The “Default Constructor”

• If you don’t give a class a constructor, a “default constructor” is generated -- a constructor that takes no arguments and does nothing (we’ll see why this is important shortly)

class counter {

private:

int counter_p;

public:

void increment() { counter_p++; }

void decrement() { counter_p--; }

void get_value() { return counter_p; }

};

counter a;

a.increment();

cout << a.get_value(); // Undefined - a was not initialized

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