c语言源代码具体要求： ①输入学生信息：输入学生的学号、姓名、班级②查找学生信息：能按学号和姓名分别查找学生的完整记录信息。 ③修改学生信息：能修改学生各项信息。 ④删除学生信息 ⑤插入学生信息

明白了，您想了解如何用 C 语言编写一个简单的学生信息管理系统，实现以上功能。以下是一个简单的示例代码，仅供参考：

#include <stdio.h>
#include <string.h>

#define MAX_STUDENT_NUM 100

struct Student {
    char id[20];
    char name[20];
    char class[20];
};

struct Student students[MAX_STUDENT_NUM];
int student_count = 0;

void add_student() {
    if (student_count >= MAX_STUDENT_NUM) {
        printf("Error: Student database is full.\n");
        return;
    }
    struct Student s;
    printf("Enter student ID: ");
    scanf("%s", s.id);
    printf("Enter student name: ");
    scanf("%s", s.name);
    printf("Enter student class: ");
    scanf("%s", s.class);
    students[student_count++] = s;
    printf("Student added successfully.\n");
}

void search_student_by_id() {
    char id[20];
    printf("Enter student ID to search: ");
    scanf("%s", id);
    int found = 0;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("Student found:\nID: %s\nName: %s\nClass: %s\n", students[i].id, students[i].name, students[i].class);
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("Error: Student not found.\n");
    }
}

void search_student_by_name() {
    char name[20];
    printf("Enter student name to search: ");
    scanf("%s", name);
    int found = 0;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].name, name) == 0) {
            printf("Student found:\nID: %s\nName: %s\nClass: %s\n", students[i].id, students[i].name, students[i].class);
            found = 1;
        }
    }
    if (!found) {
        printf("Error: Student not found.\n");
    }
}

void update_student() {
    char id[20];
    printf("Enter student ID to update: ");
    scanf("%s", id);
    int found = 0;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("Enter new student name (or press enter to skip): ");
            char name[20];
            scanf("%s", name);
            if (strlen(name) > 0) {
                strcpy(students[i].name, name);
            }
            printf("Enter new student class (or press enter to skip): ");
            char class[20];
            scanf("%s", class);
            if (strlen(class) > 0) {
                strcpy(students[i].class, class);
            }
            printf("Student updated successfully.\n");
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("Error: Student not found.\n");
    }
}

void delete_student() {
    char id[20];
    printf("Enter student ID to delete: ");
    scanf("%s", id);
    int found = 0;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].id, id) == 0) {
            for (int j = i; j < student_count - 1; j++) {
                students[j] = students[j + 1];
            }
            student_count--;
            printf("Student deleted successfully.\n");
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("Error: Student not found.\n");
    }
}

int main() {
    while (1) {
        printf("\n");
        printf("1. Add student\n");
        printf("2. Search student by ID\n");
        printf("3. Search student by name\n");
        printf("4. Update student\n");
        printf("5. Delete student\n");
        printf("6. Exit\n");
        printf("Enter your choice: ");
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                search_student_by_id();
                break;
            case 3:
                search_student_by_name();
                break;
            case 4:
                update_student();
                break;
            case 5:
                delete_student();
                break;
            case 6:
                return 0;
            default:
                printf("Error: Invalid choice.\n");
        }
    }
}

这个示例代码定义了一个 `Student` 结构体，包含学生的 ID、姓名和班级。使用一个 `students` 数组来存储所有学生的信息。程序提供了以下功能：

1. 添加学生：输入学生的 ID、姓名和班级，将其添加到 `students` 数组中；
2. 按 ID 查找学生：输入学生的 ID，查找并输出该学生的完整信息；
3. 按姓名查找学生：输入学生的姓名，查找并输出所有与该姓名匹配的学生的完整信息；
4. 修改学生信息：输入要修改的学生的 ID，然后可以选择更新该学生的姓名和/或班级；
5. 删除学生信息：输入要删除的学生的 ID，将其从 `students` 数组中删除；
6. 退出程序。

请注意，这只是一个简单的示例，实际使用时应该根据具体需求进行适当的修改和扩展。