qq_34107003的博客

代码：#include <iostream>using namespace std;enum fruit { apple, oringe, banana, watermelonl} myfruit;int main(){ myfruit = banana; switch (myfruit) { case apple: cout << "apple is here.\n"; break; case banana: cout <<

1. virtual functionbase class(virtual ), derived class(override)2. virtual destructor3. pure virtual functionit is Claimed in base class without implementation, and enforce the subclass (derived class) to implement

一、预备知识—程序的内存分配一个由C/C++编译的程序占用的内存分为以下几个部分1、栈区（stack）— 由编译器自动分配释放 ，存放函数的参数值，局部变量的值等。其操作方式类似于数据结构中的栈。2、堆区（heap） — 一般由程序员分配释放， 若程序员不释放，程序结束时可能由OS回收 。注意它与数据结构中的堆是两回事，分配方式倒是类似于链表，呵呵。3、全局区（.........

Refer to new memory reserved during program executionRefer and share large data structures without making a copy of the structuresTo specify relationship among data-linked lists, trees, graphs...