C：在文件中查找重复的字符串值

So I have a file containing lets say:

所以我有一个文件包含让我们说：

cat
dog
cat

I am trying to go through the file, have it recognize there are two cat elements and one dog element, and then have in the same file edited as:

我正在尝试浏览文件，让它识别出有两个cat元素和一个dog元素，然后在同一个文件中编辑为：

cat - 2
dog - 1

I already have all the words saved in an array of strings, char **wordList, and I am trying to sort them with qsort and then put it in the format as described above. My qsort functions are:

我已经将所有单词保存在一个字符串数组中，char ** wordList，我试图用qsort对它们进行排序，然后将其放入如上所述的格式中。我的qsort功能是：

stringcmp(const void *a, const void *b)
 {
     const char **ia = (const char **)a;
     const char **ib = (const char **)b;
     return strcmp(*ia, *ib);
 }

 void wordSort(char **wordlist)
 {
     size_t strings_len = numwords - 1;
     qsort(wordlist, strings_len, sizeof(char*), stringcmp);
     wordFile(wordlist);
 }

void wordFile(char **wordlist)
 {
     if((outFilePtr2 = fopen(outWords, "w")) != NULL)
     {
         for(x = 1; x < numwords; x++)
         {
             fputs(wordlist[x], outFilePtr2);
             fputs("\n", outFilePtr2);
         }
         fclose(outFilePtr2);
     }
     else
     {
         printf("File\"%s\" could not be opened.\n", outWords);
     }
 }

It is not sorting anything in order though. How do I fix it?

虽然它没有按顺序排序。我如何解决它？

1 个解决方案

#1

The following program works with your definition of stringcmp (which seems correct):

以下程序适用于您对stringcmp的定义（看起来是正确的）：

int main (int argc, char *argv[]) {
    int i;
    qsort(argv, argc, sizeof(char *), &stringcmp);
    for (i = 0; i != argc; i++) printf("%s\n", argv[i]);
}

Thus I suspect that you have a problem with the definition of char **wordList.

因此我怀疑你对char ** wordList的定义有问题。

UPDATE

UPDATE

This version slightly modified/completed version of your program works for me:

这个版本稍微修改/完成的程序版本适合我：

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

char *outWords = "outWords.txt";
char *wordList[] = { "cat", "dog", "cat" };
#define numwords (sizeof(wordList) / sizeof(wordList[0]))
FILE *outFilePtr2;
int x;

int stringcmp(const void *a, const void *b)
 {
     const char **ia = (const char **)a;
     const char **ib = (const char **)b;
     return strcmp(*ia, *ib);
 }       

 void wordSort(char **wordlist)
 {       
     qsort(wordlist, numwords, sizeof(char*), stringcmp);
     wordFile(wordlist);
 }   

void wordFile(char **wordlist)
 {   
     if((outFilePtr2 = fopen(outWords, "w")) != NULL)
     {
         for(x = 0; x < numwords; x++)
         { 
             fputs(wordlist[x], outFilePtr2);
             fputs("\n", outFilePtr2);
         }
         fclose(outFilePtr2);
     }
     else
     {
         printf("File\"%s\" could not be opened.\n", outWords);
     }
 }

int main() {
    wordSort(wordList);
    wordFile(wordList); 
    return 0;
}

I adapted the second argument of qsort (else the last string pointer would not be considered, and left unchanged). I also adapted the initialization x=0 of the for-loop in wordFile for the first string to be printed, too.

我改编了qsort的第二个参数（否则最后一个字符串指针将不被考虑，并保持不变）。我还在wordFile中修改了for循环的初始化x = 0，以便打印第一个字符串。

You may have defined **wordList in some other way causing a problem, you did not provide the code for it.

您可能以某种其他方式定义了** wordList导致问题，您没有为它提供代码。

#1