c语言写个学生成绩管理系统

以下是两种C语言实现学生成绩管理系统的例子：

1.利用结构体数组实现学生成绩管理系统

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

#define MAX_STUDENT_NUM 100

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

int main() {
    struct Student students[MAX_STUDENT_NUM];
    int count = 0;
    char end[] = "end";
    while (1) {
        printf("请输入学生姓名：");
        scanf("%s", students[count].name);
        if (strcmp(students[count].name, end) == 0) {
            break;
        }
        printf("请输入学生学号：");
        scanf("%d", &students[count].id);
        printf("请输入学生分数：");
        scanf("%f", &students[count].score);
        count++;
    }
    printf("学生信息如下：\n");
    printf("姓名\t学号\t分数\n");
    for (int i = 0; i < count; i++) {
        printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].score);
    }
    return 0;
}

2.利用结构体实现学生成绩管理系统（包含增删改查功能）

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

#define MAX_STUDENT_NUM 100

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

int findStudentById(struct Student students[], int count, int id) {
    for (int i = 0; i < count; i++) {
        if (students[i].id == id) {
            return i;
        }
    }
    return -1;
}

void addStudent(struct Student students[], int *count) {
    if (*count >= MAX_STUDENT_NUM) {
        printf("学生信息已满，无法添加！\n");
        return;
    }
    printf("请输入学生姓名：");
    scanf("%s", students[*count].name);
    printf("请输入学生学号：");
    scanf("%d", &students[*count].id);
    printf("请输入学生分数：");
    scanf("%f", &students[*count].score);
    (*count)++;
    printf("添加成功！\n");
}

void deleteStudent(struct Student students[], int *count) {
    int id;
    printf("请输入要删除的学生学号：");
    scanf("%d", &id);
    int index = findStudentById(students, *count, id);
    if (index == -1) {
        printf("未找到该学生！\n");
        return;
    }
    for (int i = index; i < *count - 1; i++) {
        students[i] = students[i + 1];
    }
    (*count)--;
    printf("删除成功！\n");
}

void modifyStudent(struct Student students[], int count) {
    int id;
    printf("请输入要修改的学生学号：");
    scanf("%d", &id);
    int index = findStudentById(students, count, id);
    if (index == -1) {
        printf("未找到该学生！\n");
        return;
    }
    printf("请输入学生姓名：");
    scanf("%s", students[index].name);
    printf("请输入学生分数：");
    scanf("%f", &students[index].score);
    printf("修改成功！\n");
}

void queryStudent(struct Student students[], int count) {
    int id;
    printf("请输入要查询的学生学号：");
    scanf("%d", &id);
    int index = findStudentById(students, count, id);
    if (index == -1) {
        printf("未找到该学生！\n");
        return;
    }
    printf("学生信息如下：\n");
    printf("姓名\t学号\t分数\n");
    printf("%s\t%d\t%.2f\n", students[index].name, students[index].id, students[index].score);
}

int main() {
    struct Student students[MAX_STUDENT_NUM];
    int count = 0;
    while (1) {
        printf("请选择操作：\n");
        printf("1.输入学生信息\n");
        printf("2.输出学生信息\n");
        printf("3.查询学生信息\n");
        printf("4.修改学生信息\n");
        printf("5.删除学生信息\n");
        printf("6.退出程序\n");
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                addStudent(students, &count);
                break;
            case 2:
                printf("学生信息如下：\n");
                printf("姓名\t学号\t分数\n");
                for (int i = 0; i < count; i++) {
                    printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].score);
                }
                break;
            case 3:
                queryStudent(students, count);
                break;
            case 4:
                modifyStudent(students, count);
                break;
            case 5:
                deleteStudent(students, &count);
                break;
            case 6:
                return 0;
            default:
                printf("输入有误，请重新输入！\n");
                break;
        }
    }
    return 0;
}