问题描述
大家好，
您能否让我知道如何获得等于有符号长值的无符号长数????我不需要代码，我需要公式.
例如:如果 signed long var = -15 ，那么 var 的无符号值将是什么?
请回复.
请注意，我不是在寻找代码，我只需要公式.
Hi All,
can you please let me know how can I get unsigned long equivalent to signed long value??? i do not want code,i need formula.
Example: if signed long var = -15 then what will be equivalent value of var when it is unsigned?
Please reply.
Please note that i am not looking for code,i need formula only.
推荐答案
nneg = (2**WordSize - n) mod 2**WordSize
用来.对于32位处理器，您的示例值15将为
is used. For a 32-bit processor and your example value 15 that would be
nneg = 2**32 - 15 = 4 294 967 281 = 0xFFFF FFF1
一些较旧的处理器使用One's Complement表示.对他们来说，公式是
Some older processors use One''s Complement representation. For them the formula is
nneg = (2**WordSize-1 - n) mod 2**WordSize
这意味着值0具有两个表示形式，分别为0x00000000和0xffffffff.
which means that the value 0 has two representations namily 0x00000000 and 0xffffffff.
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