C/C++中new关键字是否加括号的区别

#include <iostream>

using namespace std;

class A{
public:
int a;
};

int main(){

A *a1 = new A;
A *a2 = new A();
cout<<a1->a<<endl;
cout<<a2->a<<endl;

A a3;
cout<<a3.a<<endl;

return 0;
}

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A a;
A a();