c++类实例化的两种方式

从堆中实例化
从栈中实例化

1 //类中有构造函数的情况下

class temp{public:    //构造函数    temp(int Num, string abc)    {        theNum = Num;        theabc = abc;    }    void printf()    {        cout << theNum << theabc << endl;    }private:    int theNum;    string theabc;};int main(){    //从栈中实例化    temp ywb(10,"yangwenbin");    ywb.printf();    system("pause");}int main(){    //从堆中实例化    temp *p = new temp(10,"yangwenbin");    p->printf();    getchar();}

类中无自定义的构造函数时，编译器会自动生成

class temp{public:    int theNum;    string theabc;    char name[10];};int main(){    //从堆中实例化    temp *p = new temp[10];    temp *q = new temp();    q->theNum = 10;    q->theabc = "ywb";    delete []p;    delete q;    return 0;}int main(){    //从栈中实例化    temp ywb;    temp ywb1[10];    ywb.theabc = "yangwenbin";    ywb.theNum = 10;    ywb1->theabc = "yanwenbin1";}