1、实验内容（参考以下功能，可增加） 对学生基本信息，包括学号、姓名、至少三门课成绩。 ① 学生基本信息录入； ② 学生基本信息的输出； ③ 按学号查询学生信息（学号、姓名、成绩）； ④ 按学号修改某学生信息并输出； ⑤ 计算平均成绩（计算总分、平均分、最高分、最低分等）； ⑥ 删除某学生信息； ⑦ 添加某学生信息 ⑧ 输出平均分大于80分的同学信息（按条件输出）使用C语言编辑一个程序实现上述目的

好的，下面是一个使用C语言编写的学生信息管理系统程序，包括了上述所有功能：

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

#define MAX_STUDENTS 100

struct student {
    int id;
    char name[20];
    int scores[3];
};

struct student students[MAX_STUDENTS];
int num_students = 0;

void add_student()
{
    if (num_students >= MAX_STUDENTS) {
        printf("Error: too many students!\n");
        return;
    }

    struct student s;
    printf("Enter student ID: ");
    scanf("%d", &s.id);
    printf("Enter student name: ");
    scanf("%s", s.name);
    printf("Enter scores for three courses: ");
    scanf("%d%d%d", &s.scores[0], &s.scores[1], &s.scores[2]);

    students[num_students++] = s;
}

void print_student(struct student s)
{
    printf("%d\t%s\t%d\t%d\t%d\n", s.id, s.name, s.scores[0], s.scores[1], s.scores[2]);
}

void list_students()
{
    printf("ID\tName\tCourse1\tCourse2\tCourse3\n");
    for (int i = 0; i < num_students; i++) {
        print_student(students[i]);
    }
}

void find_student()
{
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            print_student(students[i]);
            return;
        }
    }

    printf("Error: student not found!\n");
}

void update_student()
{
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            printf("Enter new name: ");
            scanf("%s", students[i].name);
            printf("Enter new scores for three courses: ");
            scanf("%d%d%d", &students[i].scores[0], &students[i].scores[1], &students[i].scores[2]);
            print_student(students[i]);
            return;
        }
    }

    printf("Error: student not found!\n");
}

void delete_student()
{
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            for (int j = i; j < num_students - 1; j++) {
                students[j] = students[j + 1];
            }
            num_students--;
            printf("Student deleted.\n");
            return;
        }
    }

    printf("Error: student not found!\n");
}

void calculate_average()
{
    int total_scores[3] = {0};
    int max_scores[3] = {0};
    int min_scores[3] = {100};
    double avg_scores[3] = {0};

    for (int i = 0; i < num_students; i++) {
        for (int j = 0; j < 3; j++) {
            total_scores[j] += students[i].scores[j];
            if (students[i].scores[j] > max_scores[j]) {
                max_scores[j] = students[i].scores[j];
            }
            if (students[i].scores[j] < min_scores[j]) {
                min_scores[j] = students[i].scores[j];
            }
        }
    }

    for (int j = 0; j < 3; j++) {
        avg_scores[j] = (double)total_scores[j] / num_students;
        printf("Average score for course %d: %.2lf\n", j + 1, avg_scores[j]);
        printf("Max score for course %d: %d\n", j + 1, max_scores[j]);
        printf("Min score for course %d: %d\n", j + 1, min_scores[j]);
    }
}

void find_excellent_students()
{
    printf("Excellent students (>80): \n");
    printf("ID\tName\tCourse1\tCourse2\tCourse3\n");
    for (int i = 0; i < num_students; i++) {
        double avg_score = (double)(students[i].scores[0] + students[i].scores[1] + students[i].scores[2]) / 3;
        if (avg_score > 80) {
            print_student(students[i]);
        }
    }
}

void menu()
{
    printf("\n");
    printf("1. Add student\n");
    printf("2. List students\n");
    printf("3. Find student\n");
    printf("4. Update student\n");
    printf("5. Delete student\n");
    printf("6. Calculate average scores\n");
    printf("7. Find excellent students\n");
    printf("0. Exit\n");
    printf("Enter your choice: ");
}

int main()
{
    int choice;
    do {
        menu();
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                list_students();
                break;
            case 3:
                find_student();
                break;
            case 4:
                update_student();
                break;
            case 5:
                delete_student();
                break;
            case 6:
                calculate_average();
                break;
            case 7:
                find_excellent_students();
                break;
            case 0:
                printf("Goodbye!\n");
                break;
            default:
                printf("Error: invalid choice!\n");
        }
    } while (choice != 0);

    return 0;
}

这个程序使用了结构体来存储学生信息，使用了循环和条件语句来实现各种功能。