C语言项目：学生成绩管理系统

C语言项目：学生成绩管理系统

   1、数据结构：学生信息：学号、姓名、年龄、性别、3课成绩

   2、功能：

  （1）增加学生记录

   (2)  删除学生记录

   (3)  查找学生信息(学号、姓名)

   (4)  修改学生信息

 （5）按照成绩排序、求平均值、最大值、最小值

   3、用户界面

   主菜单

   子菜单

   4、 批量生成测试数据

 

 //
 //  main.c
 //  Student System
 //
 //  Created by ma c on 15/7/22.
 //  Copyright (c) 2015年. All rights reserved.
 //  要求：编写一个学生成绩管理系统。

 #include <stdio.h>
 #include<string.h>
 #include<stdlib.h>
 #define N 50
 struct Student{
     char name[];
     int sno;
     int age;
     char gender;
     float EnglishScore;
     float mathScore;
     float chineseScore;
 }stu[N]={{"zhao",,,'M',,,},
          {"zhao",,,'F',,,},
          {"qian",,,'M',,,},
          {"hong",,,'F',,,},
          {"zhou",,,'M',,,},
          {"feng",,,'F',,,},
          {"wang",,,'M',,,},
          {"chen",,,'F',,,},
          {"geng",,,'F',,,},
          {"tang",,,'M',,,}};

 //添加数据
 void add(struct Student stu[],int pos,int nums);

 //删除数据
 void Delete_name(struct Student *stu,char Name[]);//(按姓名)
 void Delete_sno(struct Student *stu,int Sno);//(按学号)

 //修改数据
 void update(struct Student stu[],int Sno,int len);

 //查询子菜单
 void menu(struct Student stu[],int m);
 void search(struct Student stu[],int n,char Name[]);//按姓名查询
 void search1(struct Student stu[],int n,int Num);//按学号查询
 void sort(struct Student stu[],int n); //按总分高低排序
 void print(struct Student stu[],int n);
 void My_print_sum(struct Student stu[],int n);
 void max_min(struct Student stu[],int n);

 //主菜单
 void PrintScreen()
 {
     printf("------------------\n");
     printf("** 1.增加学生记录 **\n");
     printf("** 2.删除学生记录 **\n");
     printf("** 3.查找学生记录 **\n");
     printf("** 4.修改学生记录 **\n");
     printf("** 0.退出管理系统 **\n");
     printf("------------------\n");
 }

 //删除子菜单
 void deleteScreen()
 {
     printf("------------------\n");
     printf("** 0.按姓名删除数据**\n");
     printf("** 1.按学号删除数据**\n");
     printf("** 2.返回主菜单   **\n");
     printf("------------------\n");
     printf("please select 0-1:");
 }

 //查找子菜单
 void seekScreen()
 {
     printf("-------------------------\n");
     printf("****** 1.按姓名查找信息    *\n");
     printf("****** 2.按学号查找信息    *\n");
     printf("****** 3.查看所有学生成绩  *\n");
     printf("****** 4.成绩名次排序(总分)*\n");
     printf("****** 5.查看成绩最优最差  *\n");
     printf("****** 6.返回主菜单       *\n");
     printf("-------------------------\n");
     printf("please you select 1-6:");
 }

 //定义全局静态变量,统计目前结构体数组中的人数
 static int count = ;

