<awangdev>O(1) Check Power of 2_1.java
public boolean checkPowerOf2(int n) {
        if (n <= 0) {
            return false;
        }
        return (n & (n - 1)) == 0;
    }
public boolean var_0 ( int var_1 ) {
  if ( var_1 <= 0 ) {
    return false ;
  }
  return ( var_1 & ( var_1 - 1 ) ) == 0 ;
}
