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Text File  |  1987-10-04  |  256 b   |  9 lines
  1. /*
  2. ** return 'true' if c is alphanumeric
  3. */
  4. isalnum(c) int c; {
  5.   return ((c<='z' && c>='a') ||
  6.           (c<='Z' && c>='A') ||
  7.           (c<='9' && c>='0'));
  8.   }
  9.