c - 在 C 编程语言中按字母顺序对数组进行排序？

Question

我想按字母顺序对数组进行排序，如下所示:

各种方法都试过了，还是不行。它崩溃了，还不知道为什么。您有一些技巧可以帮助您解决这个问题吗？

由于我不是专家，所以代码旨在简单(阅读/理解)和完成工作。

谢谢，问候

/* note: datalist[...] is basically the ouput from a sort of ls (dir
read) that it unsorted. So that: datalist[0] is ".." datalist[1] is
"file2.c" datalist[2] is "file34.c" and so on.*/


    char datalist[500][2024] ; 


void sortData(int aoptiondt)  {   ///////////////////////////LOCAL
DECLARATIONS/////////   int MAX = 500 ;    int current; int walker;  
int smallestIndex;   char* temp;

  ///////////////////////////DEFINITIONS//////////////////



    for (current = 0; current < MAX - 1; current++)
    {
      smallestIndex = current;
      for (walker = current; walker < MAX ; walker ++)
      {
        if (strcmp(datalist[walker], datalist[smallestIndex]) < 0)
          smallestIndex = walker;
      } //for walker

      //Swap to position smallest at what is the current position
      strncpy( temp , datalist[current] , PATH_MAX);
      strncpy( datalist[current] , datalist[smallestIndex] , PATH_MAX);
      strncpy( datalist[smallestIndex] , temp, PATH_MAX);
    } //for current    }

  return; }


//blabla
    int  main() {



    }

Answer 1

一如既往 - qsort 是您最好的 friend :

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

#define LENGTH 6
#define STRING_SIZE 4
#define STRINGS "eed", "abd", "cde", "abc", "acd", "ade"

char strUnsorted[][STRING_SIZE] = {STRINGS};
char strSorted[][STRING_SIZE]   = {STRINGS};

int compare (const void * a, const void * b) {
  return strcmp(a, b);
}

int main () {

  qsort(strSorted, LENGTH, STRING_SIZE, compare);

  printf("Unsorted | Sorted\n");
  printf("-----------------\n");

  int i;
  for (i=0; i < LENGTH; i++)
    printf ("  %s    |   %s\n", strUnsorted[i] ,strSorted[i]);

  return 0;
}