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C++ 类对象和指针的区别

2013-01-30 21:50 274 查看

指针的情况

class Test{
public:
int a;
Test(){
a = 1;
}
};

int main()
{
Test* t1 = new Test();
t1->a = 10;

Test* t2 = new Test();
t2->a = 5;

cout << "&t1:" << t1 << " a = " << t1->a << endl;
cout << "&t2:" << t2 <<  " a = " << t2->a <<endl;

cout << "------------------------------" << endl;
t2 = t1;
cout << "&t1:" << t1 << " a = " << t1->a << endl;
cout << "&t2:" << t2 <<  " a = " << t2->a <<endl;

cout << "------------------------------" << endl;

t1->a = 111;
t2->a = 222;
cout << "&t1:" << t1 << " a = " << t1->a << endl;
cout << "&t2:" << t2 <<  " a = " << t2->a <<endl;

return 0;
}

对象的情况:

class Test{
public:
int a;
Test(){
a = 1;
}
};
int main()
{
Test t1;
t1.a = 10;

Test t2;
t2.a = 5;

cout << "&t1:" << &t1 << " a = " << t1.a << endl;
cout << "&t2:" << &t2 <<  " a = " << t2.a <<endl;

cout << "------------------------------" << endl;
t2 = t1;
cout << "&t1:" << &t1 << " a = " << t1.a << endl;
cout << "&t2:" << &t2 <<  " a = " << t2.a <<endl;

cout << "------------------------------" << endl;

t1.a = 111;
t2.a = 222;
cout << "&t1:" << &t1 << " a = " << t1.a << endl;
cout << "&t2:" << &t2 <<  " a = " << t2.a <<endl;

return 0;
}

记住：在默认情况下，将一个对象赋给同类型的另外一个对象时，C++将源对象的每个数据成员复制到目标对象中相应的数据成员中

至于不同之处，自己打印..........

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C++ 类对象和 指针的区别

C++ 类对象和指针的区别