PI * r;
	printf("圆的周长为%fn", c);
}

#include 

main() {
	double PI = 3.14;
	float s, r = 2.5;
	s = PI * r * r;
	printf("圆的面积为%f", s);
}

#include 

main() {
	double PI = 3.14;
	float c,s, r = 2.5;
	c = 2 * PI * r;
	printf("圆的周长为%fn", c);
	s = PI * r * r;
	printf("圆的面积为%f", s);
}