What is the output of the following snippet? #include <iostream> using namespace std; class A { friend class B; private: int field; public: int set(int x) { return field = ++x; } int get() { return ++field; } }; class B { public: void kill(A &a) { a.field = 0; } }; int main() { A a; B b; a.set(1); b.kill(a); cout << a.get(); return 0; } 0 Compilation fails 2 1

The output of the given C++ code snippet will be 1.

Here's the step by step explanation:

1. Class A is defined with a private integer field, a public set method that increments the input and assigns it to the field, and a get method that increments the field and returns it. Class B is declared as a friend of Class A, which means it can access A's private and protected members.

2. Class B is defined with a public method kill that takes an object of Class A as a reference and sets its field to 0.

3. In the main function, objects of Class A and Class B are created.

4. The set method of Class A is called with 1 as the argument. This increments 1 to 2 and assigns it to the field.

5. The kill method of Class B is called with the object of Class A as the argument. This sets the field of Class A to 0.

6. The get method of Class A is called, which increments the field from 0 to 1 and prints it.

So, the output will be 1.