#include <stdio.h>
#include <math.h>
int main()
{
float pi=3.14159;
float r,h,s,area,v;
printf("input cylinder radius 2:");
scanf("%f",&r);
printf("input cylinder height 3:");
scanf("%f",&h);
s=pi * 2.0 * r;
area=pi*r*r;
v=area*h;
printf("circumference=%.2f\n",s);
printf("bottom area=%.2f\n",area);
printf("cylinder volume=%.2f\n",v);
return 0;
}