Last change
on this file since 122 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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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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