private CalcRequestModel Validate(CalcRequestModel request)
{
if (!_config.AllowNegativeNumbers && request.Numbers.Any(num => num < 0))
{
throw new NegativeNumberException();
}
request.Numbers = request.Numbers.Where(num => num <= _config.MaximumNumber).ToList();
return(request);
}
public static string FormatClean(this CalcRequestModel request)
{
StringBuilder sb = new StringBuilder();
sb.Append(request.Numbers[0].ToString());
for (var i = 1; i < request.Numbers.Count; i++)
{
sb.Append(request.Operation.GetSymbolString());
sb.Append(request.Numbers[i]);
}
return(sb.ToString());
}
public int ProcessCalculations(CalcRequestModel request)
{
request = Validate(request);
switch (request.Operation)
{
case OperationEnum.Add:
return(request.Numbers.Sum());
case OperationEnum.Subtract:
var sum = request.Numbers[0];
for (var i = 1; i < request.Numbers.Count; i++)
{
sum -= request.Numbers[i];
}
return(sum);
case OperationEnum.Multiply:
var factor = request.Numbers[0];
for (var i = 1; i < request.Numbers.Count; i++)
{
factor = factor * request.Numbers[i];
}
return(factor);
case OperationEnum.Divide:
var numerator = request.Numbers[0];
for (var i = 1; i < request.Numbers.Count; i++)
{
numerator = numerator / request.Numbers[i];
}
return(numerator);
default:
throw new NotImplementedException("Unrecognized mathematical operator");
}
}
