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
function isPowerOfFour ( n ) { return n != 0 && ( ( n & ( n - 1 ) ) == 0 ) && ! ( n & 0xAAAAAAAA ) ; } test_no = 64 ; if ( isPowerOfFour ( test_no ) ) document . write ( test_no + " " ) ; else document . write ( test_no + " " ) ;