# include "iostream"

class water
{
public:
    void getcd (double a);
    void sexcd (double a);
    void sexdcd (double a);
    void putcd ();
    void putcc ();
    water (double c, double m, double a, double x, double l);
private:
    double cd, mj, ax;
    double xq, lq;
};
void water::getcd (double a)
{
    cd = a;
    sexcd (cd);
    sexdcd (cd);
}

void water::sexcd (double a)
{
    xq = ((a + 6) * 3.141592654) * 35;
}

void water::sexdcd (double a)
{
    lq = ((3.141592654 * (((a+6)/2)*((a+6)/2))) - (3.141592654 * ((a/2) * (a/2)))) * 20;
}


void water::putcc ()
{
    std::cout <<" 线钱 = "<< xq <<"/n";
}

void water::putcd ()
{
    std::cout <<" 路钱 = "<< lq <<"/n";
}

water::water(double c, double m, double a, double x, double l)
{
    cd = c;
    mj = m;
    ax = a;
    xq = x;
    lq = l;
}

int main (void)
{
    double k;
    water one (0,0,0,0,0);
    std::cin >> k;
    one.getcd (k);
    one.putcc ();
    one.putcd ();
    std::cin >> k;
    return 0;
}

没有注释 大楷意思就是 游泳池。。 大圆套小圆 小圆自己输入。求 价钱的。。。 就怪我懒吧