相反，使用 + 或 * 等符号定义可以执行普通数字加减法的函数。
Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.
基于符号数字负二进制表达，提出了任意字长操作数的并行两步加法与一步减法。
Based on sign digit negabinary representation, the two step addition and one step subtraction of arbitrary length operands can be performed.
二进制加减法，全加器实现及其性能，高速加法，带符号算术运算。
Binary Addition and Subtraction, Implementation and Performance of the Full Adder, High-speed Addition, Signed Arithmetic.
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