函数指针的用法-白红宇

函数指针的用法

阅读量：6536 次

发布时间：2019-06-24

本文共 2339 字，大约阅读时间需要 7 分钟。

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#include
     
      #include
      
       int compare(void *, void *, int (*)(void *, void *));int orderById(void *, void *);int orderByName(void *, void *);int orderByAge(void *, void *);struct Student {    int id;    char name[64];    int age;    char address[1024];};void arrSort(struct Student *, int, int (*)(void *, void *));int main(void){    struct Student arr[5] = {
    {        20140101,            "zhangsan",            24,            "china.guangzhou"    }, {        20140103,            "lisi",            28,            "USA.ny"    }, {        20140102,            "wangwu",            18,            "UK"        }, {            20140110,                "zhaoliu",                19,                "china.peking"        }, {            20140131,                "fwy",                27,                "china.nc"        }};    printf("\n-----------id升序-----------------\n");    arrSort(arr, 5, orderById);        printf("\n-----------name升序-----------------\n");    arrSort(arr, 5, orderByName);    printf("\n-----------age升序-----------------\n");    arrSort(arr, 5, orderByAge);}//统一比较函数int compare(void * stu, void * stu2, int (*pt)(void *, void *)){    return (*pt)(stu, stu2);}//按Id升序排列int orderById(void * stu, void * stu2){    struct Student s = *((struct Student *)stu);    struct Student s2 = *((struct Student *)stu2);    return s2.id - s.id;}//按name升序排列int orderByName(void * stu, void * stu2){    struct Student s = *((struct Student *)stu);    struct Student s2 = *((struct Student *)stu2);    return strcmp(s2.name, s.name);}//按age升序排列int orderByAge(void * stu, void * stu2){    struct Student s = *((struct Student *)stu);    struct Student s2 = *((struct Student *)stu2);    return s2.age - s.age;}//结构体数组排序void arrSort(struct Student * arr, int size, int (*pt)(void *, void *)){    int i,j;    struct Student temp;    for(i = 0; i < size -1; i++)    {        for(j = 0; j < size - 1 - i; j++)            {            if(compare(&arr[j], &arr[j + 1], pt) < 0)            {                temp = arr[j];                  arr[j] = arr[j + 1];                arr[j + 1] = temp;            }        }    }    for(i = 0; i < size; i++)    {        printf("%10d %10s %3d %15s\n", arr[i].id, arr[i].name, arr[i].age, arr[i].address);    }}

转载于:https://www.cnblogs.com/itpoorman/p/3875472.html

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