将2的补码转换为十进制 [英] Convert 2's complement to decimal

问题描述

我在c＃中工作，我有一个字节代表数字的2的补码值，我需要将其转换为十进制。该字节来自加速度计LIS302DL。提前谢谢！

I`m working in c# and i have a byte representing the 2's complement value of a number and i need to convert it to decimal. This byte comes from an accelerometer LIS302DL. Thanks in advance!

推荐答案

表示2的补码的字节可能只意味着一件事：隐含类型是有符号字节（或者这不是2的补码）。您可以通过赋值将其直接转换/转换为int变量或任何其他更宽的有符号整数类型。目前尚不清楚十进制是什么意思。在这是一个字符串，您可以使用 sprintf 或 ToString 将其转换为字符串。

-SA

A "byte representing the 2's complement" might mean only one thing: the implied type is signed byte (or this is not 2's complement). You can cast/convert it directly to a variable of int or any other wider signed integer type, implicitly, by assignment. It's not clear what to you mean by 'decimal'. In this is a string, you can convert it to string using sprintf or ToString.

—SA

我知道这个问题已经老了但是很糟糕，下一个人的例子没有受到伤害。数学很简单。

I know the question is old but heck, an example for the next guy doesn't hurt. The math is quite simple for this.

public static int ConvertTwosComplementByteToInteger(byte rawValue)
{
    // If a positive value, return it
    if ((rawValue & 0x80) == 0)
    {
        return rawValue;
    }

    // Otherwise perform the 2's complement math on the value
    return (byte)(~(rawValue - 0x01)) * -1;
}

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