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class ArrayStack

{

int[] stack;

int size, head;

public ArrayStack(int size)

{

stack = new int[size];

this.size = size;

head = -1;

}

public boolean isEmpty()

{

return head == -1;

}

public boolean isFull()

{

return head == size-1;

}

public boolean push(int data)

{

if(isFull())

return false;

stack[++head] = data;

return true;

}

public int pop()

{

if(isEmpty())

return -1; // -1 is used to indicated error

return stack[head--];

}

}