title: Count Set Bits In An Integer
signature: function count_set_bits_in_an_integer(n)
test_code: using Printf
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  function validate_solution(actual, expected)
      return actual == expected
  end
  
  function driver(n, expected)
      try
  
          if validate_solution(PLACEHOLDER_FN_NAME(n), expected)
              return "PASSED";
          end
          return "FAILED";
      catch exception_obj
          return string(Base.typename(typeof(exception_obj)).wrapper);
      end
  end
  
  function main()
      
      result = driver(58, 4);
      @printf("TEST-0...%s\n",result);
      
      result = driver(92, 4);
      @printf("TEST-1...%s\n",result);
      
      result = driver(73, 3);
      @printf("TEST-2...%s\n",result);
      
      result = driver(52, 3);
      @printf("TEST-3...%s\n",result);
      
      result = driver(24, 2);
      @printf("TEST-4...%s\n",result);
      
      result = driver(14, 3);
      @printf("TEST-5...%s\n",result);
      
      result = driver(58, 4);
      @printf("TEST-6...%s\n",result);
      
      result = driver(11, 3);
      @printf("TEST-7...%s\n",result);
      
      result = driver(8, 1);
      @printf("TEST-8...%s\n",result);
      
      result = driver(52, 3);
      @printf("TEST-9...%s\n",result);
      
  end
  
  main()
source_py: def count_set_bits_in_an_integer(n):
      count = 0
      while n:
          count += (n & 1)
          n >>= 1
      return count
source_cpp: unsigned int count_set_bits_in_an_integer(unsigned int n) {
    unsigned int count = 0;
    while ( n ) {
      count += n & 1;
      n >>= 1;
    }
    return count;
  }