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#include<iostream>
#include<vector>
#include<windows.h>
using namespace std;
int a=999;
int b=0;
bool c=false;
struct student{
	string name;
	int age;
	int card;
	int grade;
}s;
void ka(){
	cout<<"学生管理系统:"<<endl;
	cout<<"1.新建学生信息"<<endl;
	cout<<"2.查找学生信息"<<endl;
	cout<<"3.修改学生信息"<<endl;
	cout<<"4.删除学生信息"<<endl;
	cout<<"5.退出系统"<<endl;
}
vector<student> insert(vector<student> v){
	cout<<"请输入学生姓名:";
	cin>>s.name;
	cout<<"请输入学生年龄:";
	cin>>s.age;
	cout<<"请输入学生年级:";
	cin>>s.grade;
	cout<<"你的学号是:";
	a++;
	s.card=a;
	cout<<s.card;
	v.push_back(s);
	Sleep(500);
	return v;
}
vector<student> find(vector<student> v){
	while(1){
		cout<<"你要用什么形式查找:"<<endl;
		cout<<"1.学生卡号"<<endl;
		cout<<"2.学生年龄"<<endl;
		cout<<"3.学生姓名"<<endl;
		cout<<"4.退出"<<endl;
		cin>>b;
		if(b==4){
			break;
		}
		switch(b){
		case 1:{
			cin>>b;
			for(int i=0;i<v.size();i++){
				if(v[i].card==b){
					cout<<"学生姓名:";
					cout<<v[i].name<<endl;
					cout<<"请输入学生年龄:";
					cout<<v[i].age<<endl;
					cout<<"请输入学生年级:";
					cout<<v[i].grade<<endl;
					Sleep(2000);
					c=true;
				}
			}
		if(c==false){
			cout<<"没找到";
			Sleep(500);
		}
		break;
		}
		
		
		case 2:{
			cin>>b;
			for(int i=0;i<v.size();i++){
				if(v[i].age==b){
					cout<<"学生姓名:";
					cout<<v[i].name<<endl;
					cout<<"请输入学生年龄:";
					cout<<v[i].age<<endl;
					cout<<"请输入学生年级:";
					cout<<v[i].grade<<endl;
					Sleep(2000);
					c=true;
					}
				}
			if(c==false){
				cout<<"没找到";
				Sleep(500);			
				}
			break;
			}
		case 3:{
		string d;
		cin>>d;
		for(int i=0;i<v.size();i++){
			if(v[i].name.find(d)!=string::npos){
				cout<<"学生姓名:";
				cout<<v[i].name<<endl;
				cout<<"请输入学生年龄:";
				cout<<v[i].age<<endl;
				cout<<"请输入学生年级:";
				cout<<v[i].grade<<endl;
				Sleep(2000);
				c=true;
			}
		}
		if(c==false){
			cout<<"没找到";
			Sleep(500);
		}
		break;
		}
		 
		default :{
		 
		break;
		}
		}
		system("cls");
}
 
	return v;
}
vector<student> change(vector<student> v){
	for(int i=0;i<v.size();i++){
		if(v[i].card==b){
		while(1){
			c=true;
			cout<<"你要修改什么:"<<endl;
			cout<<"1.学生姓名"<<endl;
			cout<<"2.学生年龄"<<endl;
			cout<<"3.学生年级"<<endl;
			cout<<"4.退出"<<endl;
			cin>>b;
			if(b==4){
				break;
			}
		switch(b){
			case 1:{
				cout<<v[i].name<<endl;
				cin>>v[i].name;
				break;
			}
			case 2:{
				cout<<v[i].age<<endl;
				cin>>v[i].age;
				break;
			}
			case 3:{
				cout<<v[i].grade<<endl;
				cin>>v[i].grade;
				break;
			}
		default:{
			
			
		break;
		}
		}
		system("cls");
		}
	 
	}
	}
	if(c==false){
		cout<<"没找到";
		Sleep(500);
	}
	 
	 
	return v;
}
int main(){
	vector<student> v;
	while(1){
		ka();
		int n;
		cin>>n;
		if(n==5){
			break;
		}
	switch(n){
		case 1:{
			v=insert(v);
			break;
		}
		case 2:{
			find(v);
			break;
		}
		case 3:{
			cout<<"请输入学生卡号:";
			cin>>b;
			change(v);
			break;
		}
		case 4:{ 
			break;
		}
	}
		system("cls");
	}
	 
	return 0;
 
}