//Bai31: TINH CHU VI VA DIEN TICH CAC HAM

#include<iostream>

#include<math.h>

using namespace std;

//Khai bao lop Hinh

class Hinh

{

private:

public:

virtual void nhap()=0;

virtual void hien()=0;

virtual float TinhDT()=0;

virtual float TinhCV()=0;

};

//Khai bao lop HinhCN

class HinhCN:public Hinh

{

private:

float a,b;

public:

void nhap();

void hien();

float TinhDT();

float TinhCV();

};

//Khai bao lop HinhTG

class HinhTG:public Hinh

{

private:

float a,b,c;

public:

void nhap();

void hien();

float TinhDT();

float TinhCV();

};

//Khai bao lop HinhTR

class HinhTR:public Hinh

{

private:

float r;

public:

void nhap();

void hien();

float TinhDT();

float TinhCV();

};

//==========CHUONG TRINH CHINH=======

int main()

{

Hinh *m[50];

int i,n=0;

char traloi1,traloi2,traloi3;

do

{

cout<<"CHUONG TRINH TINH ";

cout<<"

1.Nhap kich thuoc cac hinh";

cout<<"

2.Hien thi dien tich va chu cac hinh";

cout<<"

3.Ket thuc chuong trinh";

cout<<"

Nhap vao lua chon: "; cin>>traloi1;

if(traloi1=='1')

{

do

{

cout<<"

Nhap kich thuoc cho hinh nao (1-CN,2-TG,3-TR)? "; cin>>traloi2;

switch(traloi2)

{

case '1':

m[n]=new HinhCN; break;

case '2':

m[n]=new HinhTG; break;

case '3':

m[n]=new HinhTR; break;

default:

cout<<"Lua chon sai.";

break;

}

if(traloi2=='1' || traloi2=='2' || traloi2=='3') m[n++]->nhap();

cout<<"

Co nhap nua khong (c/k)? "; cin>>traloi3;

}

while(traloi3=='c' || traloi3=='C');

}

else if(traloi1=='2')

{

cout<<"Dien tich va chu vi cac hinh da nhap:

";

for(i=0;i<n;i++)

{

//if(typeid(*m[i])==typeid(HinhCN)) cout<<i+1<<".Hinh chu nhat:

";

//if(typeid(*m[i])==typeid(HinhTG)) cout<<i+1<<".Hinh tam giac:

";

//if(typeid(*m[i])==typeid(HinhTR)) cout<<i+1<<".Hinh tron:

";

m[i]->hien();

cout<<"

\tDien tich: "<<m[i]->TinhDT();

cout<<"

\tChu vi: "<<m[i]->TinhCV()<<endl;

}

}

}

while(traloi1!='3');

cout<<endl;

return 0;

}