 *	qexp( x, y )		y = exp( x )

 *	qfloor( x, y )		y = largest integer not greater than x

 *      qlog( x, y )		y = log( x ) [natural logarithm]

 *	qpow( x, y, z )         z = x^y [x raised to the y power]

 *	qrand( q )              q = pseudorandom number in [1,2)

 *	qremain( a, b, c )	c = remainder after dividing b by a.

 *	qround( x, y )		y = nearest integer to x

 *	qsqrt( x, y )           y = sqrt( x )

 *	qtanh( x, y )		y = tanh( x ) [hyperbolic tangent]

