Find the number inside the digit

Rhino Developer
1

Good evening everyone,
I’m writing a simple C++ loop that compares a sample number such as the number 3 within a digit ranging from 1 to 42.
Thanks in advance for your help.

2

Hi @massimo.grieco,

Is this different than just writing a for loop and comparing values?

Perhaps some more detail might be helpful?

– Dale

3

Hi Dale, thank you for your reply and I was hoping for your help. Sorry but I’m new to this language and I can’t formulate the code. I would like the loop to return the corresponding digits which contain the number 3. I would be grateful for an example.

4

Hi @massimo.grieco,

Consider a function such as this:

/// <summary>
/// Returns true if a value contains a digit.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="digit">The digit.</param>
/// <returns>True if the value contains the digit.</returns>
static bool ContainsDigit(
  unsigned int value, 
  unsigned int digit
)
{
  while (value > 0)
  {
    if (value % 10 == digit)
      return true;
    value /= 10;
  }
  return false;
}

Here is a simple test command:

CRhinoCommand::result CCommandTestDigits::RunCommand(
  const CRhinoCommandContext& context
)
{
  ON_RandomNumberGenerator rnd;
  rnd.Seed();

  const int count = 100;
  ON_SimpleArray<unsigned int> values(count);
  for (int i = 0; i < count; i++)
    values.Append(rnd.RandomUnsignedInteger(0, 1000));

  const int digit = 3;
  for (int i = 0; i < count; i++)
  {
    if (ContainsDigit(values[i], digit))
      RhinoApp().Print(L"%u\n", values[i]);
  }

  return CRhinoCommand::success;
}

– Dale

5

Thanks a lot for the support, Dale.