Static Data: Example

// note, private protection is default

static int a = 0; // only static members can be initialized

// this way; normally, use the constructor

int b;

public:

sample() { a++; b=0; printf("STARTING: a=%d, b=%d\n", a, b); }

~sample() { printf("FINISHED: a=%d, b=%d\n", a, b); a--; b--; }

};

// memory for the static member must be defined somewhere!

// you could also initialize "a" here instead of in the class

int sample::a;

main()

{

sample s1; // STARTING: a=1, b=0

sample s2; // STARTING: a=2, b=0

sample s3; // STARTING: a=3, b=0

// FINISHED: a=3, b=0… FINISHED: a=2, b=0… FINSIHED: a=1, b=0

}