title: Count Set Bits In An Integer
signature: function countSetBitsInAnInteger($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(
        58, 
        4));
      
      printf("TEST-1...%s\n",driver(
        92, 
        4));
      
      printf("TEST-2...%s\n",driver(
        73, 
        3));
      
      printf("TEST-3...%s\n",driver(
        52, 
        3));
      
      printf("TEST-4...%s\n",driver(
        24, 
        2));
      
      printf("TEST-5...%s\n",driver(
        14, 
        3));
      
      printf("TEST-6...%s\n",driver(
        58, 
        4));
      
      printf("TEST-7...%s\n",driver(
        11, 
        3));
      
      printf("TEST-8...%s\n",driver(
        8, 
        1));
      
      printf("TEST-9...%s\n",driver(
        52, 
        3));
      
  }
  
  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;
  }