12. Transform algoritm example

• 
      #include <iostream>
      #include <cstdlib> // for rand() and srand()
      #include <ctime>
      #include <algorithm>
      #include <iterator> // for std::ostream_iterator
  
      // frand returns pseudo-random numbers 0 to 9:
      int frand( int ) { return rand() % 10; }
  
      int main()
      {
          srand( (unsigned)time( 0 ) );
          const int SIZE = 5;
          int dummy[ SIZE ];
  
          // Populate array dummy with random numbers:
          std::transform(
              dummy,
              dummy + SIZE,
              dummy,
              frand
              );
  
          // Display elements of dummy:
          std::copy(
              dummy,
              dummy + SIZE,
              std::ostream_iterator< int >( std::cout, "\t" )
              );
  
          return 0;
      }
      /* Program output:
      5       8       7       9       7
      */