一个c语言函数怎么实现给人以类型的数据排序?

[lh_haizhiyun]

用一个c语言函数怎么实现给任意类型的数据记录排序
函数参数有4个:指向实参的指针,实参记录的总长度,实参数据类型的长度(如int 为4字节),函数指针.
其中函数指针是一个指向比较函数的指针,用于比较记录的大小,返回值有负值,0,正直,分别对应大于,等于,小于.

[图灵狗]

用qsort函数：

QSORT(3)                   Linux Programmer's Manual                  QSORT(3)



NAME
       qsort - sorts an array

SYNOPSIS
       #include <stdlib.h>

       void qsort(void *base, size_t nmemb, size_t size,
                  int(*compar)(const void *, const void *));

DESCRIPTION
       The  qsort()  function sorts an array with nmemb elements of size size.
       The base argument points to the start of the array.

       The contents of the array are sorted in ascending order according to  a
       comparison  function  pointed  to  by  compar, which is called with two
       arguments that point to the objects being compared.

       The comparison function must return an integer less than, equal to,  or
       greater  than  zero  if  the first argument is considered to be respec‐
       tively less than, equal to, or greater than the second.  If two members
       compare as equal, their order in the sorted array is undefined.

RETURN VALUE
       The qsort() function returns no value.

CONFORMING TO
       SVr4, 4.3BSD, C89, C99.

NOTES
       Library routines suitable for use as the compar argument include alpha‐
       sort(3) and versionsort(3).  To compare C strings, the comparison func‐
       tion can call strcmp(3), as shown in the example below.

EXAMPLE
       For one example of use, see the example under bsearch(3).

       Another example is the following program, which sorts the strings given
       in its command-line arguments:

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

       static int
       cmpstringp(const void *p1, const void *p2)
       {
           /* The actual arguments to this function are "pointers to
              pointers to char", but strcmp(3) arguments are "pointers
              to char", hence the following cast plus dereference */

           return strcmp(* (char * const *) p1, * (char * const *) p2);
       }

       int
       main(int argc, char *argv[])
       {
           int j;

           if (argc < 2) {
            fprintf(stderr, "Usage: %s <string>...\n", argv[0]);
            exit(EXIT_FAILURE);
           }

           qsort(&argv[1], argc - 1, sizeof(argv[1]), cmpstringp);

           for (j = 1; j < argc; j++)
               puts(argv[j]);
           exit(EXIT_SUCCESS);
       }

SEE ALSO
       sort(1), alphasort(3), strcmp(3), versionsort(3)

COLOPHON
       This page is part of release 3.24 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



                                  2009-09-15                          QSORT(3)

[qzf362269994]

楼上正解，自己写个判断函数就行了，定义怎么排序就行了 #include <stdlib.h> void qsort( void *buf, size_t num, size_t size, int (*compare)(const void *, const void *) );

[AnYidan]

call back

[socrates]

楼上都对，用回调函数，让调用者自己写比较算法。