public bool CheckSubstructionInside(string s)
{
Dictionary <char, int> roman_numbers = GetRomanNumbers();
int count_substruction = 0;
int previous_value = 0;
int current_value = 0;
for (int i = s.Length - 1; i >= 0; i--)
{
current_value = roman_numbers[s[i]];
if (current_value < previous_value)
{
if (Math.Truncate(Math.Log(current_value, 10)) != Math.Log(current_value, 10))
{
messanger?.ShowError("is not a power of 10");
return(false);
}
if (previous_value != current_value * 10 &&
current_value / 10 * 5 != previous_value / 10)
{
messanger?.ShowError("does not correspond to a number series");
return(false);
}
count_substruction++;
}
else if (current_value == previous_value && count_substruction > 0)
{
messanger?.ShowError("the number of subtractions exceeded");
return(false);
}
else
{
count_substruction = 0;
}
previous_value = current_value;
}
return(true);
}
