Card shuffling?

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Socoder -> C/C++/C#/Other -> Card shuffling?
Thu, 15 Feb 2018, 13:42
spinal	Card shuffling? So I've started working on a solitaire game, however for some reason I seem to have 2 of my '0' cards, in the case of my current gfx, that's the ace of spades. I wonder if the shuffle routine has something to do with it? Can anyone see some stupidity in the following? void shuffle(){ // arrange deck before shuffle for(int t=0; t<52; t++){ deck1[t]=t; // order cards by number faceUp[t]=0; // make cards face down } // shuffle deck for(int t=0; t<52; t++){ int temp = random(52); int tmp = deck1[temp]; deck1[temp]=deck1[t]; deck1[t]=tmp; } } --v -=-=- Check out my excellent homepage!
Thu, 15 Feb 2018, 13:51
spinal	Found it! (I think)... int temp = random(52); --v should be int temp = random(51); --v I think I was shuffling a non-existing card into the deck... -=-=- Check out my excellent homepage!
Thu, 15 Feb 2018, 14:07
GfK	Sounds reasonable. I'd probably run that For loop multiple times to get extra shufflage. Guessing it's a one shot deal, not every frame, so even if it takes a few millisecs it's no issue.
Thu, 15 Feb 2018, 14:23
Jayenkai	Surprisingly, I've found that this sort of shuffle works best if done only once. Since it's shuffling every single card in the deck, it's not like a human shuffle where you miss out clumps at a time. If you start with a stacked deck and shuffle more than once with this method, you'll see some really freaky shit happening!! Not really sure why that is. -=-=- ''Load, Next List!''
Thu, 15 Feb 2018, 16:42
therevillsgames	Constants are your friends...
Fri, 16 Feb 2018, 00:11
spinal	They may be, but it would have still taken me an hour to figure out that I needed NUMBEROFCARDS-1... -=-=- Check out my excellent homepage!
Fri, 16 Feb 2018, 01:06
therevillsgames	Should be MAX_CARDS = 51... void shuffle(){ // arrange deck before shuffle for(int t=0; t<=MAX_CARDS; t++){ deck1[t]=t; // order cards by number faceUp[t]=0; // make cards face down } // shuffle deck for(int t=0; t<=MAX_CARDS; t++){ int temp = random(MAX_CARDS); int tmp = deck1[temp]; deck1[temp]=deck1[t]; deck1[t]=tmp; } } --v
Fri, 16 Feb 2018, 01:57
Jayenkai	Eeeuw.. Horrible number complications!!! I've always been one to hardcode lots of numbers. Doing this framework, I'm really trying my best to switch to using const/define values, but even still.. .. Max_Cards = 52!! It should always be 52 cards!!! -=-=- ''Load, Next List!''
Fri, 16 Feb 2018, 02:53
therevillsgames	But zero is also a card in Spinal's example, so you will have 53 cards... unless you want to do MAX_CARDS - 1 everywhere which is double eeuw! I use a list to store my cards anyway, so I do have MAX_CARDS set at 52