/* Determine if a particular character is a digital character */
int isdchar(int c)
/* Determine if a particular character is a digital character */
int isdchar(int c)
{
  return ((('0' <= (c)) && ((c) <= '9')) ||
          (c == 'e') || (c == 'E') ||
          (c == '+') || (c == '-') ||
          (c == '.'));
}