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Text File  |  1984-09-28  |  122 b   |  10 lines
  1. /*    return true if input character is a digit
  2. */
  3.  
  4. isdigit(c)
  5. unsigned char c;
  6. {
  7.  
  8.   return ('0'<=c && c<='9');
  9. }
  10.