rem( +10, +8 ) = 2 mod( +10, +8 ) = 2 rem( +10, -8 ) = 2 mod( +10, -8 ) = 2 rem( -10, +8 ) = -2 mod( -10, +8 ) = 6 rem( -10, -8 ) = -2 mod( -10, -8 ) = 6