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  1. #include<iostream>
  2. #include<math.h>
  3. using namespace std;
  4. int main()
  5. {
  6.  
  7. 	int i,n,k,flag=1;
  8. 	cout << "Enter a number:" << endl;
  9. 	cin >> n;
  10. 	if(n==1)
  11. 	{
  12. 		cout << "Not a mersenne number" << endl;
  13. 		return 0;
  14. 	}
  15.  
  16. 	n=n+1;
  17. 	while(n>0)
  18. 	{
  19. 		if(n==1)
  20. 			break;
  21. 		if(n%2 != 0)
  22. 		{
  23. 			flag = 0;
  24. 			break;
  25. 		}
  26. 		else
  27. 			n=n/2;
  28. 	}
  29. 	if(flag==1)
  30. 		cout << "Mersenne number" << endl;
  31. 	else
  32. 		cout << "Not a mersenne number" << endl;
  33.  
  34. return 0;
  35. }
Success #stdin #stdout 0s 4472KB
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stdout
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Enter a number:
Mersenne number
https://ideone.com/EYfokB
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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