def f( x, y ) :
    ''' Solves the eval.f() homework 24 problem description
    '''

    pass




''' DO NOT MODIFY THE BELOW CODE ''''

if ( __name__ == '__main__' ) :
    import eval

    x1 = [ ];                y1 = [ ]
    x2 = [ 3, 1, 4 ];        y2 = [ ]
    x3 = [ ];                y3 = [ 2, 7, 8 ]
    x4 = [ 3, 1, 4 ];        y4 = [ 1, 5, 1, 9 ]

    z1 = eval.f( x1, y1 );   print( 'f( x1, y1 ) =', z1 )
    z2 = eval.f( x2, y2 );   print( 'f( x2, y2 ) =', z2 )
    z3 = eval.f( x3, y3 );   print( 'f( x3, y3 ) =', z3 )
    z4 = eval.f( x4, y4 );   print( 'f( x4, y4 ) =', z4 )