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  1. using namespace std; 
  2. #include<iostream>
  3.  
  4. int main()
  5. {
  6. double s=1,i; int n;
  7.  
  8. cout<<"Enter n(n=2k):";
  9. cin>>n;
  10. if(n%2>0)
  11. 	{
  12. 	cout<<"the number you entered is odd";
  13. 	cin>>n;
  14. 	}
  15. 	else
  16. 	{
  17. for(i=2;i<=n;i+=2)
  18. 	{
  19. 	s+=(i+1)/i;
  20. 	}
  21. cout<<"sum of them="<<s;
  22. 	 }
  23.  
  24. }
Success #stdin #stdout 0s 3300KB
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Enter n(n=2k):the number you entered is odd
https://ideone.com/YHU5SU
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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