求圆的周长和面积
#include<iostream>using namespace std;
class Circle
{
private:
float r;
float f;
float l;
public:
void outf();
void outl();
};
void Circle::outf(void)
{
f=2*3.14*r;
cout<<"f is:"<<f<<endl;
}
void Circle::outl(void)
{
l=3.14*r*r;
cout<<"l is:"<<l<<endl;
}
void main()
{
double f,l,r;
Circle c;
cin>>r;
c.outf();
c.outl();
}哪里有错误啊，帮忙改下，谢谢了
