Write a class that uses an array to implement a stack of integers.

The stack should have the following fields:

int [ ]s; // Holds stack elements

int top = -1; // Points to last item pushed

The field top will point to an item that is actually stored on the stack, instead of pointing to

the next available slot. The stack will set top to 1 when it is empty. Write the constructor for

this class, and all the usual stack methods.