Want to code a key pad for an calculator. What I want to make is:
Keypad with keys from 0 to 9
Special keys: + – * / . =
My conceptual so far:
When a numeric key is pressed, convert it’s int value into an string and append that string to the bufferString. That way the input value gets built up. When the user presses . (to make a float value), check if . is already in the bufferString. If it is, ignore that.
But: is that really a good way to go? Or should I do all this number input stuff pure mathematically?
The idea is to convert a infix expression to a postfix expression (Reverse Polish notation) using the the Shunting yard algorithm. Then the postfix expression is easy to resolve.