title: Fast Multiplication Method Without Using Multiplication Operator Russian Peasants Algorithm
signature: class Solution {
  
      public int FastMultiplicationMethodWithoutUsingMultiplicationOperatorRussianPeasantsAlgorithm(int a, int b) {
test_code: using System;
  using System.Numerics;
  using System.Diagnostics;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Security.Cryptography;
  using System.Web.UI;
  using System.Web.Script.Serialization;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  namespace EvaluatePrediction {
      class TestRunner {
          public bool ValidateSolution(int actual, int expected){
              return new JavaScriptSerializer().Serialize(actual) == new JavaScriptSerializer().Serialize(expected);
          }
  
          public string driver(int a, int b, int expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(a, b); 
                if (ValidateSolution(
                      pred_result,
                      expected)){
                  return "PASSED";
                }
                return "FAILED";
              } 
              catch (Exception exception_obj)
              {
                return exception_obj.GetType().FullName;
              }
          }
          static void Main(string[] args) {
              TestRunner runner = new TestRunner();
              String result;
              result = runner.driver(
                  4, 33, 
                  132
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  36, 67, 
                  2412
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  65, 52, 
                  3380
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  55, 37, 
                  2035
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  35, 76, 
                  2660
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  69, 98, 
                  6762
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  84, 62, 
                  5208
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  5, 80, 
                  400
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  15, 36, 
                  540
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  67, 84, 
                  5628
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def fast_multiplication_method_without_using_multiplication_operator_russian_peasants_algorithm(a, b):
      res = 0
      while (b > 0):
          if (b & 1):
              res = (res + a)
          a = (a << 1)
          b = (b >> 1)
      return res
source_cpp: unsigned int fast_multiplication_method_without_using_multiplication_operator_russian_peasants_algorithm(unsigned int a, unsigned int b) {
    int res = 0;
    while ( b > 0 ) {
      if ( b & 1 ) res = res + a;
      a = a << 1;
      b = b >> 1;
    }
    return res;
  }