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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. // returns true if n is power of four
  5. bool checkPowerof4(unsigned n)
  6. {
  7. 	// return true if n is power of 2 and its only
  8. 	// set bit is present at even position
  9. 	return n && !(n & (n - 1)) && !(n & 0xAAAAAAAA);
  10. }
  11.  
  12. int main() 
  13. {
  14. 	unsigned n = 256;
  15.  
  16. 	if (checkPowerof4(n))
  17. 		cout << n << " is power of 4";
  18. 	else 
  19. 		cout << n << " is not a power of 4";
  20.  
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
stdout
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256 is power of 4
https://ideone.com/mWZQZc
Check if number is power of four or not
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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