CPP
cpp
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#include<iostream>
using namespace std;
class A
{
public:
int a;
A()
{
a =10;
cout<<"default"<<endl;
}
A(int n = 5)
{
a = n;
cout<<"param"<<endl;
}
A(const A &p)
{
a = p.a;
cout<<"copy"<<endl;
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