Im trying to write the data to the file but it is storing junk values and displaying junk values!

//define class student
class student{
public:
int n,nosub;
char day[10];
char subject[10],classtime[10],classroom[10],startdate[10],enddate[10];
//create or add new entries
public:
void getdata()
{
//input from user
int n,nosub;
char day[10];
char subject[10],classtime[10],classroom[10],startdate[10],enddate[10];
//user will enter the number of days
cout<<"enter the number of days: "<<endl;
cin>>n;
for(int i =0; i<n; i++){
cout<<="" "day="<<endl;
cin>>day;
{
  cout<<" enter="" the="" number="" of="" subjects="<<endl;
  cin>>nosub;
for(int j =0; j<nosub; j++){
cout<<" \nenter="" subject="" :="" ";
cin="">>subject[j];
cout<<"\n classtime  :  ";
cin>>classtime[j];
cout<<"\n classroom  :  ";
cin>>classroom[j];
cout<<"\n startdate :  ";
cin>>startdate[j];
cout<<"\n enddate:  ";
cin>>enddate[j];
}
}}}
};
student stu;
//displaying the data from the file this can be used for display
void display()
 {
  //opening the file in read mode
  ifstream myfile("student1.txt");
  //vector declaration
  vector<string>v;
  string p;
  //read the next line from the file till it reaches the end
  while(getline(myfile,p))
  {
  v.push_back(p);
}
//display the content of the file
copy(v.begin(),v.end(),ostream_iterator<string>(cout,"\n"));
 }
int main()
{
//decalre objects from class student
student stu;
bool quit=true;

system("CLS");
int option;
cout<<"ADD DATA"<<endl;
cout<<"display"<<endl;
cout<<"quit"<<endl;
cout<<"enter the="" choice"<<endl;
cin="">>option;
switch (option){
case 1:
{
//opening file in write mode
char day[10];
char subject[10],classtime[10],classroom[10],startdate[10],enddate[10];
fstream myfile;
myfile.open("student1.txt",ios::in|ios::out);
if(!myfile)
{
cout<<"file not created";

}
else
{
//calling the function
stu.getdata();
//writing into the file
myfile<