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[20];
    int sno;
    int age;
    char gender;
    float EnglishScore;
    float mathScore;
    float chineseScore;
}stu[N]={{"zhao",1000,20,'M',98,99,97},
         {"zhao",1001,21,'F',97,96,95},
         {"qian",1002,23,'M',95,96,92},
         {"hong",1003,22,'F',91,93,97},
         {"zhou",1004,25,'M',90,90,90},
         {"feng",1005,21,'F',96,93,96},
         {"wang",1006,23,'M',97,91,90},
         {"chen",1007,21,'F',94,92,91},
         {"geng",1008,20,'F',90,99,91},
         {"tang",1009,24,'M',99,99,99}};

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

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

//查找子菜单
void seekScreen()
{
    printf("-------------------------
");
    printf("****** 1.按姓名查找信息    *
");
    printf("****** 2.按学号查找信息    *
");
    printf("****** 3.查看所有学生成绩  *
");
    printf("****** 4.成绩名次排序(总分)*
");
    printf("****** 5.查看成绩最优最差  *
");
    printf("****** 6.返回主菜单       *
");
    printf("-------------------------
");
    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 = 10;




//主函数
int main(int argc, const char * argv[])
{
 int nums,temp;
 int snos;
 char names[20];
 while(1)
 {
    PrintScreen();
    printf("please press enter_key continue!
");
    getchar();
    printf("please select 0-4:");
    char c = getchar();
    switch(c)
    {
        case '1':
              printf("please student'numbers you want to add:");
              scanf("%d",&nums);
              add(stu,count,nums);      //添加数据
              getchar();
              break;
        case '2':
              deleteScreen();
              scanf("%d",&temp);
              switch(temp)
              {
                  case 0:
                      printf("please input delete name:");
                      scanf("%s",names);;
                      Delete_name(stu,names);  //删除数据(按姓名删除)
                      break;
                  case 1:
                      printf("please input delete sno:");
                      scanf("%d",&snos);
                      Delete_sno(stu,snos); //删除数据(按学号删除)
                      break;
                  case 2:
                      break;
              }
              getchar();
              break;
        case '3':
              menu(stu,count);//查找数据
              getchar();
              break;
        case '4':
              printf("please input update sno:");
              scanf("%d",&snos);
              update(stu,snos,count);     //修改数据
              break;
        case '0':
              exit(0);                    //退出系统
        default:
              printf("data is illeagel!
");
              getchar();
              break;                      //输入非法
    }
 }
 return 0;
}



//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 = 1,sno;
        while(flag)
        {
          printf("please input sno:");
          scanf("%d",&sno);
            for(int j=0;j<pos;j++)
            {
                if(stu[j].sno==sno)
                {
                    printf("sno is exist!
");
                    break;
                }
                else
                {
                    flag = 0;
                }
            }
            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!
");
    }
    count = count + nums;
}

//按学号删除
void Delete_sno(struct Student *stu,int Sno)
{
    if(count==0)
    {
        printf("成员已为空!
");
        return;
    }
    int flag=0;
    for(int i=0;i<count;i++)
    {
        if((stu+i)->sno==Sno)
        {
            for(int j=i;j<count;j++)
            {
                *(stu+j)=*(stu+j+1);
            }
            printf("
");
            printf("学号为%d的学生已被删除
",Sno);
            printf("
");
            flag=1;
            count = count-1;
            break;
        }
    }
    if(flag==0)
        printf("学号%d不存在.
",Sno);
}

//按姓名删除
void Delete_name(struct Student *stu,char Name[])
{
    if(count==0)
    {
        printf("成员已为空!
");
        return;
    }
    int flag=0;
    int n=count;
    for(int i=0;i<n;i++)
    {
        if(strcmp((stu+i-flag)->name,Name)==0)
        {
            for(int j=i-flag;j<count;j++)
            {
                *(stu+j)=*(stu+j+1);
            }
            printf("
");
            printf("学生:%s 已被删除.
",Name);
            printf("
");
            flag=flag+1;
            count =count -1;
        }
    }
    if(flag==0)
        printf("学生:%s 不存在.
",Name);
}

//修改数据
void update(struct Student stu[],int sno,int len)
{
    char cs,cs1,cs2,cs3;
    char p[20];
    int grade,i;
    for(i=0; 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!
");
            }
            
            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!
");
            }
 
            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!
");
            }

            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!
");
                break;
            }
            else
            {
                getchar();
                break;
            }
        }
        else if(i==len-1)
        {
            printf("error,don't have the sno!");
            break;
        }
        else
        {
            continue;
        }
    }
}

//查询数据
void menu(struct Student stu[],int m)
{
    int logel = 1;
    while(logel)
    {
        seekScreen();
        int n;
        scanf("%d",&n);
        char name[20];
        int num;
        switch(n)
        {
            case 1 :
                printf("请输入同学的姓名: ");
                scanf("%s",name);
                search(stu,count,name);
                break;
            case 2 :
                printf("
请输入同学的学号: ");
                scanf("%d",&num);
                search1(stu,count,num);
                break;
            case 3:
                print(stu,count);
                break;
            case 4:
                sort(stu,count);
                print(stu,count);
                break;
            case 5:
                max_min(stu,count);
                break;
            case 6:
                logel = 0;
                break;
            default:
                logel = 0;
                printf("输入数字有误!
");
                break;
        }
    }
}
void search(struct Student stu[],int n,char Name[])
{
    char* p= Name;
    int flag = 0;
    for(int i=0;i<n;i++)
    {
        if(strcmp(stu[i].name,p)==0)
        {
            flag = 1;
            My_print_sum(stu,i);
        }
    }
    if(flag==0)
    {
        printf("the name is not exist!
");
    }
}
void search1(struct Student stu[],int n,int Num)
{
    int flag = 0;
    for(int i=0;i<n;i++)
    {
        if(Num==stu[i].sno)
        {
            flag = 1;
            My_print_sum(stu,i);
        }
    }
    if(flag==0)
    {
        printf("the sno is not exist!
");
    }
}
void sort(struct Student stu[],int n)
{
    float sum[N];
    for(int i=0;i<n;i++)
    {
        sum[i]=stu[i].EnglishScore+stu[i].mathScore+stu[i].chineseScore;
    }
    for(int i=0;i<n-1;i++)
    {
        for(int j=0;j<n-1-i;j++)
        {
            if(sum[j]<sum[j+1])
            {
                float temp1 = sum[j];
                sum[j] = sum[j+1];
                sum[j+1] = temp1;
                
                struct Student temp;
                temp=stu[j];
                stu[j]=stu[j+1];
                stu[j+1]=temp;
            }
        }
    }
}
void max_min(struct Student stu[],int n)
{
    sort(stu,n);

    printf("成绩最优的同学:");
    My_print_sum(stu,0);
    
    printf("成绩最差的同学:");
    My_print_sum(stu,n-1);
}

void print(struct Student stu[],int n)
{
    for(int i=0;i<n;i++)
    {
        My_print_sum(stu,i);
    }
}

void My_print_sum(struct Student stu[],int n)
{
    printf("
姓名:%s,学号:%d,年龄:%d,性别:%c,英语:%.2f,数学:%.2f,语文: %.2f,总分:%.2f
",
           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));
}