format long e          hexagonalny

A =           1.797693134862316e+308   7feffffffffffffe

B =           9.979201547673599e+291   7c90000000000000

C =           9.979201547673599e+291   7c90000000000000



y=(A+B)+C     1.797693134862316e+308   7feffffffffffffe

Y=A+(B+C)     1.797693134862316e+308   7fefffffffffffff

r=abs(y-Y)    1.995840309534720e+292   7ca0000000000000