#define PI 3.14
#include<iostream.h>
#include<iomanip.h>
 void main()
{ float r,h,zc,mj,bmj,tj;
 cin>>r>>h;
 zc=2*r*PI;
 mj=r*r*PI;
 bmj=4*PI*r*r*r;
 tj=PI*r*r*r*h;
 cout<<setiosflags(ios::fixed)<<setprecision(2);
 cout<<圆周长<<zc<<endl;
 cout<<圆面积<<mj<<endl;
 cout<<圆球表面积<<bmj<<endl;
 cout<<圆柱体积<<tj<<endl;                 这一行显示有错误 C:\Users\DELL\Desktop\作业1.cpp(15) : error C2059: syntax error : '<<'
}