Last change
on this file since 125 was
102,
checked in by rosiere, 16 years ago
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Previous commit with new files :P
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Property svn:keywords set to
Id
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File size:
711 bytes
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[102] | 1 | #include "func_parite.h" |
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| 2 | |
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| 3 | // Renvoye 1 si le nombre de bit a 1 est impaire |
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| 4 | // 0 paire |
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| 5 | |
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| 6 | bool parite1(int x,int val_parite) |
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| 7 | { |
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| 8 | int mask = 1; |
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| 9 | bool res = ( (val_parite & mask) ^ mask); //si bit de poids faible à zero alors parité pair |
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| 10 | |
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| 11 | while(x!=0) |
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| 12 | { |
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| 13 | res ^= (x & mask); |
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| 14 | x = x >> 1; |
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| 15 | } |
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| 16 | |
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| 17 | return res; |
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| 18 | } |
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| 19 | |
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| 20 | |
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| 21 | extern unsigned int find_first_one (int x); |
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| 22 | |
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| 23 | bool parite2(int x,int val_parite) |
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| 24 | { |
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| 25 | unsigned int mask = 1; |
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| 26 | unsigned int pos; |
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| 27 | bool res = ( (val_parite & mask) ^ mask); //si bit de poids faible à zero alors parité pair |
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| 28 | |
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| 29 | while ((pos = find_first_one(x)) != 0) |
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| 30 | { |
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| 31 | res ^= 1; |
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| 32 | x = x >> pos; |
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| 33 | } |
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| 34 | |
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| 35 | return res; |
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| 36 | } |
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