学生成绩管理系统

// 学生成绩管理系统.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
#include "stdio.h"
#include "stdlib.h"
typedef int Status;
typedef float Elemtype;
constexpr auto ERROR = -1;
constexpr auto OK = 0;
int i = 1;
constexpr auto N = 10000;
int zong = 5;
 struct Student {
    char name[20];
    int num;
    int age;
    Elemtype Chinese;
    Elemtype math;
    Elemtype English;
    Elemtype Science;
 } stu[N] = { {"zhangsan",1000,18,120,115,130,279},
              {"lisi",1001,17,127,129,118,208} ,
              {"wangyi",1002,17,119,121,88,195},
              {"maliu",1003,17,97,149,108,198} };
int main()
{
    FILE *fp=NULL;
    void add(struct Student stu[], int weizhi, int nums);
    void del(struct Student stu[], int num);
    void list(struct Student stu[]);
    void find(struct Student stu[]);
    void change(struct Student stu[], int p);
    fopen_s(&fp, "data.bin", "rb");
    if (!feof(fp))
    {
        fread(&zong, sizeof(int), 1, fp);
        for (int i = 0; i < zong; i++) {
            fread(&stu[i], sizeof(Student), 1, fp);
        }
    }
    fclose(fp);
    printf("\t***********************************************\n");
    printf("\t\t       学生成绩管理系统\n");
    printf("\t说明：该系统可输入并存储学生姓名、学号、年龄、\n\t      语文、数学、英语、理综成绩。\n");
    printf("\t      初始状态下有5组数据，在宸哥的帮助下实现了\n\t      存盘功能,特此鸣谢\n");
    printf("\t          胡浩龙  版权所有   Copyright2019\n");
    printf("\t请根据以下提示操作:\n");
    fu:printf("\t************************************************\n");
    printf("\t\t输入1，增加学生。\n");
    printf("\t\t输入2，删除学生。\n");
    printf("\t\t输入3，修改学生成绩。\n");
    printf("\t\t输入4，查找学生。\n");
    printf("\t\t输入5，列出全部学生。\n");
    printf("\t\t输入6，回到主菜单。\n");
    printf("\t\t输入0，退出本系统。\n");
    printf("\t************************************************\n");
    int a;
    printf("\t\t请输入选项：");
    ck:printf("\t\t");
    scanf_s("%d", &a);
    switch (a)
    {
    case 1:printf("\n\t\t本次操作要加入的学生数量为：");
           int m, n;
           scanf_s("%d", &n);
           printf("\n\t\t加入到第几个学生后面：");
           scanf_s("%d", &m);
           add(stu, m, n);
           break;
    case 2:printf("\n\t\t请输入要删除学生的学号：");
           int b;
           scanf_s("%d", &b);
           del(stu, b);
           break;
    case 3:printf("\n\t\t请输入要更改成绩的学生学号：");
           int g;
           scanf_s("%d", &g);
           change(stu, g);
           break;
    case 4:find(stu);
           break;
    case 5:list(stu);
           break;
    case 6:printf("\n\t\t          欢迎回来!!\n");
           goto fu;
    case 0:
        fopen_s(&fp, "data.bin", "wb");
        fwrite(&zong, sizeof(int), 1, fp);
        for (int i = 0; i < zong; i++) {
            fwrite(&stu[i], sizeof(Student), 1, fp);
        }
        fclose(fp);
        return 0;
    }
    printf("\n\t\t本次操作已经完成，请继续输入：\n");
    goto ck;
}
void add(struct Student stu[], int weizhi, int nums)
{  int flag=0;
   if(weizhi>zong)
    {
    printf("\t\t输入有误！！");
    flag = 1;
    }
   if (flag == 0)
   {
       for (int i = zong+nums; i >=weizhi ; i--)
       {
           stu[i+nums] = stu[i];
       }
       for (int i = weizhi; i < weizhi + nums; i++)
       {
           printf("\t\t请输入名字：");
           scanf_s("%s", stu[i].name, 20);
           int a = 1, temp;
       k:printf("\t\t请输入学号：");
           scanf_s("%d", &temp);
           while (a)
           {
               for (int j = 0; j <= weizhi; j++)
               {
                   if (stu[j].num == temp)
                   {
                       printf("\t\t学号重复了！！\n");
                       goto k;
                   }
                   else
                   {
                       a = 0;
                   }
               }
               stu[i].num = temp;
           }
           printf("\t\t请输入学生年龄：");
           scanf_s("%d", &stu[i].age);
           printf("\t\t请依次输入各科成绩：");
           scanf_s("%f%f%f%f", &stu[i].Chinese, &stu[i].math, &stu[i].English, &stu[i].Science);
