输入字符中包含不是有符号数字的字符。
An input character was encountered that was not a signed digit.
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.
将数字作为文本对待会产生错误结果，尤其是当这些值是有符号数字时，因此，列文本必须转换为数字类型。
Treating numerical values as text yields incorrect results, especially if those values are signed; therefore, the column text must be converted to a numerical type.
可以使用许多计算机程序来帮助您解决数字和符号数学问题，但是还有些程序可以帮助您学习数学。
Many computer programs are available to assist you in solving numerical and symbolic mathematical problems, but there are also programs to help you learn about mathematics.
可以使用许多计算机程序来帮助您解决数字和符号数学问题，但是还有些程序可以帮助您学习数学。
Many computer programs are available to assist you in solving numerical and symbolic mathematical problems, but there are also programs to help you learn about mathematics.
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