adder-subtracter
A digital circuit or device that performs both addition and subtraction; a technical term in computing and electronics.
This adder-subtracter performs binary addition and subtraction in a single circuit.
加算器 is an adder (addition only), while 加減算器 handles both addition and subtraction.
減算器 is a subtracter (subtraction only), while 加減算器 combines both operations.
Compound of 加減 (addition and subtraction) + 算器 (calculator). A straightforward technical term.