C / C++ / MFC

awesometrickycool wrote:

...I need to be able to tell whether they are valid or not (1,000,000 = Valid, 1000,000 = Invalid)

awesometrickycool wrote:

Sorry if this is a bit confusing.

inline
bool IsNumber(TCHAR ch)
{ return ch >= '0' && ch <= '9'; }

bool ParseVal(LPCTSTR& pStr, float& val)
{
  val = 0.0f;

  bool isNegative = false;

  if (*pStr == '+')
  {
    pStr++;
  }
  else if (*pStr == '-')
  {
    pStr++;
    isNegative = true;
  }

  if (!IsNumber(*pStr))
    return false;

  bool firstSegment = true;
  int count = 0;
  while (*pStr)
  {
    TCHAR ch = *pStr++;
    // you could use a switch, but it wouldn't be much faster and breaking
    // out of the while loop is a pain
    if (ch == 'E' || ch == ' ')
    {
      break;
    }
    else if (ch == ',' || ch == '.') // should check for localized value [you could cache a static value)
    {
      if (firstSegment)
      {
        firstSegment = false;

        if (count > 3)
          return false;
      }
      else
      {
        if (count != 3)
          return false;
      }
      count == 0;
    }
    else if (IsNumber(ch))
    {
      if (++count > 3)
        return false;

      // you could also start calculating the value here
    }
    else
    {
      return false;
    }
  }
  return true;
}

#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

int main(int argc, char *argv[])
{
    string str(argv[1]);
    int count = 0;
    int i = 0;
    if((str[0] == '-')||(str[0] == '+'))
    {
        count = -1;
    }
    bool firstSegment = true;
    while((count < 4)&&(i < str.size()))
    {
        if((str[i] == 'E' )||(str[i] == 'e')||(str[i] == '.'))
        {
            if((count == 3)||(firstSegment == true))
            {
                i = (str.size() - 1);
            }
            else if(firstSegment == false)
            {
                cout << "X" << endl;
                count = 3;
                i = (str.size() - 1);
            }
        }
        else if(str[i] == ',')
        {
            if(firstSegment == true)
            {
                firstSegment = false;
                if((count > 3)||(count == 0))
                {
                    count = 4;
                }
                else
                {
                    str.erase(i,1);
                    count = 0;
                    i--;
                }
            }
            else
            {
                if(count != 3)
                {
                    count = 4;
                }
                else
                {
                    str.erase(i,1);
                    count = 0;
                    i--;
                }
            }
        }
        else
        {
            count++;
        }
        i++;
    }
    if((count!=3)&&(firstSegment == false))
    {
        cout << "Y" << endl;
    }
    cout << str << endl;
    return 0;
}