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Jan 30th, 2015
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C++ 0.28 KB | None | 0 0
  1. int DemChuSo(int n)
  2. {
  3.     int chuso=1;
  4.     while(n)
  5.     {
  6.         ++chuso;
  7.         n/=10;
  8.     }
  9.     return chuso;
  10. }
  11. int TongCacChuSo(int n)
  12. {
  13.     int tong=0;
  14.     while(n)
  15.     {
  16.         tong+=n%10;
  17.         n/=10;
  18.     }
  19.     return tong;
  20. }
  21. int ChuSoDauTien(int n)
  22. {
  23.     if(n<0) n*=-1;
  24.     while(n>9)
  25.         n/=10
  26.     return n;
  27. }
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