Constructors: Another Example

main()

{

counter apples; // Constructor called!

counter oranges; // Constructor called!

// Note, we haven’t explicitly initialized

// the counter to 0 -- the constructor

// does it for us

apples.increment_counter();

apples.increment_counter();

printf(“%d apples and %d oranges!\n”,

apples.query_counter(), // 2

oranges.query_counter()); // 0

}

class counter {

public: // ignore this for now

int i;

// Normal member functions

void increment_counter() { i++; }

void decrement_counter() { i--; }

int query_counter() { return i; }

void set_counter(int new_value) {

i = new_value;

}

// The constructor -- it has the same

// name as the class itself

counter() { i = 0; }

};

Previous slide

Next slide

Back to first slide

View graphic version