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  1. #include <map>
  2. #include <string>
  3. #include <sstream>
  4. #include <iomanip>
  5. #include <iostream>
  6.  
  7. int main()
  8. {
  9.     std::map< unsigned char, char > look_up ;
  10.  
  11.     // populate the map with data from the stream containing the table
  12.     {
  13.         std::istringstream stream( "61=M \n 62=N \n 63=O \n 64=P \n 65=Q \n" ) ;
  14.         std::string byte ;
  15.         char separator ;
  16.         char data ;
  17.         while( stream >> std::setw(2) >> byte >> separator >> data && separator == '=' )
  18.         {
  19.             // look_up[ std::stoi(byte,nullptr,16) ] = data ;
  20.  
  21.             std::istringstream stm(byte) ;
  22.             int key ;
  23.             stm >> std::hex >> key ;
  24.             look_up[key] = data ;
  25.         }
  26.     }
  27.  
  28.     // use the map to translate the input data
  29.     {
  30.         std::istringstream stm( "abcdexedcbayaedbc" ) ;
  31.         unsigned char byte ;
  32.         while( stm >> byte )
  33.         {
  34.             auto p = look_up.find(byte) ;
  35.             if( p != look_up.end() ) std::cout << p->second ;
  36.             else std::cout << char(byte) ; // lookup failed
  37.         }
  38.     }
  39. }
  40.  
Success #stdin #stdout 0s 3036KB
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stdin
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Standard input is empty
stdout
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MNOPQxQPONMyMQPNO
https://ideone.com/5pZGBF
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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