以下是一个简单的C语言程序，用于管理学生信息链表：
```c
#include
#include
#include
// 定义学生结构体
typedef struct Student {
int id;
char sex;
int age;
char class[30];
struct Student *next;
} Student;
// 函数声明
Student* createStudent();
void insertStudent(Student **head, Student *newStudent);
void deleteStudent(Student **head, int id);
void modifyStudent(Student **head, int id);
void findStudent(Student *head, int id);
void displayStudents(Student *head);
void freeStudents(Student *head);
int main() {
int choice, numStudents, id;
Student *head = NULL;
printf("学生信息管理程序\n");
while (1) {
printf("\n请选择操作:\n");
printf("1. 初始化\n");
printf("2. 插入学生\n");
printf("3. 删除学生\n");
printf("4. 修改学生信息\n");
printf("5. 查找学生信息\n");
printf("6. 显示所有学生信息\n");
printf("7. 退出\n");
printf("输入选择：");
scanf("%d", &choice);
switch (choice) {
case 1:
printf("请输入班级学生人数：");
scanf("%d", &numStudents);
for (int i = 0; i < numStudents; i++) {
Student *newStudent = createStudent();
insertStudent(&head, newStudent);
}
break;
case 2:
{
Student *newStudent = createStudent();
insertStudent(&head, newStudent);
}
break;
case 3:
printf("请输入要删除学生的学号：");
scanf("%d", &id);
deleteStudent(&head, id);
break;
case 4:
printf("请输入要修改信息学生的学号：");
scanf("%d", &id);
modifyStudent(&head, id);
break;
case 5:
printf("请输入要查找学生的学号：");
scanf("%d", &id);
findStudent(head, id);
break;
case 6:
displayStudents(head);
break;
case 7:
freeStudents(head);
printf("程序退出\n");
return 0;
default:
printf("无效的选择\n");
break;
}
}
return 0;
}
// 创建新学生并返回
Student* createStudent() {
Student *newStudent = (Student*)malloc(sizeof(Student));
if (!newStudent) {
printf("内存分配失败\n");
exit(EXIT_FAILURE);
}
printf("请输入学生学号：");
scanf("%d", &newStudent->id);
printf("请输入学生性别(M/F)：");
scanf(" %c", &newStudent->sex);
printf("请输入学生年龄：");
scanf("%d", &newStudent->age);
printf("请输入学生班级：");
scanf("%s", newStudent->class);
newStudent->next = NULL;
return newStudent;
}
// 向链表插入新学生
void insertStudent(Student **head, Student *newStudent) {
newStudent->next = *head;
*head = newStudent;
}
// 按学号删除学生
void deleteStudent(Student **head, int id) {
Student *prev = NULL, *current = *head;
while (current != NULL && current->id != id) {
prev = current;
current = current->next;
}
if (current != NULL) {
if (prev == NULL) {
*head = current->next;
} else {
prev->next = current->next;
}
free(current);
printf("学生删除成功\n");
} else {
printf("未找到指定学号的学生\n");
}
}
// 按学号修改学生信息
void modifyStudent(Student **head, int id)
