※ 引述《kindaichitom (饭吃到下巴脱臼)》之铭言： : 10110111(2进位)是下列哪个数字的2's补数？ : A. 73 B. 81 C. -73 D. -81 : 答案: C. : 可是我认为是选项A耶... : 73的二进制 01001001 : 转成1的补数 10110110 : 转成2的补数 10110111 : 所以是73 : 是不是我观念有错还是误解题意呢?? : Thanks!! 今天终於在英文的 wikipedia上看到当初我 发这篇文章的疑惑点，算是ambiguity吧!? http://en.wikipedia.org/wiki/Two's_complement 这文篇的下面段落在讨论 Potential ambiguities in usage One should be cautious when using the term two's complement, as it can mean either a number format or a mathematical operator. For example 0111 represents 7 in two's-complement notation, but 1001 is the two's complement of 7, which is the two's complement representation of –7. In code notation or conversation the statement "convert x to two's complement" may be ambiguous, as it could describe either the change in representation of x to two's-complement notation from some other format, or else (if the writer really meant "convert x to its two's complement") the calculation of the negated value of x. ^^^^^^^ 应该是negative? 看了这段讨论我在想这个ambiguity有关系到原先我发问的题目 所以我原来的答案其实也不能算是错的? thanks!! --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.228.105.119 ※ kindaichitom:转录至看板 ask 03/14 04:02 ※ 编辑: kindaichitom 来自: 61.228.105.119 (03/14 04:06)