请检查此源代码的错误并修改
```c
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct StudentInfo {
char name[50];
int id;
char sex[30];
int age;
char major[50];
int sort;
float grapoint;
};
struct Course {
char name[20];
float score;
float credit;
float DKgrapoint;
int ismakeup;//用来区分补缓考
};
typedef struct student
{
struct StudentInfo info;
struct Course courses[10];
}stu;
typedef struct Lnode
{
stu data;
struct Lnode* next;
}linklist;
void load(linklist*& L);
void showmenu(linklist*& L);
void search(linklist* L);
void add(linklist*& L);
void modify(linklist* L);
void remove(linklist* L);
void save(linklist*& L);
void initlist(linklist*& L);
void insert(linklist*& L, linklist* p);
float compute_DKgpa(float score);
float compute_gpa(linklist* newnode);
int sort_grap(linklist* p, linklist* L);
int main()
{
linklist* L;
initlist(L);
load(L);
while (1)
{
showmenu(L);
}
system("pause");
return 0;
}
void showmenu(linklist*& L)
{
int num;
printf("\n\n");
printf("————————————————————————————————————-\n");
printf("**********************学生学籍管理系统**********************\n");
printf("***********************系统功能菜单***************************\n");
printf("* 1.查询学生信息 *\n");
printf("* 2.添加学生信息 *\n");
printf("* 3.修改学生信息 *\n");
printf("* 4.删除学生信息 *\n");
printf("* 5.保存信息到文件中 *\n");
printf("* 7.退出系统 *\n");
printf("—————————————————————————————————————\n");
printf("请选择菜单的编号:");
scanf_s("%d", &num);//输入各个功能对应的序号以此来实现相应的功能
switch (num) {
case 1:search(L);
break;
case 2:add(L);
break;
case 3:modify(L);
break;
case 4:remove(L);
break;
case 5:save(L);
break;
case 6:printf("退出程序成功!\n");
exit(0);
default:
printf("请在1-6之间选择\n");
system("pause");//提示完成之后显示按任意键继续
}
}
void initlist(linklist*& L)
{
L = (linklist*)malloc(sizeof(linklist));
L->next = NULL;
}
void insert(linklist*& L, linklist* p)//尾插法插入节点
{
linklist* q;
q = L;
while (q->next)
{
q = q->next;
}
p->next = NULL;
q->next = p;
}
void add(linklist*& L)
{
linklist* p;
p = L;
int num;
printf("请输入该名学生的学号:");
scanf_s("%d", &num);
while (p->next)
{
if (p->data.info.id == num)
{
printf("该学生已存在\n");
break;
}
p = p->next;
}
if (!p->next)
{
linklist* newnode = (linklist*)malloc(sizeof(linklist));
newnode->data.info.id = num;
printf("请输入学生名字：");
scanf_s("%s", newnode->data.info.name, _countof(newnode->data.info.name));
printf("性别：");
scanf_s("%s", newnode->data.info.sex, _countof(newnode->data.info.sex));
printf("年龄：");
scanf_s("%d", &newnode->data.info.age);
printf("专业：");
scanf_s("%s", &newnode->data.info.major, _countof(newnode->data.info.major));
for (int i = 0; i < 10; i++)
{
printf("请输入第%d学科的相关信息:", i + 1);
printf("请输入该科的名称:");
scanf_s("%s", newnode->data.courses[i].name, _countof(newnode->data.courses[i].name));
printf("请输入该门课的考试状态，0代表正常考试，1代表补缓考:");
scanf_s("%d", &newnode->data.courses[i].ismakeup);
printf("请输入该门课的考试成绩:");
scanf_s("%f", &newnode->data.courses[i].score);
printf("请输入该门课程的学分:");
scanf_s("%f", &newnode->data.courses[i].credit);
if (newnode->data.courses[i].ismakeup && newnode->data.courses[i].score >= 60)
newnode->data.courses[i].score = 60;
if (newnode->data.courses[i].ismakeup && newnode->data.courses[i].score < 60)
