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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.     unsigned long long int n;
  7.     cin>>n;
  8.     int one=0;
  9.  
  10.     while(n > 0) {
  11.     if(n%2==1) 
  12.        ++one;    
  13.     n=n/2;
  14.     }
  15.  
  16.     if(one==1)
  17.       cout<<" number is power of 2"<<endl;
  18.     else cout<<" number is not power of 2"<<endl;
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 2732KB
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 number is power of 2
https://ideone.com/P2pnOu
language:
C++ 4.3.2 (gcc-4.3.2)
created:
9 years ago
visibility:
public

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