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  1. #include <string>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <climits>
  5. #include <limits>
  6.  
  7.  
  8. std::string tostr(unsigned long x)
  9. {
  10.   // this will mask out the lower "byte" of the number
  11.   const unsigned char mask = std::numeric_limits<unsigned char>::max();
  12.  
  13.   if (x == 0)
  14.     return std::string("0");
  15.  
  16.   std::string res;
  17.   for (; x > 0; x >>= CHAR_BIT) {
  18.     res += (char) (x & mask);
  19.   }
  20.  
  21.   std::reverse(res.begin(), res.end());
  22.   return res;
  23. }
  24.  
  25.  
  26. int main()
  27. {
  28.   const size_t MAX = sizeof(unsigned long);
  29.  
  30.   std::string s("abcd");
  31.   // std::string s("\226\226\226\226");
  32.   unsigned long res = 0;
  33.  
  34.   for (size_t i=0; i < std::min(MAX, s.size()); ++i)
  35.   {
  36.     res <<= CHAR_BIT;
  37.     res += (unsigned char) s[i];
  38.   }
  39.  
  40.   std::cout << std::hex << res << std::endl;
  41.  
  42.   std::cout << tostr(res) << std::endl;
  43. }
  44.  
Success #stdin #stdout 0s 2856KB
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Standard input is empty
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61626364
abcd
https://ideone.com/Cw7hF
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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