C++关于类的成员函数的调用问题
#include <iostream>
using namespace std;
class A{
public:
A(){};
~A(){}
void Print(){
cout<<"A"<<endl;
}
virtual void Print2(){
cout<<"A2"<<endl;
}
void display(){
cout<<a<<endl;
}
private:
int a=2;
};
int main()
{
A* a;
a->Print();
a->Print2();
a->display();
}
using namespace std;
class A{
public:
A(){};
~A(){}
void Print(){
cout<<"A"<<endl;
}
virtual void Print2(){
cout<<"A2"<<endl;
}
void display(){
cout<<a<<endl;
}
private:
int a=2;
};
int main()
{
A* a;
a->Print();
a->Print2();
a->display();
}
为什么a->Print();能调用成功而后面两行调用都会出现段错误呢
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