关于#c++#的问题，请各位专家解答！

#include
using namespace std;
int main()
{
double C,S,g;
const double g=3.1415926;
cout<<"请输入半径"<<end1;
cin>>r
S=grr;
C=2gr;
cout<<"圆的周长"<<C<<end1;
cout<<"圆的面积"<<S<<end1;
}

endl不是end1,末尾是小写的L