C++ Why doesn't counter work?

Question

C++ / C#

I'm learning C++ from scratch. I came up with a multiplication table for myself using switch, for and if.

The goal was to show two options. 1 User number. 2. The whole multiplication table.
The second option would like to do with spaces between every 10 lines using if. But counter refuses to pass. I know that you can skip a line with cout << endl; Why counter doesn't work?

#include <iostream>

using namespace std;

int main() {

  int a = 1, b = 2, c = 3, d = 4, e = 5, f = 6, g = 7, h = 8, i = 9, j = 10;
  int my; // Число пользователя
  char x; // Выбор для switch
  int y; // Для for
  int counter;
  counter = 0;

  setlocale(LC_ALL, "Rus");

  cout << "Это таблица умножения." << endl;
  cout << "Выберите условие." << endl;
  cout << "1. Умножить свое число." << endl;
  cout << "2. Показать таблицу умножения." << endl;

  cin >> x;

  switch (x) {
  case '1':
    cout << "Введите Ваше число" << endl;
    cin >> my;
    cout << "\n" << endl;
    for (y = 0; y <= 10; y++)
      cout << y << " * " << my << " = " << y * my << endl;
  
    break;
  case '2': {
    
      for (y = 0; y <= 10; y++) 
        cout << a << " * " << y << " = " << a * y << endl;
      for (y = 0; y <= 10; y++)
        cout << b << " * " << y << " = " << b * y << endl;
      for (y = 0; y <= 10; y++)
        cout << c << " * " << y << " = " << c * y << endl;
      for (y = 0; y <= 10; y++)
        cout << d << " * " << y << " = " << d * y << endl;
      for (y = 0; y <= 10; y++)
        cout << e << " * " << y << " = " << e * y << endl;
      for (y = 0; y <= 10; y++)
        cout << f << " * " << y << " = " << f * y << endl;
      for (y = 0; y <= 10; y++)
        cout << g << " * " << y << " = " << g * y << endl;
      for (y = 0; y <= 10; y++)
        cout << h << " * " << y << " = " << h * y << endl;
      for (y = 0; y <= 10; y++) 
        cout << i << " * " << y << " = " << i * y << endl;
      for (y = 0; y <= 10; y++) 
        cout << j << " * " << y << " = " << j * y << endl;
        counter++;
      
        


        if (counter == 10){
          cout << "\n";
          counter = 0;
        }
        
    }
    break;
    
    


    
  
  default:
    cout << "Вы ввели неверное условие" << endl;

  }

  return 0;

}

Answer 1

Create a body for it:
for (y = 0; y <= 10; y++) {
cout << j << " * " << y << " = " << j * y << endl;
counter++;
}