public LibStack push(Library lib)
{
LibStack l = new LibStack(lib);
l.next = this;
return(l);
}
public Library pop()
{
Library L = library;
if (next != null)
{
library = next.library;
next = next.next;
}
return(L);
}
public LibStack(Library lib)
{
library = lib;
next = null;
}