#include
#include
using namespace std;
class sometype {
int a[3];
public:
sometype(int i, int j, int k)
{
a[0] = i;
a[1] = j;
a[2] = k;
}
int &operator[](int i);
};
int &sometype::operator[](int i)
{
if (i<0 || i>2)
{
cout << "Boundary error.\n";
exit(1);
}
return a[i];
}
int main(void)
{
sometype ob(1, 2, 3);
cout << ob[1];
cout << endl;
ob[1] = 25;
cout << endl;
cout << ob[1];
ob[3] = 44;
}