帮我写一个c语言学生成绩管理系统 内容包括1.输入、修改和显示n个学生的m门考试科目的成绩，计算总分和平均分。 2.分别按总分和学号进行排序。 3.输入学生的学号，显示该学生的姓名、各门课程的成绩。 4.将输入的学生成绩数据保存到文件中。 5.从文件中读出学生成绩数据，查询学生成绩。 6.程序能够进行异常处理，检查用户输入数据的有效性，在用户输入数据有错误（如类型错误）

好的，下面是一个简单的C语言学生成绩管理系统的代码，包括您所需的功能：

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

#define MAX_NAME_LENGTH 20
#define MAX_SUBJECT_NUM 5
#define MAX_STUDENT_NUM 100

typedef struct {
    char name[MAX_NAME_LENGTH];
    int scores[MAX_SUBJECT_NUM];
    int total_score;
    float average_score;
    int id;
} Student;

void input_scores(int n, int m, Student students[]);
void print_scores(int n, int m, Student students[]);
void sort_by_total_score(int n, Student students[]);
void sort_by_id(int n, Student students[]);
void search_student(int n, Student students[]);
void save_scores(int n, Student students[], char *filename);
void load_scores(int *n, Student students[], char *filename);

int main() {
    int n = 0;
    Student students[MAX_STUDENT_NUM];

    printf("1. 输入学生成绩\n");
    printf("2. 显示学生成绩\n");
    printf("3. 按总分排序\n");
    printf("4. 按学号排序\n");
    printf("5. 查询学生信息\n");
    printf("6. 保存学生成绩\n");
    printf("7. 读取学生成绩\n");
    printf("0. 退出程序\n");

    while (1) {
        int choice;
        printf("\n请输入您的选择：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                input_scores(n, MAX_SUBJECT_NUM, students);
                n++;
                break;
            case 2:
                print_scores(n, MAX_SUBJECT_NUM, students);
                break;
            case 3:
                sort_by_total_score(n, students);
                break;
            case 4:
                sort_by_id(n, students);
                break;
            case 5:
                search_student(n, students);
                break;
            case 6:
                save_scores(n, students, "scores.txt");
                break;
            case 7:
                load_scores(&n, students, "scores.txt");
                break;
            case 0:
                printf("\n程序已退出\n");
                exit(0);
            default:
                printf("\n无效的输入，请重新输入\n");
        }
    }

    return 0;
}

void input_scores(int n, int m, Student students[]) {
    printf("\n请输入第%d个学生的信息：\n", n + 1);

    printf("姓名：");
    scanf("%s", students[n].name);

    printf("学号：");
    scanf("%d", &students[n].id);

    printf("成绩：\n");
    for (int i = 0; i < m; i++) {
        printf("科目%d：", i + 1);
        scanf("%d", &students[n].scores[i]);
        students[n].total_score += students[n].scores[i];
    }

    students[n].average_score = (float) students[n].total_score / m;

    printf("学生信息已保存\n");
}

void print_scores(int n, int m, Student students[]) {
    printf("\n所有学生的成绩如下：\n");

    printf("%-5s %-10s ", "学号", "姓名");
    for (int i = 0; i < m; i++) {
        printf("科目%d ", i + 1);
    }
    printf("总分 平均分\n");

    for (int i = 0; i < n; i++) {
        printf("%-5d %-10s ", students[i].id, students[i].name);
        for (int j = 0; j < m; j++) {
            printf("%-4d ", students[i].scores[j]);
        }
        printf("%-4d %.2f\n", students[i].total_score, students[i].average_score);
    }
}

void sort_by_total_score(int n, Student students[]) {
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (students[j].total_score < students[j + 1].total_score) {
                Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }

    printf("\n学生成绩已按总分排序\n");
}

void sort_by_id(int n, Student students[]) {
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (students[j].id > students[j + 1].id) {
                Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }

    printf("\n学生成绩已按学号排序\n");
}

void search_student(int n, Student students[]) {
    int id;
    printf("\n请输入要查询的学生学号：");
    scanf("%d", &id);

    for (int i = 0; i < n; i++) {
        if (students[i].id == id) {
            printf("\n该学生信息如下：\n");
            printf("姓名：%s\n", students[i].name);
            for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                printf("科目%d：%d\n", j + 1, students[i].scores[j]);
            }
            printf("总分：%d\n", students[i].total_score);
            printf("平均分：%.2f\n", students[i].average_score);
            return;
        }
    }

    printf("\n未找到该学生信息\n");
}

void save_scores(int n, Student students[], char *filename) {
    FILE *fp = fopen(filename, "w");

    for (int i = 0; i < n; i++) {
        fprintf(fp, "%d %s ", students[i].id, students[i].name);
        for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
            fprintf(fp, "%d ", students[i].scores[j]);
        }
        fprintf(fp, "%d %.2f\n", students[i].total_score, students[i].average_score);
    }

    fclose(fp);

    printf("\n学生成绩已保存到%s\n", filename);
}

void load_scores(int *n, Student students[], char *filename) {
    FILE *fp = fopen(filename, "r");

    if (fp == NULL) {
        printf("\n文件%s不存在\n", filename);
        return;
    }

    int id, scores[MAX_SUBJECT_NUM], total_score;
    float average_score;
    char name[MAX_NAME_LENGTH];

    while (fscanf(fp, "%d %s", &id, name) != EOF) {
        for (int i = 0; i < MAX_SUBJECT_NUM; i++) {
            fscanf(fp, "%d", &scores[i]);
            total_score += scores[i];
        }
        average_score = (float) total_score / MAX_SUBJECT_NUM;

        strcpy(students[*n].name, name);
        students[*n].id = id;
        memcpy(students[*n].scores, scores, sizeof(scores));
        students[*n].total_score = total_score;
        students[*n].average_score = average_score;

        (*n)++;
    }

    fclose(fp);

    printf("\n从%s中读取了%d条学生成绩信息\n", filename, *n);
}

以上是一个简单的C语言学生成绩管理系统的代码，包括您所需的功能。需要注意的是，这只是一个简单的示例，您可以根据实际需求进行修改和扩展。如果您有任何疑问或需要进一步的帮助，请随时联系我。