用c语言制作一个学生信息管理系统，其中包括学号，姓名，性别，年龄，生源地，成绩，系统与菜单方式与用户进行交互，系统具备打印输出所有学生信息的功能，添加学生信息，显示学生信息，修改学生信息，删除学生信息，查找学生信息，按学生总成绩进行高到低排序。

以下是用C语言制作的学生信息管理系统的代码示例：

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

#define MAX_STUDENTS 100

struct Student {
    int studentID;
    char name[50];
    char gender[10];
    int age;
    char hometown[50];
    float score;
};

struct Student students[MAX_STUDENTS];
int numStudents = 0;

void printMenu() {
    printf("\n-- 学生信息管理系统 --\n");
    printf("1. 添加学生信息\n");    printf("2. 显示所有学生信息\n");
    printf("3. 修改学生信息\n");
    printf("4. 删除学生信息\n");
    printf("5. 查找学生信息\n");
    printf("6. 按学生总成绩排序\n");
    printf("0. 退出系统\n");
    printf("--\n");
    printf("请输入选项：");
}

void addStudent() {
    if (numStudents >= MAX_STUDENTS) {
        printf("学生信息已满，无法添加新学生。\n");
        return;
    }

    struct Student newStudent;

    printf("请输入学生学号：");
    scanf("%d", &newStudent.studentID);
    printf("请输入学生姓名：");
    scanf("%s", newStudent.name);
    printf("请输入学生性别：");
    scanf("%s", newStudent.gender);
    printf("请输入学生年龄：");
    scanf("%d", &newStudent.age);
    printf("请输入学生生源地：");
    scanf("%s", newStudent.hometown);
    printf("请输入学生成绩：");
    scanf("%f", &newStudent.score);

    students[numStudents] = newStudent;
    numStudents++;

    printf("学生信息添加成功。\n");
}

void displayStudents() {
    if (numStudents == 0) {
        printf("暂无学生信息。\n");
        return;
    }

    printf("\n-- 所有学生信息 --\n");
    for (int i = 0; i < numStudents; i++) {
        printf("学号：%d\n", students[i].studentID);
        printf("姓名：%s\n", students[i].name);
        printf("性别：%s\n", students[i].gender);
        printf("年龄：%d\n", students[i].age);
        printf("生源地：%s\n", students[i].hometown);
        printf("成绩：%.2f\n", students[i].score);
        printf("--\n");
    }
}

void modifyStudent() {
    int studentID;
    printf("请输入要修改的学生学号：");
    scanf("%d", &studentID);

    int foundIndex = -1;
    for (int i = 0; i < numStudents; i++) {
        if (students[i].studentID == studentID) {
            foundIndex = i;
            break;
        }
    }

    if (foundIndex == -1) {
        printf("未找到该学生学号的信息。\n");
        return;
    }

    struct Student modifiedStudent;

    printf("请输入学生姓名：");
    scanf("%s", modifiedStudent.name);
    printf("请输入学生性别：");
    scanf("%s", modifiedStudent.gender);
    printf("请输入学生年龄：");
    scanf("%d", &modifiedStudent.age);
    printf("请输入学生生源地：");
    scanf("%s", modifiedStudent.hometown);
    printf("请输入学生成绩：");
    scanf("%f", &modifiedStudent.score);

    students[foundIndex] = modifiedStudent;

    printf("学生信息修改成功。\n");
}

void deleteStudent() {
    int studentID;
    printf("请输入要删除的学生学号：");
    scanf("%d", &studentID);

    int foundIndex = -1;
    for (int i = 0; i < numStudents; i++) {
        if (students[i].studentID == studentID) {
            foundIndex = i;
            break;
        }
    }

    if (foundIndex == -1) {
        printf("未找到该学生学号的信息。\n");
        return;
    }

    for (int i = foundIndex; i < numStudents - 1; i++) {
        students[i] = students[i + 1];
    }

    numStudents--;

    printf("学生信息删除成功。\n");
}

void searchStudent() {
    char name[50];
    printf("请输入要查找的学生姓名：");
    scanf("%s", name);

    int foundIndex = -1;
    for (int i = 0; i < numStudents; i++) {
        if (strcmp(students[i].name, name) == 0) {
            foundIndex = i;
            break;
        }
    }

    if (foundIndex == -1) {
        printf("未找到该学生姓名的信息。\n");
        return;
    }

    printf("\n-- 学生信息 --\n");
    printf("学号：%d\n", students[foundIndex].studentID);
    printf("姓名：%s\n", students[foundIndex].name);
    printf("性别：%s\n", students[foundIndex].gender);
    printf("年龄：%d\n", students[foundIndex].age);
    printf("生源地：%s\n", students[foundIndex].hometown);
    printf("成绩：%.2f\n", students[foundIndex].score);
    printf("--\n");
}

void sortByScore() {
    for (int i = 0; i < numStudents - 1; i++) {
        for (int j = 0; j < numStudents - i - 1; j++) {
            if (students[j].score < students[j + 1].score) {
                struct Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }

    printf("学生信息按总成绩从高到低排序成功。\n");
}

int main() {
    int option;

    do {
        printMenu();
        scanf("%d", &option);

        switch (option) {
            case 1:
                addStudent();
                break;
            case 2:
                displayStudents();
                break;
            case 3:
                modifyStudent();
                break;
            case 4:
                deleteStudent();
                break;
            case 5:
                searchStudent();
                break;
            case 6:
                sortByScore();
                break;
            case 0:
                printf("感谢使用学生信息管理系统，再见！\n");
                break;
            default:
                printf("无效的选项，请重新输入。\n");
                break;
        }
    } while (option != 0);

    return 0;
}