C语言 c 中的链表（从文件中读取）
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Linked list in c (read from file)
提问by user16655
I'm very new to C-programming, and I'm having some difficulties. I'm trying to read line from line to a text file, and then add each line to a simple linked list. I have tried a lot, but I haven't found a solution. So far in my code I'm able to read from the file, but I can't understand how to save the text line for line and add it to the linked list.
我对 C 编程很陌生，我遇到了一些困难。我正在尝试从一行读取一行到一个文本文件，然后将每一行添加到一个简单的链表中。我已经尝试了很多，但我还没有找到解决方案。到目前为止，在我的代码中，我能够从文件中读取，但我无法理解如何保存文本行并将其添加到链接列表中。
This is what I have so far:
这是我到目前为止：
struct list {
char string;
struct list *next;
};
typedef struct list LIST;
int main(void) {
FILE *fp;
char tmp[100];
LIST *current, *head;
char c;
int i = 0;
current = NULL;
head = NULL;
fp = fopen("test.txt", "r");
if (fp == NULL) {
printf("Error while opening file.\n");
exit(EXIT_FAILURE);
}
printf("File opened.\n");
while(EOF != (c = fgetc(fp))) {
printf("%c", c);
}
if(fclose(fp) == EOF) {
printf("\nError while closing file!");
exit(EXIT_FAILURE);
}
printf("\nFile closed.");
}
If anyone could give me some pointers on what I need to do next to make it work, I would highly appreciate it. I'm used to Java, and somehow my brain can't understand how to do these things in C.
如果有人能给我一些关于我接下来需要做什么才能使它工作的指示，我将不胜感激。我习惯了 Java，不知何故，我的大脑无法理解如何用 C 来做这些事情。
采纳答案by BLUEPIXY
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct list {
char *string;
struct list *next;
};
typedef struct list LIST;
int main(void) {
FILE *fp;
char line[128];
LIST *current, *head;
head = current = NULL;
fp = fopen("test.txt", "r");
while(fgets(line, sizeof(line), fp)){
LIST *node = malloc(sizeof(LIST));
node->string = strdup(line);//note : strdup is not standard function
node->next =NULL;
if(head == NULL){
current = head = node;
} else {
current = current->next = node;
}
}
fclose(fp);
//test print
for(current = head; current ; current=current->next){
printf("%s", current->string);
}
//need free for each node
return 0;
}
