//Stack.cc
#include <iostream>
#include "Stack.hh"

void Stack::push(double c) { 
	if (full()) {
		std::cout << "Stack::push() Error: stack is full" << std::endl ;
		
		grow( DELTA );
	}
	s[count++] = c ;
}

double Stack::pop() { 
	if (empty()) {
		std::cout << "Stack::pop() Error: stack is empty" << std::endl ;
		return 0 ;
	}		
	return s[--count] ;
}

void Stack::inspect() {
	for ( int i = nitems() - 1; i >= 0; i-- )
	{
		std::cout << i << ": " << s[i] << std::endl;
	}
}

void Stack::init( int in_size ) { 
	bufsize = in_size ;
	count = 0 ;

	s = new double[in_size];
}
void Stack::grow( int delta ) {
	std::cout << "Growing by " << delta << std::endl;
	double* newbuf = new double[ bufsize + delta ];

	// Copy elements
	for ( int i=0; i < count ; i++ )
	{
		newbuf[i] = s[i];
	}

	// Delete old Stack
	delete[] s;

	// Assign pointer
	s = newbuf;
}