title: Count Set Bits In An Integer 3
signature: function countSetBitsInAnInteger3($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(
        6, 
        2));
      
      printf("TEST-1...%s\n",driver(
        58, 
        4));
      
      printf("TEST-2...%s\n",driver(
        90, 
        4));
      
      printf("TEST-3...%s\n",driver(
        69, 
        3));
      
      printf("TEST-4...%s\n",driver(
        15, 
        4));
      
      printf("TEST-5...%s\n",driver(
        54, 
        4));
      
      printf("TEST-6...%s\n",driver(
        60, 
        4));
      
      printf("TEST-7...%s\n",driver(
        51, 
        4));
      
      printf("TEST-8...%s\n",driver(
        46, 
        4));
      
      printf("TEST-9...%s\n",driver(
        91, 
        5));
      
  }
  
  main();
  ?>
source_py: def count_set_bits_in_an_integer_3(n):
      if (n == 0):
          return 0
      else:
          return (1 + count_set_bits_in_an_integer_3((n & (n - 1))))
source_cpp: int count_set_bits_in_an_integer_3(int n) {
    if ( n == 0 ) return 0;
    else return 1 + count_set_bits_in_an_integer_3 ( n & ( n - 1 ) );
  }