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Join Date: Sep 2006
Posts: 63
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Junior Poster in Training
can anyone help me with this code i just cant understand !
its about filling a deck of cards
thx
its about filling a deck of cards
thx
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DarkCoder+
Yes. As i understand it's something about card game, these calculations are likely used for generating some random numbers. The % operator gives the remainder, so i % 13 always gives a number from 0 to 12, if i is positive, no matter what value i has. The << operator increases the number by shifting it left by one binary place, which means that << 1 is the same as multiplying by 2, << 2 the same as multiplying by 4, but a left shift is much faster than multiplying. What this gives is a random number which changes by a certain bigger unit, say by 4, which is sometimes necessary for a certain random behaviour. And then, i += i / 13 is just the same as i = i + i / 13...
Last edited by TkTkorrovi; Aug 21st, 2007 at 3:02 pm.
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Join Date: Nov 2005
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Posting Whiz in Training
The OP's code is also missing a closing curly bracket (}) at the end of the for loop.
This code is equivalent, but simpler:
The modulo operator is explained in detail here: http://en.wikipedia.org/wiki/Modulo_operation
This code is equivalent, but simpler:
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Last edited by dwks; Aug 21st, 2007 at 4:35 pm.
dwk
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
I see now that this code doesn't generate random numbers, but some kind of distribution, still the same applies.
Knowledge is regarded by the fool as ignorance, and the things that are profitable are to him hurtful. He liveth in death. -- Thoth the Atlantean
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Join Date: Sep 2006
Posts: 63
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Junior Poster in Training
wel this code fit inside a fuction which fill a deck of cards (52 cards)
knowing that ->
actually i cant understand the logic behind this function
is it like creating a memory space for 52 cards so we can deal with it later or just creating cards...
because there is 2 other functions that show you the deck, shuffle the deck and print the deck again(shuffled).
knowing that ->
C Syntax (Toggle Plain Text)
is it like creating a memory space for 52 cards so we can deal with it later or just creating cards...
because there is 2 other functions that show you the deck, shuffle the deck and print the deck again(shuffled).
C Syntax (Toggle Plain Text)
DarkCoder+
Actually, I don't understand it, either. The shifting and adding 64 makes no sense.
Since a deck has 52 cards, the loop is going through all the possible cards of the deck (0-51). Then
If you want to shuffle the deck, you can then yse the random generator to move cards to different random positions.
Since a deck has 52 cards, the loop is going through all the possible cards of the deck (0-51). Then
(i / 13) gives you 0-4, representing the suit of the given card. (i % 13) gives the value or rank of the card (0-12). Therefore, if i is 5 you get the 6 of Hearts.If you want to shuffle the deck, you can then yse the random generator to move cards to different random positions.
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