Handout - string function - find first period in a string

//PRE:  str[] contains a null-terminated string
//POST: The function returns the index of the first occuurrence of
//      '.' in str[].  If str[] contains no '.', the function returns -1

int PositionOfPeriod (const char str[])
{
  int i=0;
  int position = -1;  // return -1 if period not found

  while (str[i] != '\0')
  {
    if (str[i] == '.')
        return i;
    i++;
  }

  return position;
}