title: Count Set Bits In An Integer 1
signature: function count_set_bits_in_an_integer_1(n)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(n, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(n) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver(43, 4)
      print(string.format("TEST-0...%s",result))
  
      result = driver(94, 5)
      print(string.format("TEST-1...%s",result))
  
      result = driver(72, 2)
      print(string.format("TEST-2...%s",result))
  
      result = driver(86, 4)
      print(string.format("TEST-3...%s",result))
  
      result = driver(42, 3)
      print(string.format("TEST-4...%s",result))
  
      result = driver(33, 2)
      print(string.format("TEST-5...%s",result))
  
      result = driver(8, 1)
      print(string.format("TEST-6...%s",result))
  
      result = driver(74, 3)
      print(string.format("TEST-7...%s",result))
  
      result = driver(29, 4)
      print(string.format("TEST-8...%s",result))
  
      result = driver(34, 2)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def count_set_bits_in_an_integer_1(n):
      if (n == 0):
          return 0
      else:
          return ((n & 1) + count_set_bits_in_an_integer_1((n >> 1)))
source_cpp: int count_set_bits_in_an_integer_1(int n) {
    if ( n == 0 ) return 0;
    else return ( n & 1 ) + count_set_bits_in_an_integer_1 ( n >> 1 );
  }