title: Find Whether A Given Number Is A Power Of 4 Or Not 2
signature: class Solution {
  
      public Boolean findWhetherAGivenNumberIsAPowerOf4OrNot2(Integer n) {
source_py: def find_whether_a_given_number_is_a_power_of_4_or_not_2(n):
      return ((n != 0) and ((n & (n - 1)) == 0) and (not (n & 2863311530)))
source_cpp: bool find_whether_a_given_number_is_a_power_of_4_or_not_2(unsigned int n) {
    return n != 0 && ( ( n & ( n - 1 ) ) == 0 ) && ! ( n & 0xAAAAAAAA );
  }
question_info.extension: java
question_info.entry_fn_name: findWhetherAGivenNumberIsAPowerOf4OrNot2
question_info.entry_cls_name: Solution
question_info.test_list: [{"idx": 0, "outputs": true, "inputs": {"n": 1}}, {"idx": 1, "outputs": true, "inputs": {"n": 4}}, {"idx": 2, "outputs": true, "inputs": {"n": 64}}, {"idx": 3, "outputs": false, "inputs": {"n": -64}}, {"idx": 4, "outputs": false, "inputs": {"n": 128}}, {"idx": 5, "outputs": true, "inputs": {"n": 1024}}, {"idx": 6, "outputs": false, "inputs": {"n": 97}}, {"idx": 7, "outputs": false, "inputs": {"n": 86}}, {"idx": 8, "outputs": false, "inputs": {"n": 14}}, {"idx": 9, "outputs": false, "inputs": {"n": 99}}]
question_info.test_code: import static java.util.Map.entry;  
  import java.util.*;
  import java.lang.*;
  // TESTING CODE 
  // ============================================
  class QuestionEvaluator {
      public static String validateSolution(Integer n, Boolean expected){
          try{
              Driver driver = new Driver();
              if (driver.run(n,expected)){
                  return "PASSED";
              }
              return "FAILED";
              
          } catch (Exception exception_obj){
              return exception_obj.getClass().getSimpleName();
          }
  
      }
      public static void main(String[] args) {
          String result;
          result = validateSolution(1, true);
          System.out.println(String.format("%s%s","TEST-0...",result));    
      
          result = validateSolution(4, true);
          System.out.println(String.format("%s%s","TEST-1...",result));    
      
          result = validateSolution(64, true);
          System.out.println(String.format("%s%s","TEST-2...",result));    
      
          result = validateSolution(-64, false);
          System.out.println(String.format("%s%s","TEST-3...",result));    
      
          result = validateSolution(128, false);
          System.out.println(String.format("%s%s","TEST-4...",result));    
      
          result = validateSolution(1024, true);
          System.out.println(String.format("%s%s","TEST-5...",result));    
      
          result = validateSolution(97, false);
          System.out.println(String.format("%s%s","TEST-6...",result));    
      
          result = validateSolution(86, false);
          System.out.println(String.format("%s%s","TEST-7...",result));    
      
          result = validateSolution(14, false);
          System.out.println(String.format("%s%s","TEST-8...",result));    
      
          result = validateSolution(99, false);
          System.out.println(String.format("%s%s","TEST-9...",result));    
      
      }
  }
  
  class Driver{
      public boolean run(Integer n, Boolean expected){
  
          PLACEHOLDER_CLS_NAME sol = new PLACEHOLDER_CLS_NAME();
          return validateSolution(sol.PLACEHOLDER_FN_NAME(n),expected);
      }
      
      public boolean validateSolution(Boolean actual, Boolean expected){
          return actual.equals(expected);
      }
  }
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
question_info.test_case_ids: 0 1 2 3 4 5 6 7 8 9
question_info.commands: java __FILENAME__