newnode->data.courses[i].score = 0;
newnode->data.courses[i].DKgrapoint = compute_DKgpa(newnode->data.courses[i].score);//单科成绩转为绩点
}
newnode->data.info.grapoint = compute_gpa(newnode);
newnode->data.info.sort = sort_grap(newnode, L);
insert(L, newnode);
printf("添加学生成功，别忘了保存学生信息!");
}
}
float compute_DKgpa(float score)
{
return((score / 10) - 5 + ((int)score % 10) * 0.1);
}
float compute_gpa(linklist* newnode)
{
double sum1 = 0;
double sum2 = 0;
for (int i = 0; i < 10; i++)
{
sum1 = sum1 + newnode->data.courses[i].credit;//计算学分总和
sum2 = sum2 + newnode->data.courses[i].credit * newnode->data.courses[i].DKgrapoint;
}
return sum2 / sum1;
}
int sort_grap(linklist* p, linklist* L)
{
int count1 = 0;
int count2 = 0;
linklist* q = L;
while (q)
{
if (p->data.info.grapoint > (q->data.info.grapoint))
count1++;
q = q->next;
count2++;
}
return count2 - count1 + 1;
}
void modify(linklist* L)
{
int num;
int flag;
int choice;
linklist* p;
p = L;
printf("请输入您要修改的学生的学号：\n");
scanf_s("%d", &num);
while (p->next)
{
if (p->data.info.id == num)
{
flag = 1;
printf("请输入您要修改的信息选项：0.学号 1.姓名 2.性别 3.年龄 4.专业 5.各学科6.绩点 7.绩点排名 \n");
scanf_s("%d", &choice);
switch (choice)
{
case 0:
printf("请输入您要修改的学号：");
scanf_s("%d", &num);
printf("修改的学号为：%d\n", num);
p->data.info.id = num;
printf("修改学号成功！\n");
break;
case 1:
char name[50];
printf("修改后的名字为:\n");
scanf_s("%s", name, 50);
strcpy_s(p->data.info.name, name);
break;
case 2:
char sex[50];
printf("请输入您要修改的性别");
scanf_s("%s", sex, 50);
strcpy_s(p->data.info.sex, sex);
printf("修改性别成功！\n");
break;
case 3:
int age;
printf("请输入您要修改的年龄：");
scanf_s("%d", &age);
p->data.info.age = age;
printf("修改年龄成功！\n");
break;
case 4:
char major[50];
printf("请输入您要修改的专业：");
scanf_s("%s", major, 50);
strcpy_s(p->data.info.major, major);
printf("修改专业成功！");
break;
case 5:
char course[50];
printf("请输入你想修改的课程:\n");
scanf_s("%s", course, 50);
for (int i = 0; i < 10; i++)
{
if (course == p->data.info.major)
{
printf("请输入你想要修改的课程信息的相关选项:0表示课程名1表示学分2表示补缓考状态3表示成绩（包含单科绩点）\n");
int num2;
scanf_s("%d", &num2);
switch (num2)
{
case 0:
char name2[50];
printf("请输入你要重新修改的课程名:");
scanf_s("%s", name2, _countof(name2));
strcpy_s(p->data.courses[i].name, name2);
break;
case 1:
float credit;
printf("请输入你想修改的学分为:\n");
scanf_s("%f", &credit);
p->data.courses[i].credit = credit;
break;
case 2:
int ismakeup;
printf("请输入该门课程的补缓考状态,0表示正常，1表示补缓考:\n");
scanf_s("%d", &ismakeup);
p->data.courses[i].ismakeup = ismakeup;
break;
case 3:
float score;
printf("请重新输入该门课程的成绩:\n");
scanf_s("%f", &score);
p->data.courses[i].score = score;
p->data.courses[i].DKgrapoint = compute_DKgpa(score);
printf("该门课程的绩点已经自动修改!");
break;
default:
printf("输入错误，请重新进行修改:\n");
break;
}
}
}
break;
case 6:p->data.info.grapoint = compute_gpa(p);
printf("该名学生的绩点已经修改成功:\n");
break;
case 7:
printf("请修改该名学生的绩点排名:\n");
p->data.info.sort = sort_grap(p, L);
printf("修改绩点排名成功:\n");
break;
default:printf("请输入正确的选项:\n");
break;
}
}
p = p->next;
}
if (flag != 0)
printf("该学生不存在:\n");
}
void remove(linklist* L)
{
int num;
int flag;
printf("请输入您要删除的学生的学号：");
scanf_s("%d", &num);
linklist* pre = L;
linklist* p = pre->next;
while (p)
{
if (p->data.info.id == num)
