Function mod( a, b )

Description:
Returns the non-negative remainder of a/b. This is a modulo operation, but differs from the expression a%b in that the answer is always >=0 (as long as b is not zero).
Parameters:
a (floating point)
dividend
b (floating point)
divisor
Return Value (floating point):
non-negative remainder when dividing a by b
Examples:
Signature:
double mod(double, double)