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[英]C# Signed & Unsigned Integral to Big Endian Byte Array, and vice versa using Bitwise way with “best” performance
[英]C# byte arrays - signed and unsigned dilemma
我從有符號字節數組開始,然后轉換為無符號..那么打印結果正確嗎?
byte[] unsigned = new byte[] {10,100,120,180,200,220,240};
sbyte[] signed = Utils.toSignedByteArray(unsigned);
和打印(我只是將它們附加一個StringBuilder):
簽名:[10,100,120,-76,-56,-36,-16]
未簽名:[10,100,120,180,200,220,240]
哪里:
public static sbyte[] toSignedByteArray(byte[] unsigned){
sbyte[] signed = new sbyte[unsigned.Length];
Buffer.BlockCopy(unsigned, 0, signed, 0, unsigned.Length);
return signed;
}
如果我改成這個,我得到相同的結果。
sbyte[] signed = (sbyte[])(Array)unsigned;
-128(帶符號)不應該變成0,-118(帶符號)不應該變成10,依此類推..而不是10(帶符號)= 10(無符號)!
因為
字節-128至127
字節0至255
所以??
有符號整數在二進制補碼系統中表示 。
例子:
Bits Unsigned 2's complement
value value
00000000 0 0
00000001 1 1
00000010 2 2
01111110 126 126
01111111 127 127
10000000 128 −128
10000001 129 −127
10000010 130 −126
11111110 254 −2
11111111 255 −1
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