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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4. #include <cstring>
  5. #include <string>
  6. #include <algorithm>
  7. #include <iterator>
  8.  
  9. int main()
  10. {
  11.     // the hard, inefficient way
  12.     {
  13.         enum { N = 7, M = 13 } ;
  14.         char dest[N][M] = { "zero", "one", "two", "three", "four", "five", "six" } ;
  15.  
  16.         std::srand( std::time(nullptr) ) ;
  17.  
  18.         for( int i = N-1 ; i > 0 ; --i ) // fisher yates shuffle
  19.         {
  20.             const int pos = std::rand() % (i+1) ;
  21.             char temp[M] ;
  22.             std::strcpy( temp, dest[pos] ) ;
  23.             std::strcpy( dest[pos], dest[i] ) ;
  24.             std::strcpy( dest[i], temp ) ;
  25.         }
  26.  
  27.         for( const char* cstr : dest ) std::cout << cstr << ' ' ;
  28.         std::cout << '\n' ;
  29.     }
  30.  
  31.     // the simple, efficient way
  32.     {
  33.         enum { N = 7 } ;
  34.         std::string dest[N] = { "zero", "one", "two", "three", "four", "five", "six" } ;
  35.  
  36.         std::srand( std::time(nullptr) ) ; // if it has not already been done
  37.  
  38.         std::random_shuffle( std::begin(dest), std::end(dest) ) ;
  39.  
  40.         for( const std::string& str : dest ) std::cout << str << ' ' ;
  41.         std::cout << '\n' ;
  42.     }
  43. }
  44.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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three five two four one six zero 
four zero six three two five one
https://ideone.com/3MTUkq
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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