Functions for the rational mode

INTSQR(x) the value of the positive square root of x truncated to an integer.
NUMER(x) The numerator of x.
DENOM(x) The denominator of x.
GCD(x,y) The Greatest Common Divisor of x and y.
Results have positive signs. If both x and y are equal to zero, the exception with extype 3006 shall be raised.