Given integers A and B (A < B). Output all integers from A to B inclusive; while the number A should be displayed 1 time, the number A + 1 2 times?

Question

C++ / C#

int a12, b12, n12;
Console.Write("Введите число A -> "); a12 = Convert.ToInt32(Console.ReadLine());
Console.Write("Введите число B -> "); b12 = Convert.ToInt32(Console.ReadLine());
if (a12 < b12)
  {
     for (; a12 <= b12; a12++)
         {
            Console.WriteLine(a12);
         }
   }
else
   {
        Console.WriteLine("Ошибка: A > B.");
    }

Now it simply displays, for example ,
2
3
4
And you need
2
3
3
4
4
4

Answer 1

2. The code is as terrible as possible because of the names of the variables, line breaks, and entering variables in advance.
3. Validation is not needed, because by the condition of the problem it is guaranteed that A < B
4. You do not have enough loop to repeat the number N times