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Một ví dụ về Đa hình Thu Aug 18, 2011 9:11 pm
El Kun
Super Moderator
Một ví dụ về Đa hình
- Code:
#include <iostream.h>
#include <conio.h>
#include <math.h>
class hinhve
{
public:
virtual float dientich() = 0;
virtual char *ten() = 0;
virtual void in()=0;
};
class haichieu : public hinhve
{
public:
virtual float chuvi() = 0;
void in()
{
cout<<"ten cua hinh: "<<ten()
<<" ,dien tich la: "<<dientich()
<<" ,chu vi la: "<<chuvi()<<endl;
}
};
class bachieu : public hinhve
{
public:
virtual float thetich() = 0;
void in()
{
cout<<"ten cua hinh: "<<ten()
<<" ,dien tich la: "<<dientich()
<<" ,the tich la: "<<thetich()<<endl;
}
};
class hinhtron : public haichieu
{
private:
float r;
public:
hinhtron() { r = 0;}
hinhtron(float bk) {r = bk;}
float chuvi()
{
return 2*3.14*r;
}
float dientich()
{
return 3.14*r*r;
}
char *ten()
{
return "Hinh Tron";
}
};
class hinhvuong : public haichieu
{
private:
float a;
public:
hinhvuong(float x)
{
a = x;
}
float chuvi()
{
return a*4;
}
float dientich()
{
return a*a;
}
char *ten()
{
return "Hinh Vuong";
}
};
class tgdeu : public haichieu
{
private:
float a;
public:
tgdeu(float x) : a(x){}
float chuvi()
{
return 3*a;
}
float dientich()
{
return a*a*sqrt(3)/2;
}
char *ten()
{
return "Hinh tam giac deu";
}
};
class cau: public bachieu
{
private:
float r;
public:
cau(float bk): r(bk){}
float thetich() { return r*r*r*3.14;}
float dientich() { return 4*3.14*r*r; }
char *ten()
{
return "Hinh Cau";
}
};
class lapphuong : public bachieu
{
private:
float a;
public:
lapphuong(float x) : a(x) {}
float thetich() { return a*a*a; }
float dientich() { return 6*a*a; }
char * ten() { return "Hinh Lap Phuong"; }
};
void main()
{
hinhve *p;
p = new hinhtron(3);
p->in();
delete p;
p = new lapphuong(3);
p -> in();
delete p;
p = new cau(3);
p -> in();
delete p;
p = new tgdeu(5);
p -> in();
delete p;
p = new hinhvuong(6);
p -> in();
getch();
}
