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Forum Index : Microcontroller and PC projects : Snakes and Ladders - or How to initialize arrays
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Nimue Guru  Joined: 06/08/2020 Location: United KingdomPosts: 425 |
Hi all Apologies for lack of posting - been seriously ill for the last 4 months. Back now and 50% vaccinated to boot. I am converting some Python code (don't hate me for mentioning the big P) that uses dictionary data types to store the positions and actions for landing on a snake or ladder in the board game. Board_Layout = {10:33,16:37,21:41,23:2,34:15,35:54,44:76,52:31,62:43,80:99,89:68,95:74} So you roll the dice and look up the value in the dictionary and go to that square. For example, if you land on a 10 - this is a ladder and takes you to 33. Quite simple. To convert this to basic, I'm going to use an array dimensioned to be 100 long (for each square on the board. (Option Base 1) - DIM Board(100). So in my example Board(10)=33 would simulate the dictionary. In the cases where there is no snake or ladder, I want the array to store its index value. For example Board(1)=1, Board(2)=2 etc. In this case, when a player lands on 2, as there is no snake or ladder, it just returns the index. My question is: Can I initialize an array with the each element equal to it's index. In C++ I can do: int list[4] = {2, 4, 6, 8}; to initialise with values. I know... I could write a loop to fill the array with the indexes and then define the board I could just check for array elements that are 0, and then do nothing. Curious if there are any clever initialising tips. Cheers Nim Entropy is not what it used to be |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8297 |
MMBasic supports this: OPTION BASE 1 DIM board(5)=(1,2,3,4,5) which would write the values 1,2,3,4,5 into board(1),board(2) etc. There's no way to automatically initialise with its index value AFAIK. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Nimue Guru Joined: 06/08/2020 Location: United KingdomPosts: 425 |
That's good to know. Verbose, but I could: DIM board(100)=(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100) Nice! Thank you. N Entropy is not what it used to be |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10610 |
Here is a silly way  option base 1 dim integer a(100),board(100) sort a(),board() erase a() |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8297 |
I still prefer For i=1 to 100:board(i)=i:next It's hardly slow... and a hell of a lot less typing. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8297 |
That's neat, Peter. :) I wish I understood it.... lol Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Nimue Guru Joined: 06/08/2020 Location: United KingdomPosts: 425 |
Nice and elegant - I like and an interesting use case for sort and storing the index. N Entropy is not what it used to be |
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| Nimue Guru Joined: 06/08/2020 Location: United KingdomPosts: 425 |
Yup - this is the way I went with at the time - just seemed like initialising with the index might have been done somewhere. The "beauty" of this way is that my students can instinctively see what is going on. Cheers N Entropy is not what it used to be |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10610 |
With 5.07.01b4 you can also go option base 1 dim board(100) data 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 data 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 data 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 data 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 data 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 read board() Not very useful for an index but very useful if the numbers are non-sequential |
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Lodovik Regular Member  Joined: 17/05/2021 Location: CanadaPosts: 41 |
Very useful trick. I didn't knew that you could read an entire array at once. I've not seen this in the documentation and I've read most of it. Must have missed this somehow. I'll put this to good use, thanks. |
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