设计一个学生成绩管理系统，实现对学生成绩的动态管理，实现对学生成绩的输入，显示，删除，查找，插入，最佳，保存，计算，排序等主要功能。

功能要求

1、每一条记录包括一个学生的学号、姓名、3门课成绩、平均成绩。
2、输入功能：可以一次完成若干条记录的输入。
3、显示功能：完成全部学生记录的显示。
4、查找功能：完成按姓名查找学生记录，并显示。
5、排序功能：按学生平均成绩进行排序。
6、插入功能：按平均成绩高低插入一条学生记录
7、删除功能：如果输入错误，可以删除学生记录；
8、退出。

代码：

#include<stdio.h>#include<stdlib.h>#include<string.h>#define SIZE_NAME 10#define SIZE_ID 20int Record = 0;typedef struct { char name[SIZE_NAME]; char id[SIZE_ID]; int a, b, c; int ava;}pInfo;typedef struct node { pInfo people; struct node *next;}linkList;int menu();int create(linkList *head);int display(linkList *head);int search(linkList *head, char *info);int modify(linkList *head, char *pid);int add2(linkList *head, char *pid);int delt(linkList *head, char *info);int compare(int ava1, int ava2);int sort(linkList *head, int boolean);//1升序 0降序 int main(){ linkList head, *p; char info[SIZE_ID]; int temp, chus, i; head.next = NULL; while (1) { switch (menu()) { case 1: create(&head); break; case 2: display(&head); break; case 3: printf("请输入需要查询的学号或姓名: "); scanf("%s", info); p = &head; p = p->next; for (i = 0; i < search(&head, info); i++) { p = p->next; } printf("搜索到:\n"); printf("\t\t\t\t学生信息\n"); printf("--------------------------------------------------------------------------------\n"); printf("\t\t学号\t\t姓名\t\t\t平均成绩\n"); printf("--------------------------------------------------------------------------------\n"); printf("%20s\t", p->people.id); printf("%10s\t", p->people.name); printf("%20d\n", p->people.ava); break; case 4: printf("请输入需要修改的学号: "); scanf("%s", info); modify(&head, info); break; case 5: printf("请输入需要添加的学号: "); scanf("%s", info); add2(&head, info); break; case 6: printf("请输入需要删除的学号或姓名: "); scanf("%s", info); delt(&head, info); break; case 7: printf("请输入1或0:\n\t1:升序\n\t0:降序\n"); scanf("%d", &temp); sort(&head, temp); break; case 8: exit(0); break; default: printf("输错了，再来一次\n"); } system("pause"); system("cls"); } system("pause"); return 0;}int menu(){ int chus; printf("\t学生信息\n\n"); printf("请输入(1 -- 8):\n"); printf("\t1.创建学生信息\n"); printf("\t2.显示学生信息\n"); printf("\t3.查询学生信息\n"); printf("\t4.修改学生信息\n"); printf("\t5.添加学生信息\n"); printf("\t6.删除学生信息\n"); printf("\t7.排序学生成绩\n"); printf("\t8.退出\n"); scanf("%d", &chus); return chus;}int create(linkList *head){ linkList *s, *p; p = head; printf("请输入学号 姓名 三科成绩,输入end结束\n"); while (1) { s = (linkList*)malloc(sizeof(linkList)); scanf("%s", s->people.id); if (!strcmp(s->people.id, "end")) { return 0; } scanf("%s", s->people.name); scanf("%d", &s->people.a); scanf("%d", &s->people.b); scanf("%d", &s->people.c); s->people.ava = (s->people.a + s->people.b + s->people.c) / 3; s->next = p->next; p->next = s; p = s; Record++; } return 0;}int display(linkList *head){ int i; linkList *p; p = head; p = p->next; printf("\t\t\t\t学生信息\n"); printf("--------------------------------------------------------------------------------\n"); printf("\t\t学号\t\t姓名\t\t\t平均成绩\n"); printf("--------------------------------------------------------------------------------\n"); for (i = 0; i < Record; i++, p = p->next) { printf("%20s\t", p->people.id); printf("%10s\t", p->people.name); printf("%20d\n", p->people.ava); } return 0;}int search(linkList *head, char *info){ int i; linkList *p; p = head; p = p->next; for (i = 0; i < Record; i++, p = p->next) { if ((!strcmp(p->people.id, info)) || (!strcmp(info, p->people.name))) { return i; } } return -1;}int modify(linkList *head, char *pid){ int i; linkList *p; p = head; p = p->next; for (i = 0; i < search(head, pid); i++) { p = p->next; } printf("请输入新信息:\n"); scanf("%s", p->people.id); scanf("%s", p->people.name); scanf("%d", &p->people.a); scanf("%d", &p->people.b); scanf("%d", &p->people.c); p->people.ava = (p->people.a + p->people.b + p->people.c) / 3; return 0;}int add2(linkList *head, char *pid){ int i; linkList *p, *s; p = head; p = p->next; s = (linkList*)malloc(sizeof(linkList)); while (p->next != NULL) { p = p->next; } printf("请输入需要添加的姓名和成绩:\n"); strcpy(s->people.id, pid); scanf("%s", s->people.name); scanf("%d", &s->people.a); scanf("%d", &s->people.b); scanf("%d", &s->people.c); s->people.ava = (s->people.a + s->people.b + s->people.c) / 3; if (search(head, s->people.id) == -1) { s->next = p->next; p->next = s; Record++; } else { printf("学号重复了\n"); } sort(head, 0); return 0;}int delt(linkList *head, char *info){ int i, n; linkList *p, *s; p = head; n = search(head, info); if (-1 == n) { printf("没有找到\n"); return 0; } for (i = 0; i < n; i++) { p = p->next; } p->next = p->next->next; Record--; return 0;}int compare(int ava1, int ava2){ if (ava1 < ava2) { return 1; } return 0;}int sort(linkList *head, int boolean){ linkList *p, *pre; pInfo temp; if (boolean) { for (p = head->next; p != NULL; p = p->next) { for (pre = p->next; pre != NULL; pre = pre->next) { if (0 == compare(p->people.ava, pre->people.ava)) { temp = p->people; p->people = pre->people; pre->people = temp; } } } } else { for (p = head->next; p != NULL; p = p->next) { for (pre = p->next; pre != NULL; pre = pre->next) { if (1 == compare(p->people.ava, pre->people.ava)) { temp = p->people; p->people = pre->people; pre->people = temp; } } } } return 0;}

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