注意double型的输出格式与求圆柱体的面积

注意double型的输出格式是%lf不是1f

#include<stdio.h>
#include<math.h>
int main(){
	double r,h,s1,s2,s;
	const double pi=4*atan(1.0);
	//printf("%3f\n",pi);
	scanf("%lf%lf",&r, &h);
	
	s1=pi*r*r;
	s2=2*pi*r*h;
	s=2.0*s1+s2;
	printf("Area=%.31f\n",s);
	return 0;
}