学生成绩管理系统c语言

学生成绩管理系统是一个比较典型的计算机应用程序，可以帮助学校、教师和学生管理学生的成绩信息，包括课程、考试、分数、排名等等。下面是一个简单的学生成绩管理系统的C语言代码示例：

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

#define MAX_SIZE 100

typedef struct {
    int id;
    char name[20];
    double score;
} Student;

void add(Student *students, int *num) {
    if (*num >= MAX_SIZE) {
        printf("The student list is full.\n");
        return;
    }

    Student student;
    printf("Please enter the student ID: ");
    scanf("%d", &student.id);
    printf("Please enter the student name: ");
    scanf("%s", student.name);
    printf("Please enter the student score: ");
    scanf("%lf", &student.score);

    students[*num] = student;
    (*num)++;
}

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

    for (int i = 0; i < num; i++) {
        if (students[i].id == id) {
            printf("ID: %d, Name: %s, Score: %.2lf\n", students[i].id, students[i].name, students[i].score);
            return;
        }
    }

    printf("The student is not found.\n");
}

void print(Student *students, int num) {
    printf("ID\tName\tScore\n");

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

void sort(Student *students, int num) {
    for (int i = 0; i < num; 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;
            }
        }
    }
}

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

    while (1) {
        printf("Please select the operation:\n");
        printf("1. Add student\n");
        printf("2. Search student\n");
        printf("3. Print all students\n");
        printf("4. Sort by score\n");
        printf("5. Exit\n");
        printf("Your choice: ");

        int choice;
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add(students, &num);
                break;
            case 2:
                search(students, num);
                break;
            case 3:
                print(students, num);
                break;
            case 4:
                sort(students, num);
                break;
            case 5:
                exit(0);
            default:
                printf("Invalid choice.\n");
                break;
        }

        printf("\n");
    }

    return 0;
}

这个示例程序实现了四个基本功能：添加学生、搜索学生、打印所有学生、按成绩排序。在程序中，我们使用了结构体来表示学生信息，使用了指针来动态修改学生列表的大小。当然，这个程序还有很多可以优化和改进的地方，比如增加文件读写功能、使用链表来存储学生列表等等。