C语言实现学生成绩管理系统
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 20
int 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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