How to convert 2 numbers to 2 parts of a decimal number [C#]

Question

Im trying to convert 2 user inputed numbers (for example):

double number = 5;
double number2 = 23;

into this:

decimalnumber = 5.23;

Answer 1

As to your actual problem about physical calculator - do not store it as numeric at all! Just use it like this:

var userInput = new StringBuilder();
....
userInput.Append(getUserNextChar());
....

Then just parse this input when it is actually needed as numeric:

decimal numeric;
if(!decimal.TryParse(userInput.ToString(), out numeric))
{
    throw new Exception("Invalid user input!");
}
//use your 'numeric' here