{
flag = 1;
pre->next = p->next;
free(p);
printf("成功删除学生！\n");
break;
}
pre = p;
p = p->next;
}
if (flag != 0)
printf("这个学生不存在!\n");
}
void search(linklist* L)
{
int num;
int flag;
printf("1.按学号查询：\n");
printf("2.按姓名查询：\n");
printf("请输入查询方式：");
scanf_s("%d", &flag);
if (flag == 1)
{
printf("请输入该学生的学号：");
scanf_s("%d", &num);
linklist* p = L->next;
while (p != NULL)
{
if (p->data.info.id == num)
{
printf("学号：%d\n", p->data.info.id);
printf("姓名：%s\n", p->data.info.name);
printf("性别：%s\n", p->data.info.sex);
printf("年龄：%d\n", p->data.info.age);
printf("绩点：%f\n", p->data.info.grapoint);
printf("绩点排名：%d\n", p->data.info.sort);
printf("专业：%s\n", p->data.info.major);
for (int i = 0; i < 10; i++)
printf("%s: %f 绩点:%f\n", p->data.courses[i].name, p->data.courses[i].score, p->data.courses[i].DKgrapoint);
break;
}
p = p->next;
}
if (p == NULL)
printf("该学生不存在\n");
}
else
{
char name[60];
printf("请输入该学生的姓名：");
scanf_s("%s", name, 60);
linklist* q = L->next;
while (q)
{
if (strcmp(q->data.info.name,name)== 0)
{
printf("学号：%d\n", q->data.info.id);
printf("姓名：%s\n", q->data.info.name);
printf("性别：%s\n", q->data.info.sex);
printf("年龄：%d\n", q->data.info.age);
printf("绩点：%f\n", q->data.info.grapoint);
printf("绩点排名：%d\n", q->data.info.sort);
printf("专业：%s\n", q->data.info.major);
for (int i = 0; i < 10; i++)
printf("%s: %f 绩点:%f\n", q->data.courses[i].name, q->data.courses[i].score, q->data.courses[i].DKgrapoint);
break;
}
q = q->next;
}
if (!q)
printf("该学生不存在\n");
}
}
void save(linklist*& L)
{
FILE* fp;
linklist* p = L->next;
if ((fp = fopen("student.txt", "w")) == NULL)
{
printf("不能打开此文件，请按任意键退出\n");
exit(1); //异常退出
}
while (p)
{
struct Course {
char name[20];
double score;
double credit;
double DKgrapoint;
int ismakeup;//用来区分补缓考
};
fprintf(fp, "%d %s %s %d %f %d %s\n", p->data.info.id, p->data.info.name, p->data.info.sex, p->data.info.age, p->data.info.grapoint, p->data.info.sort, p->data.info.major);
for (int i = 0; i < 10; i++)
fprintf(fp, "%s %f %f %f %d\n", p->data.courses[i].name, p->data.courses[i].score, p->data.courses[i].credit, p->data.courses[i].DKgrapoint, p->data.courses[i].ismakeup);
p = p->next;
}
printf("保存成功:\n");
fclose(fp);
}
void load(linklist*& L) {
FILE* fp;
if ((fp = fopen("student.txt", "r")) == NULL) {
printf("File open failed, will create a new empty linked list.\n");
return;
}
int id;
char name[50];
char sex[30];
int age;
float grapoint;
int sort;
char major[50];
while (fscanf(fp, "%d %s %s %d %f %d %s", &id, name, sex, &age, &grapoint, &sort, major) != EOF) {
linklist* newnode = (linklist*)malloc(sizeof(linklist));
newnode->data.info.id = id;
strcpy(newnode->data.info.name, name);
strcpy(newnode->data.info.sex, sex);
newnode->data.info.age = age;
newnode->data.info.grapoint = grapoint;
newnode->data.info.sort=sort;
strcpy(newnode->data.info.major, major);
for (int i = 0; i < 10; i++) {
fscanf(fp, "%s %f %f %f %f %d", newnode->data.courses[i].name, &newnode->data.courses[i].score, &newnode->data.courses[i].credit, &newnode->data.courses[i].DKgrapoint, &newnode->data.courses[i].ismakeup);
}
insert(L, newnode);
}
fclose(fp);
}
```