 //主函数
 int main(int argc, const char * argv[])
 {
  int nums,temp;
  int snos;
  char names[];
  while()
  {
     PrintScreen();
     printf("please press enter_key continue!\n");
     getchar();
     printf("please select 0-4:");
     char c = getchar();
     switch(c)
     {
         case '':
               printf("please student'numbers you want to add:");
               scanf("%d",&nums);
               add(stu,count,nums);      //添加数据
               getchar();
               break;
         case '':
               deleteScreen();
               scanf("%d",&temp);
               switch(temp)
               {
                   case :
                       printf("please input delete name:");
                       scanf("%s",names);;
                       Delete_name(stu,names);  //删除数据(按姓名删除)
                       break;
                   case :
                       printf("please input delete sno:");
                       scanf("%d",&snos);
                       Delete_sno(stu,snos); //删除数据(按学号删除)
                       break;
                   case :
                       break;
               }
               getchar();
               break;
         case '':
               menu(stu,count);//查找数据
               getchar();
               break;
         case '':
               printf("please input update sno:");
               scanf("%d",&snos);
               update(stu,snos,count);     //修改数据
               break;
         case '':
               exit();                    //退出系统
         default:
               printf("data is illeagel!\n");
               getchar();
               break;                      //输入非法
     }
  }
  return ;
 }

 //添加数据
 void add(struct Student stu[],int pos,int nums)//开始位置、添加人数
 {
     for(int i=pos;i<pos+nums;i++)
     {
         printf("please input name:");
         scanf("%s",stu[i].name);
         int flag = ,sno;
         while(flag)
         {
           printf("please input sno:");
           scanf("%d",&sno);
             for(int j=;j<pos;j++)
             {
                 if(stu[j].sno==sno)
                 {
                     printf("sno is exist!\n");
                     break;
                 }
                 else
                 {
                     flag = ;
                 }
             }
             stu[i].sno = sno;
         }
         printf("please input age:");
         scanf("%d",&stu[i].age);
         printf("please input gender:(f/m or F/M)");
         getchar();
         scanf("%c",&stu[i].gender);
         printf("please input EnglishScore:");
         scanf("%f",&stu[i].EnglishScore);
         printf("please input mathScore:");
         scanf("%f",&stu[i].mathScore);
         printf("please input ChineseScore:");
         scanf("%f",&stu[i].chineseScore);
         printf("学生信息添加成功!\n");
     }
     count = count + nums;
 }

 //按学号删除
 void Delete_sno(struct Student *stu,int Sno)
 {
     if(count==)
     {
         printf("成员已为空!\n");
         return;
     }
     int flag=;
     for(int i=;i<count;i++)
     {
         if((stu+i)->sno==Sno)
         {
             for(int j=i;j<count;j++)
             {
                 *(stu+j)=*(stu+j+);
             }
             printf("\n");
             printf("学号为%d的学生已被删除\n",Sno);
             printf("\n");
             flag=;
             count = count-;
             break;
         }
     }
     if(flag==)
         printf("学号%d不存在.\n",Sno);
 }

 //按姓名删除
 void Delete_name(struct Student *stu,char Name[])
 {
     if(count==)
     {
         printf("成员已为空!\n");
         return;
     }
     int flag=;
     int n=count;
     for(int i=;i<n;i++)
     {
         if(strcmp((stu+i-flag)->name,Name)==)
         {
             for(int j=i-flag;j<count;j++)
             {
                 *(stu+j)=*(stu+j+);
             }
             printf("\n");
             printf("学生:%s 已被删除.\n",Name);
             printf("\n");
             flag=flag+;
             count =count -;
         }
     }
     if(flag==)
         printf("学生:%s 不存在.\n",Name);
 }

 //修改数据
 void update(struct Student stu[],int sno,int len)
 {
     char cs,cs1,cs2,cs3;
     char p[];
     int grade,i;
     for(i=; i<len; i++)
     {
         if(sno==stu[i].sno)
         {
             printf("please ask update name?(y/n):");
             getchar();
             cs = getchar();
             if(cs == 'y')
             {
                 printf("please input a new name:");
                 scanf("%s",p);
                 getchar();
                 strcpy(stu[i].name,p);
                 printf("update is succeed!\n");
             }

             printf("please ask update EnglishScore?(y/n):");
             cs1 = getchar();
             if(cs1 == 'y')
             {
                 printf("please input a new grade:");
                 scanf("%d",&grade);
                 stu[i].EnglishScore = grade;
                 printf("update is succeed!\n");
             }

