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-- currently MainActivity.java does not accommodate negative numerics when parsing the "-" operator

-- btnSub() event needs a helper to count the number and place of the "-" operator

-- similar logic will be required in the ext.parseOperand() method within ExtActivity.java

• calculations not displaying correct output to field.

-- set global operator bool to eval the math type being performed

• _add / _sub / _multi / _div

-- send the operator bool to ext.parseOperator()

• input values are writing L > R, needs to write R > L.
• writing L > R reverses the logic of Division && Subtraction (Addition && Multiplication unaffected as these are dynamic)

-- parse out each operand and eval the number of decimals contained in each numeric value

-- general QA and debugging of the core application functionality

-- since using a default float var in ExtActivity, need to trim the decimal(s) if result is [VAL].0

-- parseOperator()
-- eval the mathematical method to use based on operator val passed

-- parseOperand()

• parse the string passed into the numeric digits being calc'd

-- build mathematical funcs

• doAdd()
• doSub()
• doMulti()
• doDiv()