c - 如何从文件填充链接列表

Question

我正在尝试填充从文件读取的链接列表。我一直在尝试使用 strtok() 将 "" 用作分隔符的字符串分开。当我调用我的 addEntry() 函数时，它只是将每个字符串的第一个字母添加到一个新节点。我意识到这可能是一个简单的疏忽，所以请原谅我的无知，因为我对编码还很陌生。

我遇到问题的具体代码部分是:

void readData(struct boggleDataNode **headRef){
    //initializing variables including
    //opening the input file
    int counter = 96;
    int i = 0;
    char dataLine[LENGTH];
    char *data;
    char *fileName = "BoggleData.txt";
    FILE *filePointer;

    printf("Trying to open file %s\n", fileName);
    filePointer = fopen(fileName, "r"); //read mode
    printf("Successfully opened file %s\n", fileName);

    if (filePointer == NULL){
        perror("Error while opening file. \n");
        exit(0);
    }

    //loop until find end of file
    while ( fgets(dataLine, LENGTH, filePointer) != NULL){
        //I feel like i should be using a nested loop here but I can't figure out how to do it 
        printf("dataLine = %s\n", dataLine);
        data = strtok(dataLine, " ");
        printf("data = %s\n", data);
        //fgets(data, 3, filePointer);
        addEntry(headRef, data);
        //nested loop should end here
    }
}

我的输出只有 16 个节点，每行的第一个字母，而它应该有 96 个节点长。我正在阅读的文件是:

D R L X E I
C P O H S A
N H N L Z R
W T O O T A
I O S S E T
N W E G H E
B O O J A B
U I E N E S
P S A F K F
I U N H M Qu
Y R D V E L
V E H W H R
I O T M U C
T Y E L T R
S T I T Y D
A G A E E N

---

如果需要完整代码:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define LENGTH 80

struct boggleDataNode {
    char data[3];
    struct boggleDataNode *nextData;
};

struct boggleDieSideNode {
    char dieSideData[3];
    struct boggleDieSideNode *nextSide;
};

void readData(struct boggleDataNode **);
void addEntry(struct boggleDataNode **, char *);
void display(struct boggleDataNode *);

int main() {

    int counter = 0;

    struct boggleDataNode * head = NULL;
    struct boggleDieSideNode *head1 = NULL;
    readData(&head);
    display(head);

    system("pause");
    return 0;
}

void readData(struct boggleDataNode **headRef){
    //initializing variables including
    //opening the input file
    int counter = 96;
    int i = 0;
    char dataLine[LENGTH];
    char *data;
    char *fileName = "BoggleData.txt";
    FILE *filePointer;

    printf("Trying to open file %s\n", fileName);
    filePointer = fopen(fileName, "r"); //read mode
    printf("Successfully opened file %s\n", fileName);

    if (filePointer == NULL){
        perror("Error while opening file. \n");
        exit(0);
    }

    //loop until find end of file
    while ( fgets(dataLine, LENGTH, filePointer) != NULL){
        printf("dataLine = %s\n", dataLine);
        data = strtok(dataLine, " ");
        printf("data = %s\n", data);
        //fgets(data, 3, filePointer);
        addEntry(headRef, data);
    }

    fclose(filePointer);

}//cose readData

void addEntry(struct boggleDataNode **headRef, char *data){

    //allocate node
    struct boggleDataNode* temp = (struct boggleDataNode*) malloc(sizeof(struct boggleDataNode));

    //put in data
    strcpy(temp->data, data);

    // link the old list off the new node
    temp->nextData = (*headRef);

    // move the head to point to the new node
    (*headRef) = temp;
}

void display(struct boggleDataNode *headRef){

    struct boggleDataNode *helper = headRef;

    if (helper == NULL){
        return;
    }
    else{
        printf("============================================\n");
        printf("Node #        Data\n");
        printf("============================================\n");

        int counter = 1;

        while (helper != NULL){
            printf("%5d \t %2s\n", counter++, helper->data);
            helper = helper->nextData;
        }
    }
    printf("\n");
    system("pause");
}

Answer 1

您绝对正确，您需要一个嵌套循环。

strtok 需要这样调用:

for (char *tok = strtok("input", " "); tok; tok = strtok(NULL, " "))
{
    /* use tok */;
}