求圆，球，圆柱等的周长面积体积2020.11.16

//求圆，球，圆柱等的周长面积体积
#include<stdio.h>
int main( ){
double a,h,r,c,s,S,v,n;
a=3.141593;
scanf("%lf %lf",&r,&h);
c=2ar;
s=arr;
S=4arr;
v=(4.0/3.0)arrr;
n=arrh;
printf("%.2lf %.2lf %.2lf %.2lf %.2lf\n",c,s,S,v,n);
return 0;
}