/prog/ - Trains in Switzerland must not have exactly 256 axles

Name: Anonymous 2016-07-11 20:14

Trains in Switzerland must not have exactly 256 axles, or the signalling system gets confused.

http://imgur.com/DrEinPB

Name: Anonymous 2016-07-12 8:17

using 16-bit integers would be bloat

Name: Anonymous 2016-07-12 8:57

It can have more than 256, but not exactly 256?

Name: Anonymous 2016-07-12 9:43

>>3
according to the picture, 256 overflows and resets axle counter to zero and the train disappears from the system. this means that the counter is effectively % 256 so trains with more axles will not have the correct value displayed but only multiples of 256 would disappear

Name: Anonymous 2016-07-12 11:04

0xff used as special init value to show uninitialized?

Name: Anonymous 2016-07-12 11:53

>>5
0xff is 255, not 256.
In their software, 256 axles would wrap from 255 to 0, the same result as if there were no train at all.
Quality software.

Name: Anonymous 2016-07-16 18:34

This wouldn't have happened if they used a strongly-typed language like Haskell.

Name: Anonymous 2016-07-16 19:40

How do you make strongly-typed assembly?

Name: Anonymous 2016-07-16 20:35

>>8
http://www.cs.cornell.edu/Info/People/jgm/palo-alto/

Name: Anonymous 2016-07-16 21:31

>>8
Hardware type tags, non-orthogonal register files, etc.

Name: Anonymous 2016-07-17 1:08

_{(this space left intentionally blank)}

Name: Anonymous 2016-07-17 2:31

>>8
Proof carrying code

Trains in Switzerland must not have exactly 256 axles

1 Name: Anonymous 2016-07-11 20:14

2 Name: Anonymous 2016-07-12 8:17

3 Name: Anonymous 2016-07-12 8:57

4 Name: Anonymous 2016-07-12 9:43

5 Name: Anonymous 2016-07-12 11:04

6 Name: Anonymous 2016-07-12 11:53

7 Name: Anonymous 2016-07-16 18:34

8 Name: Anonymous 2016-07-16 19:40

9 Name: Anonymous 2016-07-16 20:35

10 Name: Anonymous 2016-07-16 21:31

11 Name: Anonymous 2016-07-17 1:08

12 Name: Anonymous 2016-07-17 2:31