C++中的new——delete

//對于動态申請
           

</pre><pre code_snippet_id="1969098" snippet_file_name="blog_20161106_3_5056730" name="code" class="cpp">#include <iostream>
#include <string.h>
#include <stdlib.h>

using namespace std;
           

<pre name="code" class="cpp"><pre name="code" class="cpp">int main()
{
    int *p=new int(200);//初始化
    cout<<*p<<endl;
    delete p;

    string *ps=new string("Tianan Square");//初始化
//    string *ps=new string;
//    *ps="tianan square";//初始化
    cout<<*ps<<endl;
    delete ps;

    struct Stu
    {
        int age;
        string name;
    };

    Stu *pStu=new Stu {10,"xiaoming"};//初始化
    cout<<pStu->age<<endl;
    cout<<pStu->name<<endl;
    delete pStu;
}
           

int main1(){ char *p=new char[40];//開辟一個數組 strcpy(p,"china"); cout<<p<<endl; int *pi=new int[5];

//int *pi=new int[5]{0}; //也是可以對其初始化的
    memset(pi,0,sizeof(int[5]));
    for(int i=0;i<5;i++)
    {
        cout<<pi[i]<<endl;
    }


    //開辟指針數組
    char **ppc=new char*[5]{NULL};//初始化為空

    ppc[0]="new day";
    ppc[1]="batman";
    ppc[2]="water";

    while(*ppc){
        cout<<*ppc++<<endl;
    }

    int(*par)[4]=new int[3][4]{{0}};//初始化開辟一個二維數組，注意這裡是{{}}；
    for(int i=0;i<sizeof(int[3][4])/sizeof(int[4]);i++)
    {
        for(int j=0;j<4;j++)
        {
            cout<<par[i][j]<<" ";
        }
        cout<<endl;
    }
    
    return 0;
}
           

釋放

int main2()
{
    int *p=new int;
    delete p;//釋放
    
    int *q=new int[1000];
    delete []q;//對于數組的釋放必須是[]q;
}