#include <stdio.h> #include <string.h> #define MAX_STUDENT_NUM 30 //最大学生个数 #define MAX_COURSE_NUM 6 //最大课程个数 #define NAME_LEN 20 //最大名字个数 typedef struct Student { char id[10];//学生学号 char name[NAME_LEN];//姓名 int scores[MAX_COURSE_NUM];//各科分数 int total_score;//总分 float avg_score;//平均分 } XUESHENG;//将结构体名称命名为XUESHENG void sort_by_total_score(XUESHENG students[], int num);//按每个学生的总分由高到低排出名次表 void sort_by_number(XUESHENG students[], int num);//按学号由小到大排出成绩表 void sort_by_name(XUESHENG students[], int num);//按姓名的字典顺序排出成绩表 请补充各个函数

函数1：按每个学生的总分由高到低排出名次表

void sort_by_total_score(XUESHENG students[], int num){
    int i, j;
    XUESHENG temp;
    for(i = 0; i < num - 1; i++){
        for(j = i + 1; j < num; j++){
            if(students[i].total_score < students[j].total_score){
                temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

函数2：按学号由小到大排出成绩表

void sort_by_number(XUESHENG students[], int num){
    int i, j;
    XUESHENG temp;
    for(i = 0; i < num - 1; i++){
        for(j = i + 1; j < num; j++){
            if(strcmp(students[i].id, students[j].id) > 0){
                temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

函数3：按姓名的字典顺序排出成绩表

void sort_by_name(XUESHENG students[], int num){
    int i, j;
    XUESHENG temp;
    for(i = 0; i < num - 1; i++){
        for(j = i + 1; j < num; j++){
            if(strcmp(students[i].name, students[j].name) > 0){
                temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}