C语言写成绩系统(只用到指针以及之前的内容)

(注:不能用到结构体)C语言写一个成绩管理系统,模板在末尾张照片,一共有五个功能,具体内容请看照片

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/**
 * @file dome34.c
 * @author your name (you@domain.com)
 * @brief 
 * @version 0.1
 * @date 2022-11-24
 * 
 * @copyright Copyright (c) 2022
 * 简易版班级成绩管理系统
 */

#include<stdio.h>
#define Max 50//最大人数为50个人,如果想更大,就改变这个值
int number =4;//记录学生信息的人数;
//显示学生成绩的函数
void show(long int *num,char (*name)[10],char (*class)[10],float (*score)[3]){
printf("\tNo.\t\tName");
int i=0;
int j=0;
for(i=0;i<3;i++){
    if(i==2){printf("\t\t%s",class[i]);}
    else{printf("\t%s",class[i]);}
}
printf("\n");

for(i=0;i<number;i++){
    if(num[i]==0)
    {
        continue;
    }//学号为0,相当于没有该学生信息
    else{
    printf("\t%ld",num[i]);
    printf("\t%s",name[i]);
    for(j=0;j<3;j++)
    {
      printf("\t%.1f\t",score[i][j]);
    }
    printf("\n");
    }
}
}
//搜索学生id是否存在,并返回下标
int find(long int id,long int *num){
   int i,index;
  for(i=0;i<number;i++){
    if(id==num[i]){
        index=i;//记录下标位置
        break;
    }
    else{continue;}
  }
  if(i==number)
  {return -1;}
  else
  {return index;}
}
//根据学生id搜索分数
void query(long int id,long int *num,char (*class)[10],float (*score)[3]){
  int i,j,index;
  index=find(id,num);
  if(index==-1){printf("没有该学生信息!\n");}
  else//找到就输出学生信息
  {
    printf("你的成绩如下:\n");
    for(i=0;i<3;i++){
    if(i==2){printf("\t\t%s\n",class[i]);}
    else{printf("\t%s",class[i]);}
    }
    for(j=0;j<3;j++)
    {
      printf("\t%.1f\t",score[index][j]);
    }
    printf("\n");
  } 
}
void update(long int id,long int *num,char (*name)[10],float (*score)[3])
{
   int i,j,index,a;
  index=find(id,num);
  if(index==-1){printf("没有该学生信息!\n");}
  else//找到就输出学生信息
  {
    printf("---------------\n");
    printf("1、修改ID号\n");
    printf("2、修改姓名\n");
    printf("3、修改成绩\n");
    scanf("%d",&a);
    switch (a)
    {
    case 1:
    printf("请输入新的学号:");
    scanf("%s",&num[index]);
    printf("修改成功!\n");
        break;
    case 2:
    printf("请输入新的姓名:");
    scanf("%s",&name[index]);
    printf("修改成功!\n");
        break;
    case 3:
    printf("1、修改Computer\n");
    printf("2、修改Math\n");
    printf("3、修改English\n");
    int b;
    scanf("%d",&b);
    switch (b)
    {
    case 1:
    printf("请输入新成绩:");
    scanf("%f",&score[index][0]);
    printf("修改成功!\n");
        break;
    case 2:
    printf("请输入新成绩:");
    scanf("%f",&score[index][1]);
    printf("修改成功!\n");
        break;
    case 3:
    printf("请输入新成绩:");
    scanf("%f",&score[index][2]);
    printf("修改成功!\n");
        break;    
    default:
        break;
    }

        break;
    default:
        break;
    }
  }
}
//删除学生信息
void reMove(long int id,long int *num,char (*name)[10],float (*score)[3]){
   int i,j,index;
  index=find(id,num);
  if(index==-1){printf("没有该学生信息!\n");}
  else//找到就删除
  {
     num[index]=0;
     name[index][10]='\0';
     for(i=0;i<3;i++){
        score[index][j]=0.0;
     }
     printf("删除成功!\n");
  }
}
//删除学生信息
void add(long int *num,char (*name)[10],float (*score)[3]){
  printf("请输入学号:");
  scanf("%ld",&num[number]);
  printf("请输入姓名:");
  scanf("%s",&name[number]);
  printf("请输入Computer成绩:");
  scanf("%f",&score[number][0]);
  printf("请输入Math成绩:");
  scanf("%f",&score[number][1]);
  printf("请输入English成绩:");
  scanf("%f",&score[number][2]);
  printf("添加成功!\n");
  number++;
}
int main(){

