public string Add(string term1, string term2)
{
INumberValidator <double> validator = new DoubleValidator();
if (validator.ValidateNumber(term1, out double value1) &&
validator.ValidateNumber(term2, out double value2))
{
return((value1 + value2).ToString());
}
else
{
throw new ArgumentException();
}
}
public string Multiply(string multiplied, string factor)
{
INumberValidator <double> validator = new DoubleValidator();
if (validator.ValidateNumber(multiplied, out double value1) &&
validator.ValidateNumber(factor, out double value2))
{
return((value1 * value2).ToString());
}
else
{
throw new ArgumentException();
}
}
public string Subtract(string minuend, string subtrahend)
{
INumberValidator <double> validator = new DoubleValidator();
if (validator.ValidateNumber(minuend, out double value1) &&
validator.ValidateNumber(subtrahend, out double value2))
{
return((value1 - value2).ToString());
}
else
{
throw new ArgumentException();
}
}
public string Divide(string dividend, string divider)
{
INumberValidator <double> validator = new DoubleValidator();
if (validator.ValidateNumber(dividend, out double value1) &&
validator.ValidateNumber(divider, out double value2))
{
if (value2 == 0)
{
throw new DivideByZeroException();
}
else
{
return((value1 / value2).ToString());
}
}
else
{
throw new ArgumentException();
}
}
