Find whether a given number is a power of 4 or not | C ++ program to check if given number is power of 4 or not ; Driver code
#include <bits/stdc++.h> NEW_LINE using namespace std ; bool isPowerOfFour ( unsigned int n ) { return n != 0 && ( ( n & ( n - 1 ) ) == 0 ) && ! ( n & 0xAAAAAAAA ) ; } int main ( ) { int test_no = 64 ; if ( isPowerOfFour ( test_no ) ) cout << test_no << " ▁ is ▁ a ▁ power ▁ of ▁ 4" ; else cout << test_no << " ▁ is ▁ not ▁ a ▁ power ▁ of ▁ 4" ; }