Common types of integer division:

  T: Truncated (the quotient is truncated toward 0)
  F: Floored   (the quotient is floored toward -infinity)
  E: Euclidean (the remainder is always positive)

C89 requires Truncated semantics for div(), but not for / and %.
C99 and newer require Truncated semantics for / and % (and for div() too).

             T     F     E

 33 /  5     6     6     6
 33 %  5     3     3     3
 
-33 /  5    -6    -7    -7
-33 %  5    -3     2     2
 
 33 / -5    -6    -7    -6
 33 % -5     3    -2     3
 
-33 / -5     6     6     7
-33 % -5    -3    -3     2

             T     F     E

 30 /  5     6     6     6
 30 %  5     0     0     0
 
-30 /  5    -6    -6    -6
-30 %  5     0     0     0
 
 30 / -5    -6    -6    -6
 30 % -5     0     0     0
 
-30 / -5     6     6     6
-30 % -5     0     0     0

             T     F     E

  0 /  5     0     0     0
  0 %  5     0     0     0
 
  0 / -5     0     0     0
  0 % -5     0     0     0