一个c语言函数怎么实现给人以类型的数据排序?
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.
c语言
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------解决方案--------------------
用qsort函数:
QSORT(3) Linux Programmer's Manual QSORT(3)
NAME
qsort - sorts an array
SYNOPSIS
#include
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.