qt开发环境

#include <QCoreApplication>#include <iostream>using namespace std;struct Student{    string name;    int age;};int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    int* p1 = new int;    *p1 = 666;    ++*p1;    cout << *p1 << endl;    delete p1;    p1 = NULL;    p1 = new int();//默认是0    cout << *p1 << endl;    delete p1;    p1 = NULL;    p1 = new int(666);//默认是666    cout << *p1 << endl;    delete p1;    p1 = NULL;    delete p1;//不会出错，delete会自动检查 是不是空//    *p1 = 233;    p1 = new int[4]{1,2,3,4};    cout << p1[0] << p1[1] << p1[2] << p1[3]<< endl;    delete[] p1;//    p1 = new int[0xFFFFFFFF];    try{        p1 = new int[/*0xFFFFFFFF*/3];        //成功，访问内存(可以在这里)        //delete[] p1;        //p1 = NULL;    }    catch(exception& ex){        cout << ex.what() << endl;        cout << "动态内存分配失败" << endl;        return -1;    }    //成功，访问内存（也可以在这里）    //delete[] p1;    //p1 = NULL;    int (*p2)[4] = new int[3][4];//4是内层结构    p2[0][0] = 2;    cout << p2[0][0] << endl;    delete[] p2;    int (*p3)[4][5] = new int[3][4][5];    p3[0][0][1] = 777;    cout << p3[0][0][1] << endl;    delete[] p3;    string* p4 = new string;    cout << '[' << *p4 << ']' << endl;    delete p4;    p4 = new string("ayumi hamasaki");    cout << '[' << *p4 << ']' << endl;    delete p4;    p4 = new string[3]{"I ","love ", "ayumi"};    cout << p4[0] << p4[1] << p4[2] << endl;    delete p4;    Student* p5 = new Student;    p5->name = "ayu";    p5->age = 33;    cout << p5->name << p5->age << endl;    delete p5;    return a.exec();}