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("tttt学生信息n");
printf("--------------------------------------------------------------------------------n");
printf("tt学号tt姓名ttt平均成绩n");
printf("--------------------------------------------------------------------------------n");
printf("%20st", p->people.id);
printf("%10st", p->people.name);
printf("%20dn", 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:nt1:升序nt0: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nn");
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("tttt学生信息n");
printf("--------------------------------------------------------------------------------n");
printf("tt学号tt姓名ttt平均成绩n");
printf("--------------------------------------------------------------------------------n");
for (i = 0;
i < Record;
i++, p = p->next) {
printf("%20st", p->people.id);
printf("%10st", p->people.name);
printf("%20dn", 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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