For the sake of getting my head around how to use dashboards, buttons etc, I have set myself a take of building a BASIC calculator.
It only does + - * and /
It is just to get a better understanding of things talking to one another.
Basic idea of the main node which is driving me batty:
It looks at the input stream.
(Two streams - of course.)
One is topic set to NUMBER and the other is FUNCTION.
As it gets numbers, it constructs the first number.
Decimal points are there, but I haven’t got to testing it working yet.
As soon as you press a FUNCTION button, it stores the first number, stores the function and wipes the display.
Then you enter the second number.
It is built with the same code as the first number.
When the = button is pressed, it gets the “function” and applies it to the two numbers and displays the result.
So, in the scheme of things these variables are used/made:
x - the actual digit entered.
count - a running value of the number being entered.
dp - used for the decimal point. As said: not tested as yet.
first_number - the complete number entered before a function key is/was pressed.
new_ - a flag to indicate the first time a number is stored.
function_ - the stored value of the function to apply to the two numbers.
It also supports A/C and C.
A/C wipes all stored data while C clears the values being entered now.
For some weird reason (after a lot of messing around) I am seeing new_ is always set to 1.
Though in saying that I shall have to declare that it does now and then work.
But why, I can’t work it out.
This is a bit of a big-ish bit of code, but most of it is “decorative” (buttons etc)
The main part is the function node called CALCULATOR
The calculator node indicates what it is doing.
As you enter digits, they are shown with a green dot.
As you enter a function, it should be shown with a red dot.
BUT!
If it is the first (only?) time you pressed a function button, the dot should be blue.
My testing keeps showing it as red and if I modify the code (line 26 and changing the text from function_ and change it to new_ and it always shows 1) Dunno how/why.
This has been most of today.
Summary:
It doesn’t seem to detect the function buttons being pressed and saving the first number.
This is because the variable “new_” seems to be 1 when it should be 0.
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