title: Find Position Given Number Among Numbers Made 4 7
signature: int findPositionGivenNumberAmongNumbersMade47(string 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(string 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("7", 2); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver("305745689", 5); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver("444", 7); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver("4", 1); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver("2074", 5); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver("27", 2); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver("447", 8); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver("255", 0); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver("10000111111011", 0); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver("fAKcSDRTNz", 0); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def find_position_given_number_among_numbers_made_4_7(n):
      i = 0
      j = len(n)
      pos = 0
      while (i < j):
          if (n[i] == '4'):
              pos = ((pos * 2) + 1)
          if (n[i] == '7'):
              pos = ((pos * 2) + 2)
          i = (i + 1)
      return pos
source_cpp: int find_position_given_number_among_numbers_made_4_7(string n) {
    int i = 0, pos = 0;
    while ( n [ i ] != '\0' ) {
      switch ( n [ i ] ) {
        case '4' : pos = pos * 2 + 1;
        break;
        case '7' : pos = pos * 2 + 2;
        break;
      }
      i ++;
    }
    return pos;
  }