title: Count Set Bits In An Integer 1
signature: int countSetBitsInAnInteger1(int n) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(int actual, int expected){
      return actual == expected;
  }
  
  string driver(int n, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(n), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver(43, 4); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver(94, 5); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver(72, 2); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver(86, 4); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver(42, 3); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver(33, 2); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver(8, 1); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver(74, 3); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver(29, 4); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver(34, 2); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
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 );
  }