Two objects same or not program in C++ language

#include<iostream>
using namespace std;
class demo
{
int a,b;
public:
void get()
{
cout<<"enter a number:";
cin>>a;
cout<<"enter another number:";
cin>>b;
}
int check(demo d1,demo d2)
{
if (d1.a==d2.a && d1.b==d2.b)
{
return 0;
}
else
{
return 1;
}
}
};
int main()
{
int flag;
demo a1,a2;
a1.get();
a2.get();
flag=a1.check(a1,a2);
if (flag==1)
    {
    cout<<"number is not same";
}
else
{
cout<<"number is same";
}
return 0;
}

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