What happens when you attempt to compile and run the following code?

#include

using namespace std;

class Base {

int age;

public:

class C {

int b;

void PrintC() { cout << b; }

};

Base () {age=5;};

void setAge(int a=20) {age = a;}

void Print() { cout << age;}

};

int main () {

Base a;

a.setAge(10);

a.Print();

return 0;

}