创建一个字符串数组来保存长字符串中的分割标记？

Question

我已经尝试了我所知道的一切，但就是无法创建数组。每次终端都会显示“Segmentation failure: 11”。请帮忙，谢谢!(详细信息在我的评论中)

更新:char*load file(int *numberofwords)返回从txt文件读取的内容(我编出来只是为了测试我的程序如何工作):

Have,a.nice day

Bye.

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


char *loadfile(int *counter) {
    int  i;
    char chr;
    char *data;
    char *junk;
    FILE *GENE;
    GENE = fopen("hw7codex.txt", "r");

    if (GENE == NULL) {
       printf("ERROR - Could not open file.\n");
       return NULL; 
    }


   while (1) {
      fscanf(GENE, "%s", junk);
      (*counter)++;
      if (feof(GENE)) break;
   }

   int wholecounter = 0;
   while (1) {
      fscanf(GENE, "%c", &chr);
      wholecounter++;
     if (feof(GENE)) break;
   }

   data = (char *)calloc(wholecounter, sizeof(char));
      if (data == NULL) {
        printf("ERROR - Could not allocate memory for the file.\n");
        return NULL;
   }

   rewind(GENE);
   i = 0;
   while (1) {
       fscanf(GENE, "%c", &chr);
       data[i++] = chr;
       if (feof(GENE)) break;
   }
   fclose(GENE);

   return data;
}






int main(void){

int wordscount=0;

char *temp;

//temp gets a long string from a txt file(which looks like
//"Have,a.nice day"then divides it to separate words:"Have","a", "nice","day"
temp = strtok(loadfile(&wordscount)," ,.\n"); 

//I want to know how many separate words in this txt file
printf("%s\n", loadfile(&wordscount));  //it prints out 5
printf("%d\n", wordscount);       //it prints out 'Have,a.nice day\nBye'


//I want to create a string array here to hold all those words , but I keep failing
char array[wordscount][40];

int j=0;
while (temp != NULL){
    strcpy(array[j], temp);
    j++;
    temp = strtok (NULL, " ,.\n");
    }


for (j = 0; j < wordscount; j++){
   printf("%s\n", array[j]);
    }

Answer 1

char array[wordscount][40];如果您的编译器不支持 VLA，则这是非法的。您应该声明一个指向字符串的指针数组，然后手动分配内存:

char** array;
int i;
array = (char**)malloc(wordscount * sizeof(char*)); // 

for ( i = 0; i < wordscount; i++) {
    array[i] = (char*)malloc(40 * sizeof(char)); // make sure the length of every word is less than 40
}; 

编辑:
如果loadfile()返回你写的内容(不知道你如何实现 loadfile() ，你应该为函数中的字符串分配内存)和 wordscount是 5，那么这里是一个可以正常工作的示例:

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

int main(void){

    int wordscount = 5;

    char *temp;
    char buf[128] = "Have,a.nice day\nBye";

    temp = strtok(buf, " ,.\n"); 

    char** array;
    int i;
    array = (char**)malloc(wordscount * sizeof(char*)); // 

    for ( i = 0; i < wordscount; i++) {
        array[i] = (char*)malloc(40 * sizeof(char)); // make sure the length of every word is less than 40
    }; 

    int j = 0;
    while (temp != NULL){
        strcpy(array[j], temp);
        j++;
        temp = strtok (NULL, " ,.\n");
    }

    for (j = 0; j < wordscount; j++){
        printf("%s\n", array[j]);
    }
}

在您的 loadfile() 中, junk是一个未初始化的指针，所以这一行: fscanf(GENE, "%s", junk);将导致未定义的行为。