c++ 学籍管理系统v 1.0

#include<iostream>
#include <string>
#include<conio.h>
using namespace std;
class sj
{public :
int year,month,day;
void shuru()
{cin>>year>>month>>day;
}
};
class student
{
public :
	string xm,kc[5];
	int bj,xh,cj[5];
	sj time;
	void sr()
	{cout<<"请输入学号";
		cin>>xh;
		 system("cls");
		cout<<"请输入姓名";
		cin>>xm;
		 system("cls");
		 cout<<"请输入入学日期中间用空格隔开";
		 time.shuru();
		  system("cls") ;
		cout<<"请输入班级";
		cin>>bj;
		 system("cls");
		 cout<<"请输入课程（5门）中间用空格隔开";
		for(int i=0;i<5;i++)
			cin>>kc[i];
		  system("cls");
		  }
	void shuruchengji()
	{int i;
		for(i=1;i<6;i++)
		{
			cout<<"请输入"<<kc[i]<<"的成绩";
			cin>>cj[i];
		}
	}
};
string mima()
{cout<<"请设置密码:";
string mm1,mm2;
char ch;
 while ((ch=_getch())!=13)
 {
  mm1+=ch;
  cout<<"*";
 }
 	 cout<<endl;
cout<<"请再次确认密码:";
while ((ch=_getch())!=13)
 {
  mm2+=ch;
  cout<<"*";
 }
	 system("cls");
if(mm1==mm2)
return mm1;
else
mima();
}
int denglu(string mm)
{
	cout<<"请输入登陆密码：";
	string mm1;
	char ch;
 while ((ch=_getch())!=13)
 {
  mm1+=ch;
  cout<<"*";
 }	 system("cls");
	if(mm==mm1)
		return 1;
	else
	{cout<<"密码错误，您还有两次机会，请重试";
     while ((ch=_getch())!=13)
 {
  mm1+=ch;
  cout<<"*";
 }
	 	 system("cls");
	 if(mm==mm1)
		return 1;
	else
	{cout<<"密码错误，您还有一次机会，请重试";
     while ((ch=_getch())!=13)
 {
  mm1+=ch;
  cout<<"*";
 }
	 	 system("cls");
	 if(mm==mm1)
		return 1;
	else
	{cout<<"密码错误，请明天再试";
	return 0;}
	}
	}
}
	int main()
	{int n,i;
	string mm;
	student stu[500];
	mm=mima();
	i=denglu(mm);
	if(i)
	{	cout<<"请输入学生人数: ";
	cin>>n;
		 system("cls");
	for(i=0;i<n;i++)
		stu[i].sr();
	int a;
	//	while(cin>>a)

	}
return 0;
	}