C语言回调函数实例

今天刚学习了C语言回调函数，现炒现卖，写一个实例供参考
在主函数调用SearchStudents函数的时候给它传递了SearchByNumber这个函数，而SearchStudents函数内部又返回调用了SearchByNumber，故为回调

#include<stdio.h>#include<stdlib.h>#definenull((void*)0)//定义一个学生结构体typedef struct{char *Name;long Number;unsigned char ChinesSocre;unsigned char MathSocre;unsigned char EnglishSocre;long sumSocre;float averageSocre;} STU,*PSTU;//定义回调函数指针typedef int (*SearchFunCallBack)(void const *, void const *);//查找学生并计算总成绩和平均成绩。PSTU SearchStudents(PSTU pStuList,SearchFunCallBack searchFun,void const * searchValue){while(pStuList->Name != null){if(searchFun(pStuList,searchValue) == 1){pStuList->sumSocre=pStuList->ChinesSocre+pStuList->MathSocre+pStuList->EnglishSocre;pStuList->averageSocre=pStuList->sumSocre/3.0f;break;}pStuList++;}return pStuList;}//通过学号查找学生int SearchByNumber(void const * ListNode,void const * value){PSTU pStu;pStu = (PSTU)ListNode;if(pStu->Number == *(long *)value){return 1;}else{return 0;}}//通过姓名查找学生int SearchByName(void const * ListNode,void const * value){PSTU pStu;pStu = (PSTU)ListNode;if(pStu->Name == (char *)value){return 1;}else{return 0;}}void main(){PSTU pStu;STU students[3];students[0].Name="小张";students[0].Number=1001;students[0].ChinesSocre=78;students[0].MathSocre=86;students[0].EnglishSocre=85;students[1].Name="小明";students[1].Number=1002;students[1].ChinesSocre=96;students[1].MathSocre=67;students[1].EnglishSocre=90;students[2].Name="小李";students[2].Number=1003;students[2].ChinesSocre=87;students[2].MathSocre=75;students[2].EnglishSocre=95;while(1){long value = 1003;//pStu = SearchStudents(students,SearchByNumber,&value);// 通过学号查找pStu = SearchStudents(students,SearchByName,"小明");// 通过姓名查找if(pStu->Name == null){printf("没有找到该学生。\n");}else{printf("查找到相应的学生：\n姓    名：%s\n学    号：%d\n语文成绩：%d\n数学成绩：%d\n英语成绩：%d\n总 成 绩：%d\n平均成绩：%.2f",pStu->Name,pStu->Number,pStu->ChinesSocre,pStu->MathSocre,pStu->EnglishSocre,pStu->sumSocre,pStu->averageSocre);}while(1);}}