c语言大作业学生成绩管理系统

根据提供的引用内容，C语言大作业学生成绩管理系统包括以下功能：

1. 录入每个学生的学号、姓名和各科考试成绩。
2. 计算每门课程的总分和平均分。
3. 计算每个学生的总分和平均分。
4. 按每个学生的总分由高到低排出名次表。

以下是一个示例代码，展示了如何实现学生成绩管理系统的部分功能：

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

// 定义学生结构体
typedef struct student {
    int stdio;
    char name[20];
    double chinese;
    double math;
    double english;
    double politics;
    double sum;
    struct student *next;
} Student;

// 录入学生信息
void input(Student **llist) {
    Student *p, *q;
    p = *llist;
    q = (Student *)malloc(sizeof(Student));
    printf("请输入学号：");
    scanf("%d", &(q->stdio));
    printf("请输入姓名：");
    scanf("%s", q->name);
    printf("请输入语文成绩：");
    scanf("%lf", &(q->chinese));
    printf("请输入数学成绩：");
    scanf("%lf", &(q->math));
    printf("请输入英语成绩：");
    scanf("%lf", &(q->english));
    printf("请输入政治成绩：");
    scanf("%lf", &(q->politics));
    q->sum = q->chinese + q->math + q->english + q->politics;
    q->next = NULL;
    if (*llist == NULL) {
        *llist = q;
    } else {
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = q;
    }
}

// 计算每门课程的总分和平均分
void calculateCourse(Student *llist) {
    double chineseSum = 0, mathSum = 0, englishSum = 0, politicsSum = 0;
    int count = 0;
    Student *p = llist;
    while (p != NULL) {
        chineseSum += p->chinese;
        mathSum += p->math;
        englishSum += p->english;
        politicsSum += p->politics;
        count++;
        p = p->next;
    }
    double chineseAvg = chineseSum / count;
    double mathAvg = mathSum / count;
    double englishAvg = englishSum / count;
    double politicsAvg = politicsSum / count;
    printf("语文总分：%lf 平均分：%lf\n", chineseSum, chineseAvg);
    printf("数学总分：%lf 平均分：%lf\n", mathSum, mathAvg);
    printf("英语总分：%lf 平均分：%lf\n", englishSum, englishAvg);
    printf("政治总分：%lf 平均分：%lf\n", politicsSum, politicsAvg);
}

// 计算每个学生的总分和平均分
void calculateStudent(Student *llist) {
    Student *p = llist;
    while (p != NULL) {
        p->sum = p->chinese + p->math + p->english + p->politics;
        double avg = p->sum / 4;
        printf("学号：%d 姓名：%s 总分：%lf 平均分：%lf\n", p->stdio, p->name, p->sum, avg);
        p = p->next;
    }
}

// 按每个学生的总分由高到低排出名次表
void sort(Student *llist) {
    Student *p, *q;
    int temp;
    char tempName[20];
    double tempSum;
    for (p = llist; p != NULL; p = p->next) {
        for (q = p->next; q != NULL; q = q->next) {
            if (q->sum > p->sum) {
                temp = p->stdio;
                p->stdio = q->stdio;
                q->stdio = temp;

                strcpy(tempName, p->name);
                strcpy(p->name, q->name);
                strcpy(q->name, tempName);

                tempSum = p->sum;
                p->sum = q->sum;
                q->sum = tempSum;
            }
        }
    }
    printf("名次表：\n");
    p = llist;
    int rank = 1;
    while (p != NULL) {
        printf("第%d名 学号：%d 姓名：%s 总分：%lf\n", rank, p->stdio, p->name, p->sum);
        rank++;
        p = p->next;
    }
}

int main() {
    Student *llist = NULL;
    int choice;
    while (1) {
        printf("\n--学生成绩管理系统--\n");
        printf("1. 录入学生信息\n");
        printf("2. 计算每门课程的总分和平均分\n");
        printf("3. 计算每个学生的总分和平均分\n");
        printf("4. 按每个学生的总分由高到低排出名次表\n");
        printf("0. 退出\n");
        printf("请输入您的选择：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                input(&llist);
                break;
            case 2:
                calculateCourse(llist);
                break;
            case 3:
                calculateStudent(llist);
                break;
            case 4:
                sort(llist);
                break;
            case 0:
                exit(0);
            default:
                printf("输入错误，请重新输入！\n");
                break;
        }
    }
    return 0;
}