Floating-Point Operations
Addition/Subtraction is then:
(1) Check for 0 operands
(2) Align the fractions by selecting the fraction with the smaller exponent. Then shift that fraction to the right and increment smaller exponent until both are equal.
(3) Add or subtract (complement-add) the fractions
(4) Set the exponent of the result to the larger exponent.
(5) Normalize the result, if necessary
(6) Check for overflow or underflow.