C语言实现学生成绩管理系统项目

本文实例为大家分享了c语言实现学生成绩管理系统项目，供大家参考，具体内容如下

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 rerved.// 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 50struct student{  char name[20];  int sno;  int age;  char gender;  float englishscore;  float mathsco品质意识培训资料re;  float chinescore;}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 arch(struct student stu[],int n,char name[]);//按姓名查询void arch1(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("plea lect 0-1:");}//查找子菜单void ekscreen(){  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("plea you lect 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("plea press enter_key continue!\n");  getchar();  printf("plea lect 0-4:");  char c = getchar();  switch(c)  {    ca '1':       printf("plea student'numbers you want to add:");       scanf("%d",&nums);       add(stu,count,nums);   //添加数据       getchar();       break;    ca '2':       deletescreen();       scanf("%d",&temp);       switch(temp)       {         ca 0:           printf("plea input delete name:");           scanf("%s",names);;           delete_name(stu,names); //删除数据(按姓名删除)           break;         ca 1:           printf("plea input delete sno:");           scanf("%d",&snos);           delete_sno(stu,snos); //删除数据(按学号删除)           break;         ca 2:           break;       }       getchar();       break;    ca '3':       menu(stu,count);//查找数据       getchar();    甜甜的 周杰伦   break;    ca '4':       printf("plea input update sno:");       scanf("%d",&snos);       update(stu,snos,count);   //修改数据       break;    ca '0':       exit(0);          //退出系统    default:       printf("data is illeagel!\n");       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("plea input name:");    scanf("%s",stu[i].name);    int flag = 1,sno;    while(flag)    {     printf("plea input sno:");     scanf("%d",&sno);      for(int j=0;j<pos;j++)      {        if(stu[j].sno==sno)        {          printf("sno is exist!\n");          break;        }        el        {          flag = 0;        }      }      stu[i].sno = sno;    }    printf("plea input age:");    scanf("%d",&stu[i].age);    printf("plea input gender:(f/m or f/m)");    getchar();    scanf("%c",&stu[i].gender);    printf("plea input englishscore:");    scanf("%f",&stu[i].englishscore);    printf("plea input mathscore:");    scanf("%f",&stu[i].mathscore);    printf("plea input chine南京大专score:");    scanf("%f",&stu[i].chinescore);    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==0)  {    printf("成员已为空!\n");    return;  }  int flag=0;  for(int i=0;尊老爱老敬老i<count;i++)  {    if((stu+i)->sno==sno)    {      for(int j=i;j<count;j++)      {        *(stu+j)=*(stu+j+1);      }      printf("\n");      printf("学号为%d的学生已被删除\n",sno);      printf("\n");      flag=1;      count = count-1;      break;    }  }  if(flag==0)    printf("学号%d不存在.\n",sno);}//按姓名删除void delete_name(struct student *stu,char name[]){  if(count==0)  {    心态正能量printf("成员已为空!\n");    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("\n");      printf("学生:%s 已被删除.\n",name);      printf("\n");      flag=flag+1;      count =count -1;    }  }  if(flag==0)    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[20];  int grade,i;  for(i=0; i<len; i++)  {    if(sno==stu[i].sno)    {      printf("plea ask update name?(y/n):");      getchar();      cs = getchar();      if(cs == 'y')      {        printf("plea input a new name:");        scanf("%s",p);        getchar();        strcpy(stu[i].name,p);        printf("update is succeed!\n");      }      printf("plea ask update englishscore?(y/n):");      cs1 = getchar();      if(cs1 == 'y')      {        printf("plea input a new grade:");        scanf("%d",&grade);        stu[i].englishscore = grade;        printf("update is succeed!\n");      }      printf("plea ask update mathscore?(y/n):");      getchar();      cs2 = getchar();      if(cs2 == 'y')      {        printf("plea input a new grade:");        scanf("%d",&grade);        stu[i].mathscore = grade;        printf("update is succeed!\n");      }      printf("plea ask update chinescore?(y/n):");      getchar();      cs3 = getchar();      if(cs3 == 'y')      {        printf("plea input a new grade:");        scanf("%d",&grade);        stu[i].chinescore = grade;        printf("update is succeed!\n");        break;      }      el      {        getchar();        break;      }    }    el if(i==len-1)    {      printf("error,don't have the sno!");      break;    }    el    {      continue;    }  }}//查询数据void menu(struct student stu[],int m){  int logel = 1;  while(logel)  {    ekscreen();    int n;    scanf("%d",&n);    char name[20];    int num;    switch(n)    {      ca 1 :        printf("请输入同学的姓名: ");        scanf("%s",name);        arch(stu,count,name);        break;      ca 2 :        printf("\n请输入同学的学号: ");        scanf("%d",&num);        arch1(stu,count,num);        break;      ca 3:        print(stu,count);        break;      ca 4:        sort(stu,count);        print(stu,count);        break;      ca 5:        max_min(stu,count);        break;      ca 6:        logel = 0;        break;      default:        logel = 0;        printf("输入数字有误!\n");        break;    }  }}void arch(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!\n");  }}void arch1(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!\n");  }}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].chinescore;  }  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("\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].chinescore,(stu[n].englishscore+stu[n].mathscore+stu[n].chinescore));}

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