用C语言对数据集adult.data.txt进行k匿名处理,要求输入参数k,自动生成k匿名结果
时间: 2024-02-12 14:02:38 浏览: 31
好的,让我给你提供一些代码实现的思路。
首先,我们需要读取数据集adult.data.txt,可以使用C语言的文件读取函数,如fopen、fscanf等。读取后,我们需要将数据集保存在内存中,可以使用结构体数组来表示每个记录,结构体中包含数据集中的各个属性。结构体的定义可以参考如下:
```c
#define MAX_LINE_LEN 1024
typedef struct Record {
int age;
char workclass[MAX_LINE_LEN];
int fnlwgt;
char education[MAX_LINE_LEN];
int education_num;
char marital_status[MAX_LINE_LEN];
char occupation[MAX_LINE_LEN];
char relationship[MAX_LINE_LEN];
char race[MAX_LINE_LEN];
char sex[MAX_LINE_LEN];
int capital_gain;
int capital_loss;
int hours_per_week;
char native_country[MAX_LINE_LEN];
char income[MAX_LINE_LEN];
} Record;
```
然后,我们需要将数据集根据属性值映射为k个记录的等价类。可以使用哈希表来实现,将每个记录插入到对应的哈希表中,哈希表的键为属性值的组合,值为一个记录的列表。具体实现可以参考如下:
```c
#include <stdlib.h>
#include <string.h>
#define HASH_TABLE_SIZE 1024
typedef struct HashNode {
char key[MAX_LINE_LEN];
Record *value;
struct HashNode *next;
} HashNode;
typedef struct HashTable {
int size;
HashNode **table;
} HashTable;
HashTable *createHashTable() {
HashTable *ht = (HashTable *) malloc(sizeof(HashTable));
ht->size = HASH_TABLE_SIZE;
ht->table = (HashNode **) calloc(ht->size, sizeof(HashNode *));
return ht;
}
unsigned long hash(const char *str) {
unsigned long hash = 5381;
int c;
while ((c = *str++)) {
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
}
return hash;
}
Record *createRecord(const char *line) {
Record *record = (Record *) malloc(sizeof(Record));
// 解析line,填充record的各个属性
return record;
}
void insertRecord(HashTable *ht, Record *record) {
char key[MAX_LINE_LEN];
sprintf(key, "%s,%d,%s,%s,%s,%s,%s,%s,%s,%d,%d,%d,%s,%s",
record->workclass, record->age, record->education, record->education_num,
record->marital_status, record->occupation, record->relationship, record->race,
record->sex, record->capital_gain, record->capital_loss, record->hours_per_week,
record->native_country, record->income);
unsigned long index = hash(key) % ht->size;
HashNode *node = (HashNode *) malloc(sizeof(HashNode));
strcpy(node->key, key);
node->value = record;
node->next = ht->table[index];
ht->table[index] = node;
}
HashTable *buildHashTable(const char *filename) {
HashTable *ht = createHashTable();
FILE *fp = fopen(filename, "r");
char line[MAX_LINE_LEN];
while (fgets(line, MAX_LINE_LEN, fp)) {
Record *record = createRecord(line);
insertRecord(ht, record);
}
fclose(fp);
return ht;
}
```
接下来,我们需要检查每个等价类是否满足k-匿名条件,如果不满足,则需要进行一些变换。这里我们可以使用贪心算法,从一个等价类中选择一个记录进行变换,使得其与另一个等价类中的记录在属性上相同,从而满足k-匿名条件。变换过程可以参考如下:
```c
void anonymizeHashTable(HashTable *ht, int k) {
for (int i = 0; i < ht->size; i++) {
HashNode *node = ht->table[i];
while (node) {
// 对于每个等价类,检查是否满足k-匿名条件
if (countNodes(node) < k) {
// 如果不满足,进行变换
int found = 0;
for (int j = 0; j < ht->size && !found; j++) {
HashNode *otherNode = ht->table[j];
while (otherNode && countNodes(otherNode) < k - 1) {
otherNode = otherNode->next;
}
if (otherNode) {
// 找到另一个等价类,选择一个记录进行变换
Record *record = node->value;
node->value = otherNode->value;
otherNode->value = record;
found = 1;
}
}
}
node = node->next;
}
}
}
int countNodes(HashNode *node) {
int count = 0;
while (node) {
count++;
node = node->next;
}
return count;
}
```
最后,我们需要将处理后的数据写入文件中,可以使用C语言的文件写入函数,如fopen、fprintf等。具体实现可以参考如下:
```c
void writeHashTableToFile(HashTable *ht, const char *filename) {
FILE *fp = fopen(filename, "w");
for (int i = 0; i < ht->size; i++) {
HashNode *node = ht->table[i];
while (node) {
Record *record = node->value;
fprintf(fp, "%d,%s,%d,%s,%d,%s,%s,%s,%s,%s,%d,%d,%d,%s,%s\n",
record->age, record->workclass, record->fnlwgt, record->education,
record->education_num, record->marital_status, record->occupation,
record->relationship, record->race, record->sex, record->capital_gain,
record->capital_loss, record->hours_per_week, record->native_country,
record->income);
node = node->next;
}
}
fclose(fp);
}
```
综上所述,以上是用C语言对数据集adult.data.txt进行k匿名处理的一个大致的实现思路。具体实现还需要考虑很多细节和异常情况,需要自己仔细思考和调试。