[英]Hashing, linked list, delete node
我的任務是從指向結構的指針數組中刪除一個節點。
我的代碼不起作用,我也不知道為什么:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Jmena4.h"
#define LENGTH 101
#define P 127
#define Q 31
typedef struct node {
char *name;
struct uzel *next;
} NODE;
int hash(const char Name[]) {
int i;
int n = strlen(Name);
int result;
result = Name[0] * P + Name[1] * Q + Name[n - 1] + n;
return result % LENGTH;
}
void Insert(NODE *array[], const char *name) {
NODE *u;
int h;
u = (NODE*)malloc(sizeof(NODE));
u->name = name;
h = hash(name);
u->next = array[h];
array[h] = u;
}
int Search(NODE *array[], const char *name) {
NODE *u;
u = array[hash(name)];
while (u != NULL) {
if (strcmp(u->name, name) == 0) {
printf("%s\n", u->name);
return 1;
}
u = u->next;
}
printf("Name: %s wasn't found\n", name);
return 0;
}
int Delete(NODE *array[], const char *name) {
NODE *current;
NODE *previous;
int position = hash(name);
current = array[position];
previous = NULL;
while (current != NULL) {
if (strcmp(current->name, name) == 0) {
if (previous == NULL) {
array[position] = current->next;
return 1;
} else {
previous->next = current->next;
current = NULL;
return 1;
}
}
previous = current;
current = current->next;
}
return 0;
}
int main() {
int i;
NODE *array[LENGTH];
for (i = 0; i < LENGTH; i++) {
array[i] = NULL;
}
for (i = 0; i < Pocet; i++) {
Insert(array, Jmena[i]);
}
for (i = 0; i < PocetZ; i++) {
Delete(array, JmenaZ[i]);
}
Search(array, "Julie");
system("PAUSE");
return 0;
}
編輯1:我更改了變量的名稱,而不是position = array[position]
應該是current = array[position]
,但是它仍然不起作用。
編輯2:在數組Jmena中是字符串“ Julie”,我可以在插入函數之后搜索它,但是從JmenaZ中刪除了不包括“ Julie”程序輸出的字符串之后,是:名稱:未找到Julie。
一方面,在while
循環中測試current
之前不會對其進行初始化。
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