   long int num[Max]={20210101,20210102,20210103,20210104};
   char name[Max][10]={"Stu_01","Stu_02","Stu_03","Stu_04"};
   char class[3][10]={"Computer","Math","English"};
   float score[Max][3]={{60.5,97.0,90.5},{88.5,67.5,88.1},{72.3,75.0,92.0},{66.8,86.0,45.5}};
   int i;
   char ch;
   long int id;
   int TuiChu=1;
   printf("-------------------------------------\n");
   printf("d、显示学生成绩信息\n");
   printf("q、查找学生成绩信息\n");
   printf("u、更新学生成绩信息\n");
   printf("r、删除学生成绩信息\n");
   printf("a、增加学生成绩信息\n");
   printf("p、退出系统\n");
   for(;;){
   scanf("%c",&ch);
   switch(ch){
    case 'd':
    show(num,name,class,score);
    break;

    case 'q':
    printf("请输入你的学号:");
    scanf("%ld",&id);
    query(id,num,class,score);
    break;

    case 'u':
    printf("请输入你的学号:");
    scanf("%ld",&id);
    update(id,num,name,score);
    break;

    case 'r':
    printf("请输入你的学号:");
    scanf("%ld",&id);
    reMove(id,num,name,score);
    break;

    case 'a':
    add(num,name,score);
    break;  
    case 'p':
    TuiChu=0;
    break;
   }  
   if(TuiChu==0){break;}  
   }
      return 0;
}

