#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<fstream>
#include<conio.h>
using namespace std;
const int maxx = 4;
struct student {
    
    
	int idnum;
	char name[40];
	char sex;
	int age;
}stu[maxx];//最多添加4个学生
void choice();
void dell();
void xiugai();
void baocun();
void display()
{
    
    

	cout << "-----------------------学生管理菜单----------------------\n";
	cout << "1 添加学生" << "   " << "2 删除学生  3 查询学生信息  4修改信息 5保存 6退出" << endl;
}
void init()
{
    
    
	//初始化函数
	for (int i = 0; i < maxx; i++)
	{
    
    
		stu[i].name[40] = '\0';
		stu[i].sex = '\0';
		stu[i].age = 0;
	}
}
void add()
{
    
    
	int k = 0, j;
	for (int i = 0; i < maxx; i++)
	{
    
    
		if (stu[i].sex == '\0') k++;
	}
	cout << "剩余" << k << "个记录可以添加\n";
	cout << "请输入你要添加的学生个数;\n";
	cin >> j;
	if (j > k) {
    
    
		cout << "error number";
		cout << endl;
		display();
		choice();
	}
	else
		for (int i = 0; i < j; i++)
		{
    
    
			for (int h = 0; h < maxx; h++) 
			{
    
    
				if (stu[h].sex == '\0')
				{
    
    
					cout << "请输入第" << i + 1 << "个学生学号 姓名 性别(用m表示男 w表示女）年龄" << endl;
					cin >> stu[h].idnum >> stu[h].name >> stu[h].sex >> stu[h].age;
					for (int g = 0; g < maxx; g++)
					{
    
    
						if (stu[g].idnum == stu[h].idnum && g != h)
						{
    
    
							cout << "该学号不能添加" << endl;
							display();
						}

					}
					if (stu[h].sex != 'w' && stu[h].sex != 'm')
					{
    
    
						stu[h].sex = '\0';
						cout << "性别输入错误\n";
							display();
					}
					if (stu[h].age < 1 || stu[h].age >100)
					{
    
    
						stu[h].sex = '\0';
						cout << "年龄输入错误" << endl;
					}
					break;
				}
			}
			cout << "\n学生添加成功\n";

		}
	display();
	choice();
}
void dell()
{
    
    
	//删除功能
	int id,count=0;
	cout << "您想删除的学生学号:\n";
	cin >> id;
	for (int i = 0; i < maxx; i++)
	{
    
    
		if (stu[i].idnum == id)
		{
    
    
			count++;
			stu[i].idnum = -1;
			stu[i].name[40] = '\0';
			stu[i].sex = '\0';
			stu[i].age = 0;
			cout << "删除成功" << endl;
			break;
		
			
		}
	}
		if (count == 0)
		{
    
    
			cout << "该学号不存在\n";
			
		}
		display();
		choice();
}


	void inqui() 
	{
    
    
		int id , count = 0;
		cout << "您想查询的学生学号(输入0查看所有学生）:\n";
		cin >> id;
		if (id == 0)
		{
    
    
			for (int i = 0; i < maxx; i++)
			{
    
    
				if (stu[i].sex != '\0')
					cout << stu[i].idnum << " " << stu[i].name << "  " << stu[i].sex << " " << stu[i].age << " \n";
			}
		}
		else {
    
    
			for (int i = 0; i < maxx; i++)
			{
    
    
				if (stu[i].idnum == id)
				{
    
    
					count++;
					cout << stu[i].idnum << " " << stu[i].name << "  " << stu[i].sex << " " << stu[i].age << " ";
				}
			}
			if (count == 0)
				cout << "不存在这个学号的学生！\n";
		}
			display();
			choice();
	}
	void xiugai()
	{
    
    
		int count = 0;
		cout << "您想修改的学生学号:\n";
		int id;
		cin >> id;
		int i;
		for (i = 0; i < maxx; i++)
		{
    
    
			if (stu[i].idnum == id)
			{
    
    
				count++;
				cout << "您要修改的学生信息:";
				cout << stu[i].idnum << " " << stu[i].name << "  " << stu[i].sex << " " << stu[i].age << " \n";
				cout << "请重新输入信息 按学号 姓名 性别 年龄输入;\n";
				cin >> stu[i].idnum >> stu[i].name >> stu[i].sex >> stu[i].age;
				cout << "已经修改";
			
				break;
			}
		}
		if (count == 0)
			cout << "该学号不存在!\n"; \
		display();
		choice();
	}
	void baocun()
	{
    
    

		FILE* mysfile = NULL;
		mysfile = fopen("ooo.txt", "r");
		for (int i = 0; i < maxx; i++) {
    
    
			fscanf(mysfile, "%d", &stu[i].idnum);
			fscanf(mysfile, "%s",stu[i].name);
			fscanf(mysfile, "%s", stu[i].sex);
			fscanf(mysfile, "%d", stu[i].age);
			
		}
		cout << "信息已经保存\n";
		fclose(mysfile);
		display();
		choice();
	}

	void exit()
	{
    
    
		system("cls");
		exit(1);

	}

	void choice()
	{
    
    
		int a;
		cout << "请选择功能:\n";
		cin >> a;
		if (a == 1 || a == 2 || a == 3 || a == 4)
		{
    
    
			switch (a)
			{
    
    
			case 1:add();
			case 2: dell(); break;
			case 3:inqui(); break;
			case 4:xiugai(); break;
			case 5:baocun(); break;
			case 6:exit(); break;
			default:
				cout << "输入选择有错误！\n";
				break;
			}
		}
	}

	int main()
	{
    
    
		init();
		display();
		choice();


	}