C语言快速排序函数用法(qsort)

本文实例为大家分享了C语言快排函数用法,供大家参考,具体内容如下

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

struct student

{

int id;

char name[12];

char sex;

};

int compare(const void* a,const void* b)//基本数据类型排序

{

return *(char*)a-*(char*)b;//从小到大

//取值//强转为相应类型的指针!!

}

int compare_struct(const void* a,const void* b)

{

return (*(struct student*)a).id-((struct student*)b)->id;

//注意优先级诶!//否则报错在非结构体中。。。

}

int compare_struct_duoji(const void* a,const void* b)//多级排序

{

struct student student_a=*(struct student*)a;

struct student student_b=*(struct student*)b;

if(student_a.id==student_b.id)

{

return student_a.sex-student_b.sex;

}

else

{

return student_a.id-student_b.id;

}

}

void main()

{

//*************char型*************

char a[5]="hello";

qsort(a,5,sizeof(a[0]),compare);

//元素个数//元素大小//函数指针

int i;

for(i=0;i<5;i++)

printf("%c ",a[i]);

printf("\n");

//************struct型************

struct student e[4]={{100,"chen",'m'},{100,"li",'f'}, \

{70,"wang",'f'},{100,"zhang",'m'}};

qsort(e,4,sizeof(e[1]),compare_struct_duoji);

for(i=0;i<4;i++)

printf("%d %s %c\n",e[i].id,e[i].name,e[i].sex);

}

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