Exam CPP topic 2 question 124 discussion

What happens when you attempt to compile and run the following code?
#include <vector>
#include <iostream>
using namespace std;
class A
{
int a,b;
public:
A & operator =(const A & c) { a = c.a; return *this;}
A():a(0),b(0){}
void setA(int a) {this?>a = a;} void setB(int b) {this?>b = b;} int getA() {return a;} int getB() {return b;}
};

int main ()
{
vector<A>v;
A a;
a.setA(10); a.setB(11);
v.push_back(a);
A b = v.front(); v.pop_back();
cout<<b.getB()<<" "<<b.getA()<<endl;
return 0;
}