学生成绩管理系统

一个年级，相当链表A，该年级5个班，每个班5个人，相当于链表B1–B5
做一个学生成绩管理系统

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

struct Student
{
    char name[32];
    int Chinese;
    int math;
    int English;
    int sum;
    struct Student *next;
};

struct Class
{
    struct Student *head;
    struct Class *next;
};

//插入学生节点
struct Student *insertStudentHead(struct Student *head, struct Student *new)
{
    struct Student *point = head;

    if (head == NULL)
    {
        head = new;
        return new;
    }

    while (point->next != NULL)
    {
        point = point->next;
    }

    point->next = new;

    return head;
}

//学生链表
struct Student *createStudnetLink(struct Student *head, int classnum, int stunum)
{
    struct Student *new = NULL;
    int i;

    for (i = 0; i < stunum; i++)
    {
        new = (struct Student *)malloc(sizeof(struct Student));
        new->next = NULL;
        printf("请输入%d班的第%d个学生的学生名\n", classnum + 1, i + 1);
        scanf("%s", new->name);
        printf("请输入%d班的第%d个学生的语文成绩\n", classnum + 1, i + 1);
        scanf("%d", &(new->Chinese));
        printf("请输入%d班的第%d个学生的数学成绩\n", classnum + 1, i + 1);
        scanf("%d", &(new->math));
        printf("请输入%d班的第%d个学生的英语成绩\n", classnum + 1, i + 1);
        scanf("%d", &(new->English));
        new->sum = new->Chinese + new->math + new->English;
        head = insertStudentHead(head, new);
    }

    return head;
}

//插入班级节点
struct Class *insertClassHead(struct Class *head, struct Class *new)
{
    struct Class *point = head;

    if (head == NULL)
    {
        head = new;
        return new;
    }

    while (point->next != NULL)
    {
        point = point->next;
    }

    point->next = new;

    return head;
}

//创建班级节点
struct Class *createClassLink(struct Class *head, int classnum, int stunum)
{
    struct Class *new = NULL;
    struct Student *stuhead = NULL;
    int i;

    for (i = 0; i < classnum; i++)
    {
        new = (struct Class *)malloc(sizeof(struct Class));
        new->next = NULL;
        new->head = createStudnetLink(stuhead, i, stunum);
        head = insertClassHead(head, new);
    }

    return head;
}

//最高分
int getMax(struct Class *head)
{
    struct Class *p1 = head;
    struct Student *p2 = NULL;
    int max = 0;

    while (p1 != NULL)
    {
        p2 = p1->head;
        while (p2 != NULL)
        {
            if (max < p2->sum)
            {
                max = p2->sum;
            }
            p2 = p2->next;
        }

        p1 = p1->next;
    }

    return max;
}

//最低分
int getMin(struct Class *head)
{
    struct Class *p1 = head;
    struct Student *p2 = NULL;
    int min = 10000;

    while (p1 != NULL)
    {
        p2 = p1->head;
        while (p2 != NULL)
        {
            if (min > p2->sum)
            {
                min = p2->sum;
            }

            p2 = p2->next;
        }

        p1 = p1->next;
    }

    return min;
}

//平均分
float averAge(struct Class *head, int classnum, int stunum)
{
    struct Class *p1 = head;
    struct Student *p2 = NULL;
    int sum = 0;

    while (p1 != NULL)
    {
        p2 = p1->head;
        while (p2 != NULL)
        {
            sum += p2->sum;
            p2 = p2->next;
        }

        p1 = p1->next;
    }

    return (float)sum / (classnum * stunum);
}

//打印学生信息
void printClassStudent(struct Class *head)
{
    struct Class *p1 = head;
    struct Student *p2 = NULL;

    while (p1 != NULL)
    {
        p2 = p1->head;
        while (p2 != NULL)
        {
            printf("学生的学生名是%s\n", p2->name);
            printf("学生的语文成绩是:%d\n", p2->Chinese);
            printf("学生的数学成绩是:%d\n", p2->math);
            printf("学生的英语成绩是:%d\n", p2->English);
            printf("学生的总分是%d\n", p2->sum);
            p2 = p2->next;
        }

        p1 = p1->next;
    }
}

int main()
{
    int a;
    int b;
    int max = 0;
    int min=0;
    float aver=0;

    struct Class *head = NULL;

    printf("请输入班级数\n");
    scanf("%d", &a);
    printf("请输入学生数\n");
    scanf("%d", &b);

    head = createClassLink(head, a, b);

    printClassStudent(head);

    max = getMax(head);
    printf("max=%d\n", max);
    
    min=getMin(head);
    printf("min=%d\n",min);

    aver=averAge(head,a,b);
    printf("aver=%.2f\n",aver);

    return 0;
}