Initial values: 
x = 12345
y = 9876543210123456789
r1 = 0
r2 = 0
r3 = 0

Enter first number: 987654987654 
Enter second number: 987654987654
You entered:
  x = 987654987654
  y = 987654987654
Assigning r1 = y ...
  r1 = 987654987654
(x <= y) is TRUE
(x >= y) is TRUE
(x == y) is TRUE
The sum (x + y) = 1975309975308
The product (x * y) = 975462374637822892423716

The sum (x + 12345) = 987654999999
The product (y * 98765) = 97545744855647310

Assuming that the Fibonnaci sequence begins 1,1,2,3,5,8,13...

The 10th Fibonnaci number   = 55

The 100th Fibonnaci number  = 354224848179261915075

The 1000th Fibonnaci number = 43466557686937456435688527675040625802564660517371
78040248172908953655541794905189040387984007925516929592259308032263477520968962
3239873322471161642996440906533187938298969649928516003704476137795166849228875

The 2000th Fibonnaci number = 42246963333923048787067256023414827825798528402506
81098010280137314308584370130707224123599639141511088446087538909603607640194711
64359602927198331259873732625355580260699158591522949245390499872225679531698287
44824729922639018337167780606070116154978867198798583114688708762645973690867228
84023654422295243347964480139515349562972087652656069529806499841977448720155612
802665404554171717881930324025204312082516817125