原来这就是命令行下的“学生信息管理系统”

因为不是计算机专业，一直对没被要求写过坑爹的“XXX管理系统”深表遗憾。

好吧。

机会来了。

选修课上写的，野蛮暴力。

小朋友请在家人指导下观看。

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>

/********函数声明******/

void AddStudent();  
void Search_By_name();
void Search_By_class();
void Search_By_Age();
void Search_By_class_And_age();
void Print_By_Index(int i);
void PrintHelloWord();
void clean();
void Start();

/********************/
struct Student
    {
        char name[30];
        char phone[20];
        char address[100];
        int  class_num;
        int  age;
    };
#define MaxSize 100
Student students[MaxSize];
int current_size = 0;
int main()
{
    
    
    
    
    Start();              //程序启动
    return 0;

}
void Search_By_name()   // 返回该姓名对应索引
{
  int i = 0;
  int count = 0;
  char name[100];
  printf("请输入姓名");
  scanf("%s",name);
  if(name)
  {
      for(i = 0;i < current_size;i++)
      {
          if(strcmp(students[i].name,name) == 0 )
          {
              Print_By_Index(i);
              count ++;
          }
      }
      printf("总共有%d个学生",count);
      getch();
  }

}
void Search_By_class()      //  
{
    int num = -1;
    int count = 0;
    printf("请输入班级号:");
    scanf("%d",&num);
    if(num >= 1)
    {
        int i = 0;
        for(i = 0;i < current_size;i++)
        {
            if(students[i].class_num == num)
            {
                Print_By_Index(i);
                count ++;
            }
        }
        printf("总共有%d位同学",count);
        getch();

    }
    else
        printf("输入有误");

}
void Print_By_Index(int i)     //打应索引为i的学生信息
{
    printf("姓名 = %s\n",students[i].name);
    printf("电话 = %s\n",students[i].phone);
    printf("地址 = %s\n",students[i].address);
    printf("班级 = %d\n",students[i].class_num);
    printf("年龄 = %d\n",students[i].age);
}
void Search_By_class_And_age()      //  
{
    int class_num = -1;
    int  age_min = -1;
    int  age_max = -1;
    printf("输入要查询的班级");
    scanf("%d",&class_num);
    printf("输入年龄下限");
    scanf("%d",&age_min);
    printf("输入年龄上限");
    scanf("%d",&age_max);
    if((class_num > 0) && (age_max > age_min) && (age_max > 0) && (age_min > 0))
    {
        int i = 0;
        int count = 0;
        for(i = 0;i < current_size;i++)
        {
            if(students[i].class_num == class_num && (students[i].age >= age_min && students[i].age <= age_max) )
                {
                    Print_By_Index(i);
                    count ++;
                }
        }
        printf("总共有%d个学生",count);
        getch();
    }
}

void clean()//清屏
{
    system("cls");
}
void PrintHelloWord()   // 打印界面
{
    int i = 0;
    for(;i < 80;i++)
        printf("*");
    printf("\n");

    int line = 7;
    for(i = 0;i < line;i++)
    {
        int j = 0;
        
        switch(i)
        {

            case 0:
                printf("\t\t\t%10s\n\n","本系统功能如下");
                break;
            case 1:
                printf("\t%10s\n","[a] 添加学生信息");
                break;
            case 2:
                printf("\t%10s\n","[b] 通过姓名查信息");
                break;
            case 3:
                printf("\t%10s\n","[c] 找出班级人数及名单");
                break;
            case 4:
                printf("\t%10s\n","[d] 找出某年龄段人数及名单");
                break;
            case 5:
                printf("\t%10s\n","[e] 通过班级和年龄查找学生");
                break;
            case 6:
                printf("\t%10s\n","[f] 退出                  ");
                break;
        }
        
    }
    for(;i < 87;i++)
        printf("*");
    printf("\n\n");
    printf("请输入您的选择：");



}
void AddStudent()       //添加学生
{
    if(current_size >= MaxSize - 1)
    {
        printf("名额已满");
        getch();
    }
    else
    {
        printf("请输入学生姓名：");
        scanf("%s",students[current_size].name);
        printf("请输入电话号码：");
        scanf("%s",students[current_size].phone);
        printf("请输入地址：");
        scanf("%s",students[current_size].address);
        printf("请输入班级：");
        scanf("%d",&students[current_size].class_num);
        printf("请输入年龄：");
        scanf("%d",&students[current_size].age);
        current_size++;
    }
    printf("添加成功\n");
    getch();

}
void Start()
{

    
    char c = 0;
    while(c != '#')
    {
        PrintHelloWord();
        scanf("%c",&c);
        switch(c)
        {
            // 添加学生信息
            case 'a':
                AddStudent();
                break;
            // 通过姓名查信息
            case 'b':
                Search_By_name();
                break;
            //找出班级人数及名单
            case 'c':
                Search_By_class();
                break;
            //找出某年龄段人数及名单
            case 'd':
                Search_By_Age();
                break;
            //通过班级和年龄查找学生
            case 'e':
                Search_By_class_And_age();
                break;
            case 'f':
                c = '#';
                break;
            default:
                     printf("您的输入有误\n");
                     break;
        }
        //printf("按任意键继续");
        //getch();
        clean();
    }

}
void Search_By_Age()
{
    
    int  age = -1;

    printf("输入年龄");
    scanf("%d",&age);
    if(age > 0)
    {
        int i = 0;
        int count = 0;
        for(i = 0;i < current_size;i++)
        {
            if(students[i].age == age)
            {
                    Print_By_Index(i);
                    count ++;
            }
        }
        printf("总共有%d个学生",count);
        getch();
    }
}