技術標籤：筆記

#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];//最多新增4個學生
void choice();
void dell();
void xiugai();
void baocun();
 

void display()
{

	cout << "-----------------------學生管理選單----------------------\n";
	cout << "1 新增學生" << "   " << "2 刪除學生  3 查詢學生資訊  4修改資訊 5儲存 6退出" << endl;
}
void init()
{
	//初始化函式
	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 << "剩餘" << k << "個記錄可以新增\n";
	cout << "請輸入你要新增的學生個數;\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 << "請輸入第" << i + 1 << "個學生學號 姓名 性別(用m表示男 w表示女）年齡" << 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 << "該學號不能新增" << endl;
							display();
						}

					}
					if (stu[h].sex != 'w' && stu[h].sex != 'm')
					{
						stu[h].sex = '\0';
						cout << "性別輸入錯誤\n";
							display();
					}
					if (stu[h].age < 1 || stu[h].age >100)
					{
						stu[h].sex = '\0';
						cout << "年齡輸入錯誤" << endl;
					}
					break;
				}
			}
			cout << "\n學生新增成功\n";

		}
	display();
	choice();
}
void dell()
{
	//刪除功能
	int id,count=0;
	cout << "您想刪除的學生學號:\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 << "刪除成功" << endl;
			break;
		
			
		}
	}
		if (count == 0)
		{
			cout << "該學號不存在\n";
			
		}
		display();
		choice();
}


	void inqui() 
	{
		int id , count = 0;
		cout << "您想查詢的學生學號(輸入0檢視所有學生）:\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 << "不存在這個學號的學生！\n";
		}
			display();
			choice();
	}
	void xiugai()
	{
		int count = 0;
		cout << "您想修改的學生學號:\n";
		int id;
		cin >> id;
		int i;
		for (i = 0; i < maxx; i++)
		{
			if (stu[i].idnum == id)
			{
				count++;
				cout << "您要修改的學生資訊:";
				cout << stu[i].idnum << " " << stu[i].name << "  " << stu[i].sex << " " << stu[i].age << " \n";
				cout << "請重新輸入資訊 按學號 姓名 性別 年齡輸入;\n";
				cin >> stu[i].idnum >> stu[i].name >> stu[i].sex >> stu[i].age;
				cout << "已經修改";
			
				break;
			}
		}
		if (count == 0)
			cout << "該學號不存在!\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 << "資訊已經儲存\n";
		fclose(mysfile);
		display();
		choice();
	}

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

	}

	void choice()
	{
		int a;
		cout << "請選擇功能:\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 << "輸入選擇有錯誤！\n";
				break;
			}
		}
	}

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


	}