@Override
    public void ceil()
    {
        if (top < 1)
        {
            throw new EmptyStackException();
        }
        stack[top-1] = Math.ceil(stack[top-1]);
    }
@ Override public void ceil ( ) { if ( top < 1 ) { throw new EmptyStackException ( ) ; } stack [ top - 1 ] = Math . ceil ( stack [ top - 1 ] ) ; }
@see java.lang.Math#ceil(double)