$Mod
The $MOD function returns the remainder that results when the first argument is divided by the second argument (the first argument modulo the second argument). Each argument is first rounded to an integer. $MOD (X,0) is defined to be X.
Example 1
$MOD (5,3)
equals 2.
Example 2
IF $MOD (Z,2) THEN PRINT 'ODD'
prints ODD only if the value of the field Z is odd.