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#include<stdio.h>
#include<windows.h>
#define Max 25
#define obj_num 5
struct Stu
{
    char Name[25];     //姓名
    int Number;        //学号
    int Language_score;//语文成绩
    int Math_score;    //数学成绩
    int English_score; //英语成绩
    int PE_score;      //体育成绩
    int C_score;       //C语言成绩
    int Sum_score;     //总成绩
};
void input(struct Stu Class[],int j)
{
    printf("输入第%d位同学姓名:",j+1);
    scanf("%s",Class[j].Name);
    getchar();
    printf("输入第%d位同学学号:",j+1);
    scanf("%d",&Class[j].Number);
    printf("输入第%d位同学语文成绩:",j+1);
    scanf("%d",&Class[j].Language_score);
    printf("输入第%d位同学数学成绩:",j+1);
    scanf("%d",&Class[j].Math_score);
    printf("输入第%d位同学英语成绩:",j+1);
    scanf("%d",&Class[j].English_score);
    printf("输入第%d位同学体育成绩:",j+1);
    scanf("%d",&Class[j].PE_score);
    printf("输入第%d位同学C语言成绩:",j+1);
    scanf("%d",&Class[j].C_score);
    Class[j].Sum_score=Class[j].Language_score+Class[j].Math_score+Class[j].English_score+Class[j].PE_score+Class[j].C_score;
}
void output(struct Stu Class[],int n)
{
    printf("---------------------------------------------\n");
    printf("姓名  学号  语文  数学  英语  体育  C语言  总分");
    printf("\n");
    int j;
    for(j=0; j<n; j++)
    {
        printf("%5s",Class[j].Name);
        printf("%5d",Class[j].Number);
        printf("%6d",Class[j].Language_score);
        printf("%6d",Class[j].Math_score);
        printf("%6d",Class[j].English_score);
        printf("%6d",Class[j].PE_score);
        printf("%6d",Class[j].C_score);
        printf("%7d",Class[j].Sum_score);
        printf("\n");
    }
    printf("---------------------------------------------\n");
}
void outputOne(struct Stu Class[],int j)
{
    printf("姓名  学号  语文  数学  英语  体育  C语言  总分");
    printf("\n");
    printf("%5s",Class[j].Name);
    printf("%5d",Class[j].Number);
    printf("%6d",Class[j].Language_score);
    printf("%6d",Class[j].Math_score);
    printf("%6d",Class[j].English_score);
    printf("%6d",Class[j].PE_score);
    printf("%6d",Class[j].C_score);
    printf("%7d",Class[j].Sum_score);
    printf("\n");
}
void Sort(struct Stu Class[],int n)
{
    int j,k;
    struct Stu t;
    for(j=0; j<n-1; j++)
    {
        for(k=0; k<n-j-1; k++)
        {
            if(Class[k].Sum_score<Class[k+1].Sum_score)
            {
                t=Class[k];
                Class[k]=Class[k+1];
                Class[k+1]=t;
            }
        }
    }
}
int search(int number,int n,struct Stu Class[])
{
    int i,p=0;
    for(i=0; i<n; i++)
    {
        if(Class[i].Number==number)
        {
            p=i;
            return p;
        }
    }
    return -1;
}
void modify(int number,int n,struct Stu Class[])
{
    int index=search(number,n,Class);
    if(index==-1)
    {
        printf("找不到该学号\n");
    }
    else
    {
        printf("学号%d的学生是第%d位\n",number,index+1);
        input(Class,index);
        printf("修改成功\n");
        output(Class,n);
    }
}
void del(int number,int n,struct Stu Class[])
{
    int index=search(number,n,Class);
    if(index==-1)
    {
        printf("找不到该学号\n");
    }
    else
    {
        printf("学号%d的学生是第%d位\n",number,index);
        int i;
        for(i=index; i<n-1; i++)
        {
            Class[i]= Class[i+1];
        }
        printf("删除成功\n");
        output(Class,n-1);
    }
}
double calave(int n,struct Stu Class[],double ave[])
{
    int Language_score_sum=0;
    int Math_score_sum=0;
    int English_score_sum=0;
    int PE_score_sum=0;
    int C_score_sum=0;
    for(int i=0; i<n; i++)
    {
        Language_score_sum+=Class[i].Language_score;
        Math_score_sum+=Class[i].Math_score;
        English_score_sum+=Class[i].English_score;
        PE_score_sum+=Class[i].PE_score;
        C_score_sum+=Class[i].C_score;
    }
    ave[0]=(double)Language_score_sum/n;
    ave[1]=(double)Math_score_sum/n;
    ave[2]=(double)English_score_sum/n;
    ave[3]=(double)PE_score_sum/n;
    ave[4]=(double)C_score_sum/n;
}
void save(int n,struct Stu Class[])
{
    FILE *fp;
    fp = fopen("score_data.txt","w");
    if(fp == NULL)
    {
        printf("error!");
        return;
    }
    else
    {
        for(int j=0; j<n; j++)
        {
            fprintf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,Class[j].Number,Class[j].Language_score,Class[j].Math_score,Class[j].English_score,Class[j].PE_score,Class[j].C_score,Class[j].Sum_score);
        }
        printf("文件写入成功\n");
    }
    fclose(fp);
}
int read(int n,struct Stu Class[])
{
    FILE *fp;
    fp = fopen("score_data.txt","r");
    int count=0;
    if(fp == NULL)
    {
        printf("error!");
        return 0;
    }
    else
    {
        for(int j=0; j<n; j++)
        {
            int flag=fscanf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,&Class[j].Number,&Class[j].Language_score,&Class[j].Math_score,&Class[j].English_score,&Class[j].PE_score,&Class[j].C_score,&Class[j].Sum_score);
            if(flag!=-1) count++;
        }
        printf("文件读取成功\n");
    }
    fclose(fp);
    return count;
}
void menu(struct Stu Class[])
{
    int n=0,count;
    int option=1;
    while(option<=9&&option>=1)
    {
        printf("------------------------\n");
        printf("------学生成绩管理------\n");
        printf("------1.输入成绩  ------\n");
        printf("------2.输出成绩  ------\n");
        printf("------3.按总成绩排序----\n");
        printf("------4.按学号查询成绩--\n");
        printf("------5.修改信息  ------\n");
        printf("------6.删除学生  ------\n");
        printf("------7.计算各科平均分--\n");
        printf("------8.文件读入  ------\n");
        printf("------9.保存至文件------\n");
        printf("------other.退出  ------\n");
        printf("------------------------\n");
        printf("输入选项:");
        scanf("%d",&option);
        switch(option)
        {
            case 1:
            {
                system("cls");
                printf("输入学生的个数(不大于%d):",Max-n);
                scanf("%d",&count);
                while(count--)
                {
                    input(Class,n++);
                }
                output(Class,n);
                break;
            }
            case 2:
            {
                system("cls");
                output(Class,n);
                break;
            }
            case 3:
            {
                system("cls");
                Sort(Class,n);
                output(Class,n);
                break;
            }
            case 4:
            {
                system("cls");
                int number;
                printf("输入要查找的学号:");
                scanf("%d",&number);
                int index=search(number,n,Class);
                if(index==-1)
                {
                    printf("查找失败\n");
                }
                else
                {
                    printf("查找成功\n");
                    outputOne(Class,index);
                }
                break;
            }
            case 5:
            {
                system("cls");
                output(Class,n);
                int number;
                printf("输入要修改成绩的学生对应的学号:");
                scanf("%d",&number);
                modify(number,n,Class);
                output(Class,n);
                break;
            }
            case 6:
            {
                system("cls");
                output(Class,n);
                int number;
                printf("输入要删除的学号:");
                scanf("%d",&number);
                del(number,n,Class);
                n--;
                system("cls");
                output(Class,n);
                break;
            }
            case 7:
            {
                system("cls");
                output(Class,n);
                double ave[obj_num];
                calave(n,Class,ave);
                char str[]="平均分";
                printf("\n");
                printf("%5s",str);
                printf("     ");
                printf("%5.2lf",ave[0]);
                printf("%6.2lf",ave[1]);
                printf("%6.2lf",ave[2]);
                printf("%6.2lf",ave[3]);
                printf("%6.2lf",ave[4]);
                printf("\n");
                break;
            }
            case 8:
            {
                system("cls");
                n-=n; 
                n+=read(Max,Class);
                break;
            }
            case 9:
            {
                system("cls");
                save(n,Class);
                break;
            }
            default :
            {
                break;
            }
        }
    }
}
int main()
{
    struct Stu Class [Max];
    menu(Class);
    return 0;
}