1 123 1.23 0.123 4. .4 1.23e3 1.23e-3 1 div 0 -1 div 0 0 div 0 1 div -0 (1 div 0) > 0 (1 div 0) < 0 (-1 div 0) > 0 (-1 div 0) < 0 (0 div 0) > 0 (0 div 0) < 0 (1 div -0) > 0 (1 div -0) < 0 0 div 0 = 0 div 0 0 div 0 != 0 div 0 0 div 0 > 0 div 0 0 div 0 < 0 div 0 0 div 0 >= 0 div 0 0 div 0 <= 0 div 0 1 div 0 = -1 div 0 1 div 0 != -1 div 0 1 div 0 > -1 div 0 1 div 0 < -1 div 0 1 div 0 >= -1 div 0 1 div 0 <= -1 div 0 1 div 0 = 1 div 0 1 div 0 != 1 div 0 1 div 0 > 1 div 0 1 div 0 < 1 div 0 1 div 0 >= -1 div 0 1 div 0 <= -1 div 0 -2 div 0 = -1 div 0 1 div floor(0.1) 1 div floor(-0.1) 1 div floor(-0) 1 div floor(0) 1 div ceiling(0.1) 1 div ceiling(-0.1) 1 div ceiling(-0) 1 div ceiling(0) 1 div round(0.1) 1 div round(-0.1) 1 div round(-0) 1 div round(0) 1 div number('f') number('f') div 1 1 div (1 div 0) (1 div 0) div 1 -(1 div 0) div 1 5 mod 2 5 mod -2 -5 mod 2 -5 mod -2 8 mod 3 = 2