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C++基础(六)栈、堆、new关键字、delete关键字
阅读量:265 次
发布时间:2019-03-01

本文共 1027 字,大约阅读时间需要 3 分钟。

首先更新一点关于常量变量的存储位置

全局区:          全局变量             函数体之外的变量

                         静态变量             static修饰的变量

                         字符串常量         “godv”

                         const修饰的全局变量          (全局常量)


局部变量的声明周期在栈中   不允许返回栈中的地址

#include 
using namespace std;int* run() { int a = 100; return &a;}int main() { int * p = run(); cout << *p << endl; //编译器保留了一次 cout << *p << endl; //本次出问题 system("pause"); return 0;}

利用new关键字在堆中开辟空间

#include 
using namespace std;int* run() { int a = 100; int* a1 = new int(100); return a1;}int main() { int * p = run(); cout << *p << endl; cout << *p << endl; cout << *p << endl; cout << *p << endl; system("pause"); return 0;}

new关键字的用法以及delete的用法

#include 
using namespace std;int* run() { int a = 100; int* a1 = new int(100); return a1;}int* run2(){ int* p = new int[10]; return p;}int main() { int * p = run(); cout << *p << endl; delete p; //delete 关键字后面跟指针 //cout << *p << endl;//报错已经释放 int* p2 = run2(); for (int i = 0; i < 10; i++) { p2[i] = 100 + i; } for (int i = 0; i < 10; i++) { cout << p2[i] << endl; } delete[] p2; //数组需要使用 delete[] 释放 system("pause"); return 0;}

 

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