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  1. #include <iostream>
  2. #include <ctime>
  3. #include <cstdlib>
  4. #include <algorithm> // std::random_shuffle
  5. #include <iterator> // std::begin, std::end
  6.  
  7. int main()
  8. {
  9.     const int N = 5 ;
  10. 	std::srand( std::time(0) ) ;
  11.  
  12.     // the actual results are the five numbers at the beginning of the array
  13. 	int lottoresults[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 } ;
  14.  
  15. 	// generate 5 non-repeating numbers for lottoresults by
  16. 	// generating a random permutation of the elements in the array
  17. 	// and then picking the first five
  18. 	// see: http://e...content-available-to-author-only...e.com/w/cpp/algorithm/random_shuffle
  19. 	std::random_shuffle( std::begin(lottoresults), std::end(lottoresults) ) ;
  20.  
  21. 	// or: std::random_shuffle( lottoresults, lottoresults+10 ) ; // legacy C++
  22.  
  23. 	// print them out
  24. 	std::cout << "lotto winning numbers: " ;
  25. 	for( int i = 0 ; i < N ; ++i ) std::cout << lottoresults[i] << ' ' ;
  26.     std::cout << '\n' ;
  27.  
  28.     // numbers entered by the user
  29.     int userinput[N] = { 5, 9, 0, 8, 1 } ; // say, as an examplew
  30. 	std::cout << "user input: " ;
  31. 	for( int i = 0 ; i < N ; ++i ) std::cout << userinput[i] << ' ' ;
  32.     std::cout << '\n' ;
  33.  
  34.     // check for matching numbers
  35.     int cnt_matches = 0 ; // #matches
  36.  
  37.     std::cout << "matching numbers: " ;
  38.     for( int i = 0 ; i < N ; ++i ) // for each number entered by the user
  39.     {
  40.         const int user_num = userinput[i] ;
  41.  
  42.         // check if the number number entered by the user is a winning number
  43.         // (could use std::find() instead of writing a loop of out own)
  44.         for( int j = 0 ; j < N ; ++j ) // for each winning number
  45.         {
  46.             if( user_num == lottoresults[j] ) // is it the same as user_num?
  47.             {
  48.                 // yes, we got a match
  49.                 ++cnt_matches ;
  50.                 std::cout << user_num << ' ' ;
  51.             }
  52.         }
  53.     }
  54.  
  55.     std::cout << "\nnumber of matches: " << cnt_matches << '\n' ;
  56. }
  57.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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lotto winning numbers: 3 2 8 4 0 
user input: 5 9 0 8 1 
matching numbers: 0 8 
number of matches: 2
https://ideone.com/UX3cEZ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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