5.4 Similarities and differences between rem and mod

rem and mod are quite similar – they only differ if dividend and divisor have different signs:

• With rem, the result has the same sign as the dividend (first operand):

  > 5 rem 4
  1
  > -5 rem 4
  -1
  > 5 rem -4
  1
  > -5 rem -4
  -1

• With mod, the result has the same sign as the divisor (second operand):

  > 5 mod 4
  1
  > -5 mod 4
  3
  > 5 mod -4
  -3
  > -5 mod -4
  -1