Timeline for Write an interpreter for 99
Current License: CC BY-SA 3.0
25 events
| when toggle format | what | by | license | comment | |
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| Mar 16, 2015 at 23:34 | history | bounty ended | Calvin's Hobbies | ||
| Mar 12, 2015 at 5:28 | history | edited | Mac | CC BY-SA 3.0 |
correct bug
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| Mar 10, 2015 at 22:54 | comment | added | Timtech | +1 for pastebin.com/nczmzkFs | |
| Mar 10, 2015 at 22:20 | history | edited | Mac | CC BY-SA 3.0 |
Remove newlines from output
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| Mar 10, 2015 at 5:37 | history | edited | Mac | CC BY-SA 3.0 |
99 bottles!
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| Mar 10, 2015 at 2:14 | comment | added | Mac | @coredump: no worries! | |
| Mar 10, 2015 at 2:13 | comment | added | Mac |
@DLosc: thanks. I'm guessing the problem with the else is that a digit followed by a letter "E" is interpreted as the beginning of a scientific notation literal (e.g. 1e5), which then confuses the parser when it encounters the l in else when it was expecting a plus/minus sign or digit.
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| Mar 10, 2015 at 2:12 | comment | added | coredump | @Mac I just applied your trick about multiples of nine. Thanks again. | |
| Mar 10, 2015 at 2:10 | history | edited | Mac | CC BY-SA 3.0 |
deleted 3 characters in body
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| Mar 10, 2015 at 2:02 | comment | added | DLosc |
A couple more spaces to eliminate: ~- doesn't need a space before it; and since i is integer, you can replace while 0<=i with while-1<i.
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| Mar 10, 2015 at 1:58 | comment | added | DLosc |
Odd--I tested on ideone.com and it worked, but you're right, it doesn't work in the actual Python3 interpreter (3.4.0 on Ubuntu). This tips post clarifies: a number followed by an alphabetical token works in general, but not for tokens starting with e or E, and (from the comments) not for 0or either.
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| Mar 10, 2015 at 1:54 | history | edited | Mac | CC BY-SA 3.0 |
Extended unpacking FTW
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| Mar 10, 2015 at 1:50 | comment | added | Mac |
@DLosc: sorry, I misspoke - I did indeed mean the space, not the else. For example, I tried replacing print(w if L(e)%2 else chr(w%128)) with print(w if L(e)%2else chr(w%128)) and got a syntax exception.
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| Mar 10, 2015 at 1:46 | comment | added | coredump | @Mac That's nice, thanks for clarifying. | |
| Mar 10, 2015 at 1:46 | comment | added | DLosc |
Not the else itself, just the space before it. E.g. 3*n+1if n%2else n//2.
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| Mar 10, 2015 at 1:41 | comment | added | Mac |
@coredump: the way the spec is written, each variable will always have a value that is divisible by nine. I found it more concise to allow the variables to take on any value, and to only multiply/divide by nine as needed (in particular, in the goto routine and when getting the default value of the variable). As far as a user of the language is concerned, it makes no difference.
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| Mar 10, 2015 at 1:29 | comment | added | Mac |
@DLosc: regarding your first point: I too though that else after a number could be removed, but when I tried it earlier I got a syntax error. Your other tips are much appreciated though!
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| Mar 10, 2015 at 1:27 | history | edited | Mac | CC BY-SA 3.0 |
added 15 characters in body
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| Mar 10, 2015 at 1:18 | comment | added | coredump |
If I am not mistaken, in the goto case, you multiply the target address by 9, which is unnecessary (see bold part in spec.)
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| Mar 10, 2015 at 1:08 | comment | added | DLosc |
Also, to suppress the newline, Python3 lets you do print(x,end='')--"only" 7 bytes more. ;)
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| Mar 10, 2015 at 1:06 | comment | added | DLosc |
Nice work! A few Python golfing pointers: 1) Spaces before else can be removed if preceded by a number; 2) elif not any can use ~- instead of not (see this tip); 3) replace [g(j)for j in d[1:]] with list(map(g,d[1:])) to save 2 bytes, and similarly for the genexp in any(). Also, instead of using \\1, I think you could just substitute a literal space.
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| Mar 10, 2015 at 0:52 | history | edited | Mac | CC BY-SA 3.0 |
Add ungolfed version
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| Mar 10, 2015 at 0:27 | history | edited | Mac | CC BY-SA 3.0 |
Shaved a couple more bytes
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| Mar 10, 2015 at 0:17 | history | edited | Mac | CC BY-SA 3.0 |
Save several bytes by moving around the division and multiplication by 9
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| Mar 9, 2015 at 23:58 | history | answered | Mac | CC BY-SA 3.0 |