mainprogram.cpp

C++编成数据结构与程序设计方法 D.S.Malk编著

//Chapter 13: Virtual Functions

#include <iostream>

#include "derivedClass.h"

using namespace std;

void callPrint(baseClass *p);

int main()
{
    baseClass *q;                           //Line 1
    derivedClass *r;                        //Line 2

    q = new baseClass(5);                   //Line 3
    r = new derivedClass(3, 15);            //Line 4

    q->print();                             //Line 5
    r->print();                             //Line 6

    cout << "*** Calling the function "
         << "callPrint  ***" << endl;       //Line 7

    callPrint(q);                           //Line 8
    callPrint(r);                           //Line 9

    return 0;
}

void callPrint(baseClass *p)
{
    p->print();
}