Segmentation fault (core dumped) - C++ - Ответ 4258884

#include <stdio.h>
#include <iostream>
 
using namespace std;
 
struct Data {
  unsigned int day;
  unsigned int month;
  unsigned int year;
};
 
class List{
  public:
    Data *data;
    List *next;
};
 
List *begin;
List *current;
 
class inout{
  public:
    int ch;
    inout();
    void input();
    void output();
    ~inout();
};
 
 
inout::inout() {
begin=NULL;
ch=0;
while(ch!=1) input();
output();
};
 
void inout::input() {
  cout<<"enter data"<<endl;
  current=new List;
  if(begin==NULL) current=new List;
    else {current->next=new List; current=current->next;}
  current->next=NULL;
  cin>>current->data->day;
  cin>>current->data->month;
  cin>>current->data->year;
  if(begin==NULL) begin=current;
  cout<<"To finish entering data, press 1";
  cin>>ch;
 
};
 
void inout::output() {
  current=begin;
  do {
    cout<<current->data->day<<".";
    cout<<current->data->month<<".";
    cout<<current->data->year;
    cout<<endl;
    current=current->next;
  } while (current!=NULL);
};
 
inout::~inout(){
  while(begin){
    current=begin;
    begin=current->next;
    delete current;
  }
  delete begin;
};
 
int main () {
  inout obj;
  return 0;
}