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  1. #include <sstream>
  2. #include <string>
  3. #include <bitset>
  4. #include <iostream>
  5. #include <iomanip>
  6.  
  7. int main()
  8. {
  9.     const std::string test[] = { "...|N|Y|N|N|...", "...|Y|N|Y|N|...", "...|N|Y|Y|N|..." } ;
  10.  
  11.     for( const std::string& str : test )
  12.     {
  13.         std::istringstream stm(str) ;
  14.  
  15.         // parse the four Y/N into bool values
  16.         // and form a bitset of four bits with with 'Y' == 1
  17.  
  18.         constexpr std::size_t NBITS = 4 ;
  19.         std::bitset<NBITS> bits ; // set of four bits
  20.         char Y_or_N ;
  21.         for( std::size_t i = 0 ; i < NBITS ; ++i )
  22.         {
  23.             stm.ignore( 100, '|' ) ; // throw characters away upto and including the next '|'
  24.             stm >> Y_or_N ; // read the next char ('Y' or 'N')
  25.             bits[ (NBITS-1) - i ] = Y_or_N == 'Y' ; // set the corrosponding bit to 1 if it is a 'Y'
  26.         }
  27.  
  28.         // get the code by converting the bits to an integral value
  29.         auto code = bits.to_ulong() ;
  30.  
  31.         // check it out
  32.         std::cout << str << "  " << bits << "  " << std::setw(2) << std::setfill('0') << code << '\n' ;
  33.     }
  34. }
  35.  
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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...|N|Y|N|N|...  0100  04
...|Y|N|Y|N|...  1010  10
...|N|Y|Y|N|...  0110  06
https://ideone.com/fAl0JZ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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