用 c 语言在 vs2022 上写一个学生成绩管理系统要 200 行以上十个函数以上

以下是一个简单的学生成绩管理系统，包含了十个函数以上，大约有200行代码。其中包括了学生信息的输入、输出，成绩的录入、查询、修改、删除等基本功能。

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

#define MAX_STUDENT_NUM 100
#define NAME_LEN 20

typedef struct student {
    char name[NAME_LEN];
    int id;
    float score;
} Student;

int menu();
void add_student(Student *students, int *num);
void print_student(const Student *students, int num);
void search_student(const Student *students, int num);
void modify_student(Student *students, int num);
void delete_student(Student *students, int *num);
void sort_student(Student *students, int num);
void save_student(const Student *students, int num);
void load_student(Student *students, int *num);

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

    load_student(students, &num);

    do {
        choice = menu();

        switch (choice) {
            case 1:
                add_student(students, &num);
                break;
            case 2:
                print_student(students, num);
                break;
            case 3:
                search_student(students, num);
                break;
            case 4:
                modify_student(students, num);
                break;
            case 5:
                delete_student(students, &num);
                break;
            case 6:
                sort_student(students, num);
                break;
            case 7:
                save_student(students, num);
                break;
            case 0:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice, please try again!\n");
        }
    } while (choice != 0);

    return 0;
}

int menu() {
    int choice;

    printf("Student Score Management System\n");
    printf("--------------------------------\n");
    printf("1. Add student\n");
    printf("2. Print all students\n");
    printf("3. Search student\n");
    printf("4. Modify student\n");
    printf("5. Delete student\n");
    printf("6. Sort students\n");
    printf("7. Save to file\n");
    printf("0. Exit\n");
    printf("Please enter your choice: ");
    scanf("%d", &choice);

    return choice;
}

void add_student(Student *students, int *num) {
    if (*num >= MAX_STUDENT_NUM) {
        printf("Maximum number of students reached!\n");
        return;
    }

    printf("Please enter student name: ");
    scanf("%s", students[*num].name);
    printf("Please enter student ID: ");
    scanf("%d", &students[*num].id);
    printf("Please enter student score: ");
    scanf("%f", &students[*num].score);

    (*num)++;
}

void print_student(const Student *students, int num) {
    if (num == 0) {
        printf("No students found!\n");
        return;
    }

    printf("Name\tID\tScore\n");
    printf("-----------------\n");
    for (int i = 0; i < num; i++) {
        printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].score);
    }
}

void search_student(const Student *students, int num) {
    char keyword[NAME_LEN];
    printf("Please enter search keyword: ");
    scanf("%s", keyword);

    printf("Name\tID\tScore\n");
    printf("-----------------\n");
    for (int i = 0; i < num; i++) {
        if (strstr(students[i].name, keyword) != NULL) {
            printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].score);
        }
    }
}

void modify_student(Student *students, int num) {
    int id;
    printf("Please enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num; i++) {
        if (students[i].id == id) {
            printf("Please enter new score: ");
            scanf("%f", &students[i].score);
            printf("Score updated successfully!\n");
            return;
        }
    }

    printf("Student not found!\n");
}

void delete_student(Student *students, int *num) {
    int id;
    int index = -1;
    printf("Please enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < *num; i++) {
        if (students[i].id == id) {
            index = i;
            break;
        }
    }

    if (index == -1) {
        printf("Student not found!\n");
        return;
    }

    for (int i = index; i < *num - 1; i++) {
        students[i] = students[i + 1];
    }

    (*num)--;
    printf("Student deleted successfully!\n");
}

void sort_student(Student *students, int num) {
    for (int i = 0; i < num - 1; i++) {
        for (int j = i + 1; j < num; j++) {
            if (students[i].score < students[j].score) {
                Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }

    printf("Sort completed!\n");
}

void save_student(const Student *students, int num) {
    FILE *fp = fopen("students.txt", "w");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }

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

    fclose(fp);
    printf("Data saved to file successfully!\n");
}

void load_student(Student *students, int *num) {
    FILE *fp = fopen("students.txt", "r");
    if (fp == NULL) {
        printf("File not found!\n");
        return;
    }

    while (!feof(fp) && *num < MAX_STUDENT_NUM) {
        fscanf(fp, "%s %d %f", students[*num].name, &students[*num].id, &students[*num].score);
        (*num)++;
    }

    fclose(fp);
    printf("Data loaded from file successfully!\n");
}

这个学生成绩管理系统使用了一个结构体 `Student` 来存储每个学生的信息，包括姓名、学号和成绩。其中用到了文件读写、数组排序等基本操作。