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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. bool isPow2(int v) {
  5. 	return v != 0 && v == (1 << __builtin_ctz(v));
  6. }
  7.  
  8. int main() {
  9. 	cout << isPow2(0) << endl;
  10. 	cout << isPow2(1) << endl;
  11. 	cout << isPow2(2) << endl;
  12. 	cout << isPow2(3) << endl;
  13. 	cout << isPow2(4) << endl;
  14. 	cout << isPow2(5) << endl;
  15. 	cout << isPow2(6) << endl;
  16. 	cout << isPow2(7) << endl;
  17. 	cout << isPow2(8) << endl;
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 4332KB
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https://ideone.com/gDWSDK
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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