using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace student
{
public struct Student
{
public string Names;
public double Src;
public string Id;
}
class Program
{
public static Student[] students = new Student[20];//全局数组
static void Main(string[] args)
{
int choes = 0;
do
{
Console.WriteLine("************************************学生管理************************************");
Console.WriteLine("1:注册学生信息 2:修改学生信息 3:查询学生信息 4:查询最高成绩/最低成绩 0:退出");
Console.WriteLine("********************************************************************************");
Console.WriteLine("请输入功能序号:");
choes = int.Parse(Console.ReadLine());
switch (choes)
{
case 1:
int count = 0;
Console.WriteLine("请输入学生姓名:");
students[count].Names = Console.ReadLine();
Console.WriteLine("请输入学生成绩:");
students[count].Src = double.Parse(Console.ReadLine());
students[count].Id = "2021" + new Random().Next(10,100).ToString();
Console.WriteLine("学号:{0},姓名:{1},成绩:{2},注册成功!", students[count].Id, students[count].Names, students[count].Src);
count++;
break;
case 2:
Console.WriteLine("输入修改学生的学号:");
string id2 = Console.ReadLine();
bool flag1 = true;
for (int i = 0; i <students.Length; i++)
{
if (id2==students[i].Id)
{
flag1 = false;
Console.WriteLine("输入新的成绩:");
students[i].Src = double.Parse(Console.ReadLine());
Console.WriteLine("修改成功! 学号:{0},姓名:{1},成绩:{2}",id2,students[i].Names, students[i].Src);
}
}
if (flag1)
{
Console.WriteLine("学号输入错误");
}
break;
case 3:
Console.WriteLine("请输入学生姓名:");
string name3 = Console.ReadLine();
Console.WriteLine("请输入学生学号:");
string id3 = Console.ReadLine();
bool flag3 = true;
for (int i = 0; i < students.Length; i++)
{
if (name3== students[i].Names&&id3== students[i].Id)
{
flag3 = false;
Console.WriteLine("学号:{0},姓名:{1},成绩:{2}", id3, students[i].Names, students[i].Src);
}
}
if (flag3)
{
Console.WriteLine("姓名或学号不正确");
}
break;
case 4:
Student max = students[0];
Student min = students[0];
for (int i = 0; i <students.Length; i++)
{
if (students[i].Src>max.Src)
{
max = students[i];
}
if (students[i].Src<min.Src)
{
min = students[i];
}
}
Console.WriteLine("最大值:{0}最小值{1}",max.Src,min.Src);
break;
case 0:
Console.WriteLine("欢迎下次使用,再见!");
break;
case 5:
foreach (Student item in students)
{
if (item.Names!=null)
{
Console.WriteLine("姓名\t成绩\t学号");
Console.WriteLine(item.Names + "\t" + item.Src + "\t" + item.Id);
}
}
break;
default:
Console.WriteLine("该功能不存在");
break;
}
} while (choes!=0);
}
}
}