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annotate c/bitVector/main.cc @ 52:a2826bf4e80a

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remove magic number
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 04 Jun 2015 17:54:13 +0900
parents 898e8d9e1c67
children 3d1c71fbd4a4
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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5 int bitBlock = sizeof(unsigned long) * 8;
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7 typedef struct bitInfo {
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8 int arrayNum;
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9 unsigned long *bitContainer;
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10 }BitInfo,*BitInfoPtr;
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12 void bitSet(BitInfoPtr bi, int bitSetPosition) {
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14 unsigned long tmp = 1;
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15 int arrayPosition = 0;
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17 arrayPosition = bitSetPosition / bitBlock;
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18 bitSetPosition = bitSetPosition % bitBlock;
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19
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20 tmp = tmp << (bitBlock - 1 - bitSetPosition);
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21 bi->bitContainer[arrayPosition] = bi->bitContainer[arrayPosition] | tmp;
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22 }
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24 void bitPrint(BitInfoPtr bi) {
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25 for (int i = 0; i < bi->arrayNum ; i++) {
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26 for (int j = bitBlock - 1; j >= 0; j--) {
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27 printf( "%lu", ( bi->bitContainer[i] >> j ) & 1 );
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28 }
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29 printf(" ");
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30 }
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31 puts("");
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32 }
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34 int main(int argc, char **argv) {
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36 BitInfoPtr bi = (BitInfoPtr)malloc(sizeof(BitInfo));
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37 int bitSetPosition = 0;
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39 for (int i = 1; i < argc ; i++) {
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40 if (strcmp(argv[i],"-n") == 0) {
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41 bitSetPosition = atoi(argv[i+1]);
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42 }
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43 }
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45 bi->arrayNum = (bitSetPosition + 1) / bitBlock;
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46 if (((bitSetPosition + 1) % bitBlock) != 0) bi->arrayNum++;
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48 printf("Array Num : %d\n",bi->arrayNum);
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50 unsigned long bitContainer[bi->arrayNum];
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51 for (int i = 0; i < bi->arrayNum; i++) {
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52 bitContainer[i] = 0;
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53 }
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55 bi->bitContainer = bitContainer;
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56 bitSet(bi,bitSetPosition);
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57 bitPrint(bi);
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58 return 0;
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59 }