title: Turn Off The Rightmost Set Bit
signature: function turnOffTheRightmostSetBit($n) {
test_code: <?php
  
  
  // SOLUTION CODE 
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  function validateSolution($actual, $expected){
      return serialize($actual) == serialize($expected);
  }
  
  function driver($n, $expected){
      try{
        if (validateSolution(PLACEHOLDER_FN_NAME($n), $expected)){
          return "PASSED";
        }
        return "FAILED";
      }
      catch (Exception $exception_obj) {
        return get_class($exception_obj);
      }
  }
  
  function main(){
      printf("TEST-0...%s\n",driver(
        9, 
        8));
      
      printf("TEST-1...%s\n",driver(
        54, 
        52));
      
      printf("TEST-2...%s\n",driver(
        60, 
        56));
      
      printf("TEST-3...%s\n",driver(
        32, 
        0));
      
      printf("TEST-4...%s\n",driver(
        41, 
        40));
      
      printf("TEST-5...%s\n",driver(
        64, 
        0));
      
      printf("TEST-6...%s\n",driver(
        4, 
        0));
      
      printf("TEST-7...%s\n",driver(
        51, 
        50));
      
      printf("TEST-8...%s\n",driver(
        57, 
        56));
      
      printf("TEST-9...%s\n",driver(
        92, 
        88));
      
  }
  
  main();
  ?>
source_py: def turn_off_the_rightmost_set_bit(n):
      return (n & (n - 1))
source_cpp: int turn_off_the_rightmost_set_bit(unsigned int n) {
    return n & ( n - 1 );
  }