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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool is_lucky(int num)
  5. {
  6. 	int digit = 0;
  7. 	while (num > 0)
  8. 	{
  9. 		digit = num % 10;
  10. 		num /= 10;
  11. 		if(digit != 4 && digit != 7)
  12. 			return false;
  13. 	}
  14. 	return true;
  15. }
  16.  
  17. int main()
  18. {
  19. 	int a, b; cin >> a >> b;
  20. 	int flag = 0;
  21. 	for (int i = a; i <= b; i++)
  22. 	{
  23. 		if(is_lucky(i))
  24. 		{
  25. 			cout << i << " ";
  26. 			flag++;
  27. 		}
  28. 	}
  29. 	if(flag == 0) cout << -1; 
  30. 	return 0;
  31. }
Success #stdin #stdout 0.01s 5252KB
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4 20
stdout
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https://ideone.com/kYGljS
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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