What happens when you attempt to compile and run the following code? Choose all possible answers.
#include <iostream>
using namespace std;
class C {
public:
int _c;
C():_c(0){}
C(int c) { _c = c;}
C operator+=(C & b) {
C tmp; tmp._c = _c+b._c;
return tmp;
} };
ostream & operator<<(ostream & c, const C & v) {
c<<v._c; return c; }
template <class T>
class A {
T _v;
public:
A() {}
A(T v): _v(v){}
T getV() { return _v; }
void add(T & a) { _v+=a; }
};
int main()
{
A<int> b(2);
A<C> a (5);
a.add(C());
cout << a.getV() <<endl;
return 0;
}