             printf("please ask update mathScore?(y/n):");
             getchar();
             cs2 = getchar();
             if(cs2 == 'y')
             {
                 printf("please input a new grade:");
                 scanf("%d",&grade);
                 stu[i].mathScore = grade;
                 printf("update is succeed!\n");
             }

             printf("please ask update chineseScore?(y/n):");
             getchar();
             cs3 = getchar();
             if(cs3 == 'y')
             {
                 printf("please input a new grade:");
                 scanf("%d",&grade);
                 stu[i].chineseScore = grade;
                 printf("update is succeed!\n");
                 break;
             }
             else
             {
                 getchar();
                 break;
             }
         }
         else if(i==len-)
         {
             printf("error,don't have the sno!");
             break;
         }
         else
         {
             continue;
         }
     }
 }

 //查询数据
 void menu(struct Student stu[],int m)
 {
     int logel = ;
     while(logel)
     {
         seekScreen();
         int n;
         scanf("%d",&n);
         char name[];
         int num;
         switch(n)
         {
             case  :
                 printf("请输入同学的姓名: ");
                 scanf("%s",name);
                 search(stu,count,name);
                 break;
             case  :
                 printf("\n请输入同学的学号: ");
                 scanf("%d",&num);
                 search1(stu,count,num);
                 break;
             case :
                 print(stu,count);
                 break;
             case :
                 sort(stu,count);
                 print(stu,count);
                 break;
             case :
                 max_min(stu,count);
                 break;
             case :
                 logel = ;
                 break;
             default:
                 logel = ;
                 printf("输入数字有误!\n");
                 break;
         }
     }
 }
 void search(struct Student stu[],int n,char Name[])
 {
     char* p= Name;
     int flag = ;
     for(int i=;i<n;i++)
     {
         if(strcmp(stu[i].name,p)==)
         {
             flag = ;
             My_print_sum(stu,i);
         }
     }
     if(flag==)
     {
         printf("the name is not exist!\n");
     }
 }
 void search1(struct Student stu[],int n,int Num)
 {
     int flag = ;
     for(int i=;i<n;i++)
     {
         if(Num==stu[i].sno)
         {
             flag = ;
             My_print_sum(stu,i);
         }
     }
     if(flag==)
     {
         printf("the sno is not exist!\n");
     }
 }
 void sort(struct Student stu[],int n)
 {
     float sum[N];
     for(int i=;i<n;i++)
     {
         sum[i]=stu[i].EnglishScore+stu[i].mathScore+stu[i].chineseScore;
     }
     for(int i=;i<n-;i++)
     {
         for(int j=;j<n--i;j++)
         {
             if(sum[j]<sum[j+])
             {
                 float temp1 = sum[j];
                 sum[j] = sum[j+];
                 sum[j+] = temp1;

                 struct Student temp;
                 temp=stu[j];
                 stu[j]=stu[j+];
                 stu[j+]=temp;
             }
         }
     }
 }
 void max_min(struct Student stu[],int n)
 {
     sort(stu,n);

     printf("成绩最优的同学:");
     My_print_sum(stu,);

     printf("成绩最差的同学:");
     My_print_sum(stu,n-);
 }

 void print(struct Student stu[],int n)
 {
     for(int i=;i<n;i++)
     {
         My_print_sum(stu,i);
     }
 }

 void My_print_sum(struct Student stu[],int n)
 {
     printf("\n姓名:%s,学号:%d,年龄:%d,性别:%c,英语:%.2f,数学:%.2f,语文: %.2f,总分:%.2f\n",
            stu[n].name,stu[n].sno,stu[n].age,stu[n].gender,
            stu[n].EnglishScore,stu[n].mathScore,stu[n].chineseScore,(stu[n].EnglishScore+stu[n].mathScore+stu[n].chineseScore));
 }