Based on sign digit negabinary representation, the two step addition and one step subtraction of arbitrary length operands can be performed.

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。

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Simple arithmetic expressions, including addition, subtraction, etc. , to enter an equal sign marks the end of the STL.

说明：用STL实现简单运算表达式，其中包括加减乘除等，以输入等号为结束标志。

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