title: Sum Series 23 45 67 89 Upto N Terms
signature: function sum_series_23_45_67_89_upto_n_terms(n)
test_code: using Printf
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  function validate_solution(actual, expected)
      return abs(actual - expected) < 1e-09
  end
  
  function driver(n, expected)
      try
  
          if validate_solution(PLACEHOLDER_FN_NAME(n), expected)
              return "PASSED";
          end
          return "FAILED";
      catch exception_obj
          return string(Base.typename(typeof(exception_obj)).wrapper);
      end
  end
  
  function main()
      
      result = driver(49, 0.7803986631477524);
      @printf("TEST-0...%s\n",result);
      
      result = driver(4, -0.16507936507936516);
      @printf("TEST-1...%s\n",result);
      
      result = driver(60, -0.21050375120783382);
      @printf("TEST-2...%s\n",result);
      
      result = driver(90, -0.21185466678122022);
      @printf("TEST-3...%s\n",result);
      
      result = driver(96, -0.2120245854859959);
      @printf("TEST-4...%s\n",result);
      
      result = driver(29, 0.7770671416747363);
      @printf("TEST-5...%s\n",result);
      
      result = driver(86, -0.21172836828074082);
      @printf("TEST-6...%s\n",result);
      
      result = driver(47, 0.780190394898247);
      @printf("TEST-7...%s\n",result);
      
      result = driver(77, 0.7821931668684383);
      @printf("TEST-8...%s\n",result);
      
      result = driver(87, 0.7825573460049735);
      @printf("TEST-9...%s\n",result);
      
  end
  
  main()
source_py: def sum_series_23_45_67_89_upto_n_terms(n):
      i = 1
      res = 0.0
      sign = True
      while (n > 0):
          n = (n - 1)
          if sign:
              sign = False
              res = (res + ((i + 1) / (i + 2)))
              i = (i + 2)
          else:
              sign = True
              res = (res - ((i + 1) / (i + 2)))
              i = (i + 2)
      return res
source_cpp: double sum_series_23_45_67_89_upto_n_terms(int n) {
    int i = 1;
    double res = 0.0;
    bool sign = true;
    while ( n > 0 ) {
      n --;
      if ( sign ) {
        sign = ! sign;
        res = res + ( double ) ++ i / ++ i;
      }
      else {
        sign = ! sign;
        res = res - ( double ) ++ i / ++ i;
      }
    }
    return res;
  }