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C/C++ Source or Header  |  1994-11-16  |  1.3 KB  |  57 lines
  1. /*******************************************************************************
  2. +
  3. +  LEDA  3.1c
  4. +
  5. +
  6. +  _Int.c
  7. +
  8. +
  9. +  Copyright (c) 1994  by  Max-Planck-Institut fuer Informatik
  10. +  Im Stadtwald, 6600 Saarbruecken, FRG     
  11. +  All rights reserved.
  12. + 
  13. *******************************************************************************/
  14.  
  15.  
  16. /*         Int.cc             */
  17.  
  18. /**************************************************************************
  19.     Aufbau der Int arithmetic in C++,
  20.  
  21.     RD, IWR Uni Heidelberg, 14.12.90
  22. *****************************************************************************/
  23.  
  24.  
  25. #include <LEDA/Int0.h>
  26. #include <ctype.h>
  27.  
  28.  
  29. ostream& operator<<(ostream &out, const Int &a)
  30.     {     int l=Ilog(a)+1;
  31.         char *s=new char[l/3+2];
  32.         Itoa(a, s);
  33.         out<<s;
  34.         delete s;
  35.         return out;
  36.     }
  37.  
  38. istream& operator>>(istream &in, Int &a)
  39.     {    char s[IN_INT_BUF_LENGTH];
  40.                 char* p = s;
  41.                 char c;
  42.                 do {
  43.                   in.get(c);
  44.                   if ((c == '+') || (c == '-')) { *p++ = c; }
  45.                 } while (isspace(c) || (c == '+') || (c == '-'));
  46.                 if (!isdigit(c)) { error_handler(1,"digit expected"); }
  47.                 while (isdigit(c)) {
  48.                   *p++ = c;
  49.                   in.get(c);
  50.                 }
  51.                 in.putback(c);
  52.                 *p = '\0';
  53.         atoI(s, a);
  54.         return in;
  55.     }
  56.  
  57.