(48G) GCD: Greatest Common Divisor

[rprosperi]

(08-31-2018 11:40 PM)Albert Chan Wrote:  Turns out, we are both right (with Werner's program):

With approx mode: 54 0 GCD returns 54 (calculator assumed 54 % 0 = 54)
Under exact mode: 54 0 GCD returns '?' (technically, 54 % 0 is undefined)

In fact, Werner's code will not work in exact mode at all, except for initial Y = 0.
It always return '?', because X always reduced to zero, causing undefined Y % X.

Hp50g emulator is fun

Regardless of the mode the 50g is set to (Exact or Approximate), it interprets numbers as approximate or exact based on the format of the number provided. Approximate numbers always must include a decimal point, and Exact numbers never include a decimal point.

So even in Exact Mode, entering 54. 0. GCD will treat the parameters as approximate.

In my case I was actually testing with a 48GX; there is no distinction of type here, all numbers are approximate, even if entered as "54 0 GCD".

I agree the 50g emulator is great, but an actual device is even more satisfying (although not as fast for extended computations).