       }
       zong = zong + nums;
   }
   else
   {
       printf("\n");
   }
}
void del(struct Student stu[], int num)
{
    if(zong==0)
    {
        printf("\t\t目前系统中没有数据！\n");
    }
    int temp = 0;
    for (int i = 0; i < zong; i++)
    {
        if (stu[i].num==num)
        {
            for (int j = i; j < zong; j++)
            {
                stu[j] = stu[j + 1];
            }
            printf("\t\t已完成删除操作！\n");
            temp = 1;
            zong = zong - 1;
            break;
        }
    }
    if (temp == 0)
        printf("\t\t 输入学号有误！！");
}
void list(struct Student stu[])
{
    for (int i = 0; i < zong; i++)
    {
        printf("\n");
        printf("\t\t姓名：%s  ", stu[i].name);
        printf("学号：%d  ", stu[i].num);
        printf("年龄：%d \n ",stu[i].age);
        printf("  \t\t成绩为：语文%.2f分,数学%.2f分,英语%.2f分，理综%.2f分\n",stu[i].Chinese,stu[i].math,stu[i].English,stu[i].Science);
    }
}
void find(struct Student stu[])
{
    int flag = 0, a;
    printf("\t\t请输入学生的学号：");
    scanf_s("%d", &a);
        for (int i = 0; i < zong; i++)
        {
            if (stu[i].num == a)
            {
                printf("\n\t\t学号为%d的学生叫做%s，他的成绩如下：\n", stu[i].num, stu[i].name);
                printf("\t\t语文%.2f分，数学%.2f分，英语%.2f分，理综%.2f分\n", stu[i].Chinese, stu[i].math, stu[i].English, stu[i].Science);
                flag = 1;
                break;
            }
        }
        if (flag==0)
        {
            printf("\t\t输入学号不存在！！\n");
        }
}
void change(struct Student stu[], int p)
{
    int flag = 0;
    for (int i = 0; i < zong; i++)
    {
        if (stu[i].num == p)
        {
            next:printf("\t\t更改语文成绩请输入1\n");
            printf("\t\t更改数学成绩请输入2\n");
            printf("\t\t更改英语成绩请输入3\n");
            printf("\t\t更改理综成绩请输入4\n");
            int d;
            printf("\t\t");
            scanf_s("%d", &d);
            switch (d)
            {
            case 1: printf("\t\t当前该同学语文成绩为%.2f，请输入更改后成绩：", stu[i].Chinese);
                    float u;
                    scanf_s("%f", &u);
                    stu[i].Chinese = u;
                    printf("\n\t\t更改已经完成！继续更改请输入1，退出输入0\n\t\t");
                    flag = 1;
                    int y1;
                    scanf_s("\n\t\t%d", &y1);
                    if (y1==1)
                    {
                        goto next;
                    }
                    else break;
            case 2: printf("\t\t当前该同学数学成绩为%.2f，请输入更改后成绩：", stu[i].math);
                float s;
                scanf_s("%f", &s);
                stu[i].math = s;
                printf("\n\t\t更改已经完成！继续更改请输入1，退出输入0\n\t\t");
                flag = 1;
                int y2;
                scanf_s("\n\t\t%d", &y2);
                if (y2 == 1)
                {
                    goto next;
                }
                else break;
            case 3: printf("\t\t当前该同学英语成绩为%.2f，请输入更改后成绩：", stu[i].English);
                float u1;
                scanf_s("%f", &u1);
                stu[i].English = u1;
                printf("\n\t\t更改已经完成！继续更改请输入1，退出输入0\n\t\t");
                flag = 1;
                int y3;
                scanf_s("\n\t\t%d", &y3);
                if (y3 == 1)
                {
                    goto next;
                }
                else break;
            case 4: printf("\t\t当前该同学理综成绩为%.2f，请输入更改后成绩：", stu[i].Science);
                float u2;
                scanf_s("%f", &u2);
                stu[i].Science = u2;
                printf("\n\t\t更改已经完成！继续更改请输入1，退出输入0\n\t\t");
                flag = 1;
                int y4;
                scanf_s("\n\t\t%d", &y4);
                if (y4 == 1)
                {
                    goto next;
                }
                else break;
            }
        }
    }
    if (flag == 0)
        printf("\n\t\t输入学号有误！！");
}