finish 3 simple c++ programs

# ifndef STACKLIB # define STACKLIB class STACK { private:int a[5]; int counter; public:void ClearStack() { counter = 0; } bool EmptyStack() {if (counter == 0) return true; else return false;} bool FullStack() { return (counter == 5) ? true : false; } void PushStack(int x) { a[counter] = x; counter++; } int PopStack(){ counter--; return a[counter]; } }; # endif