#include <iostream>
using namespace std;
class shape
{
public:
virtual void show() = 0;
virtual double peri() = 0;
};
class circle :public shape
{
public:
{
const double PI 3.14;
int r;
double peri(int z)
{
int z = 2 * PI * r;
peri=z;
return 2 * PI * r;
}
void show()
{
cout << "圆的半径=" << r << endl;
cout << "圆的周长=" << peri << endl;
}
};
int main()
{
circle a1 (2);
shape* pS;
p = &a1;
p->show()
}
#include <iostream>
using namespace std;
class shape
{
public:
virtual void show() = 0;
virtual double peri(int z) = 0;
};
class circle :public shape
{
public:
const double PI=3.14;
int r;
double c;
circle(int z){
c = peri(z);
}
double peri(int z){
r = z;
return 2 * PI * r;
}
void show(){
cout << "圆的半径=" << r << endl;
cout << "圆的周长=" << c << endl;
}
};
int main()
{
circle a1(2);
shape* p;
p = &a1;
p->show();
}