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Text File  |  1985-04-01  |  256 b   |  12 lines
  1.  
  2. /*
  3. ** return "true" if c is alphanumeric
  4. */
  5. isalnum(c) int c; {
  6.   return ((c<='z' && c>='a') ||
  7.           (c<='Z' && c>='A') ||
  8.           (c<='9' && c>='0'));
  9.   }
  10.  
  11.  
  12.