Ошибка при вводе двумерного массива

#include <iostream>
#include <conio.h>
 
using namespace std;
 
const int m = 12;
const int years = 3;
 
const char * mounth[m] =
{
  "January",
  "Fabruary",
  "March",
  "April",
  "May",
  "June",
  "July",
  "August",
  "September",
  "October",
  "November",
  "December"
};
 
int main()
{
  int n = 12;
  int books[years][n];
  
  for(int i = 1; i <= years; i++)
  {
    cout << i << " year:" << endl << endl;
    
    for(int mon = 0, j = 0; mon < m, j < n; mon++, j++)
    {
      cout << mounth[mon] << " - ";
      cin >> books[i][j];
      cout << endl;
    }
    cout << endl;
  }
  
  getch();
  return 0;
}

#include <iostream>
#include <conio.h>
 
using namespace std;
 
const int Mounths = 12;
const int Years = 3;
 
int main()
{
  const char * mounths[Mounths] =
  {
    "January",
    "Fabruary",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
  };
 
  int b = 12;
  int Books[Years][b];
  
  int sum;
  for(int year = 1; year <= Years; year++)
  {
    cout << "Year " << year << ":" << endl << endl;
    for(int mounth = 0, book = 0; mounth < Mounths, book < b; mounth++, book++)
    {
      cout << mounths[mounth] << " - ";
      cin >> Books[year][book];
      sum += Books[year][book];
    }
    sum = 0;
    cout << endl << endl;
  }
  
  getch();
  return 0;
}

int b = 12;
...
...
for(int mounth = 0, book = 0; mounth < Mounths, book < b; mounth++, book++)
{
    ....
}

int sum;
...
...
sum += Books[year][book];

int year = 1

#include <iostream>
#include <conio.h>
 
using namespace std;
 
const int Mounths = 12;
const int Years = 3;
 
int main(int argc, char** argv)
{
 
    const char * mounths[Mounths] =
    {
        "January",
        "Fabruary",
        "March",
        "April",
        "May",
        "June",
        "July",
        "August",
        "September",
        "October",
        "November",
        "December"
    };
 
    int Books[Years][Mounths];
 
    int sum = 0;
    int sum_array[3];   //Массив для хранения кол-ва книг каждый год
    for(int year = 0; year < Years; year++)
    {
        cout << "Year " << year+1 << ":" << endl << endl;
        for(int mounth = 0; mounth < Mounths; mounth++)
        {
            cout << mounths[mounth] << " - ";
            cin >> Books[year][mounth];
            sum += Books[year][mounth];
        }
        sum_array[year] = sum;
        sum = 0;
        cout << endl << endl;
    }
 
    for(int i = 0; i < 3; ++i)
    {
        cout << "За " << i+1 << " год было продано " << sum_array[i] << " книг." << endl;
    }
 
    system("pause");
    return 0;
}