X

X-register, 8

1/x (reciprocal), 45, 47

  (square root/square), 45–46

x y (exchange x and y), 31

x≠y, x≤y, x=y, x>y (Relational tests of x and y), 63

Y

Y-register, 8. For functions that use the Y-register

see +, –, ×, ÷, yX, D.MS+

yX (exponential), 45, 47

Z

Z-register, 8