title: Even Fibonacci Numbers Sum
signature: even_fibonacci_numbers_sum <- function(limit) {
test_code: 
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  validate_solution <- function(actual, expected) {
      toString(actual)==toString(expected)
  }
  
  driver <- function(limit, expected){
      if (validate_solution(PLACEHOLDER_FN_NAME(limit), expected)){
          "PASSED"
      } else{
          "FAILED"
      }
  }
  
  main <- function() {
      cat(sprintf("TEST-0...%s\n",driver(
          67L, 
          44L
      )))
  
      cat(sprintf("TEST-1...%s\n",driver(
          89L, 
          44L
      )))
  
      cat(sprintf("TEST-2...%s\n",driver(
          12L, 
          10L
      )))
  
      cat(sprintf("TEST-3...%s\n",driver(
          94L, 
          44L
      )))
  
      cat(sprintf("TEST-4...%s\n",driver(
          96L, 
          44L
      )))
  
      cat(sprintf("TEST-5...%s\n",driver(
          25L, 
          10L
      )))
  
      cat(sprintf("TEST-6...%s\n",driver(
          49L, 
          44L
      )))
  
      cat(sprintf("TEST-7...%s\n",driver(
          8L, 
          10L
      )))
  
      cat(sprintf("TEST-8...%s\n",driver(
          33L, 
          10L
      )))
  
      cat(sprintf("TEST-9...%s\n",driver(
          59L, 
          44L
      )))
  
  }
  
  main()
source_py: def even_fibonacci_numbers_sum(limit):
      if (limit < 2):
          return 0
      ef1 = 0
      ef2 = 2
      sm = (ef1 + ef2)
      while (ef2 <= limit):
          ef3 = ((4 * ef2) + ef1)
          if (ef3 > limit):
              break
          ef1 = ef2
          ef2 = ef3
          sm = (sm + ef2)
      return sm
source_cpp: int even_fibonacci_numbers_sum(int limit) {
    if ( limit < 2 ) return 0;
    long long int ef1 = 0, ef2 = 2;
    long long int sum = ef1 + ef2;
    while ( ef2 <= limit ) {
      long long int ef3 = 4 * ef2 + ef1;
      if ( ef3 > limit ) break;
      ef1 = ef2;
      ef2 = ef3;
      sum += ef2;
    }
    return sum;
  }