在 C# 中将正数转换为负数
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Convert a positive number to negative in C#
提问by
You can convert a negative number to positive like this:
您可以像这样将负数转换为正数：
int myInt = System.Math.Abs(-5);
Is there an equivalent method to make a positive number negative?
是否有等效的方法使正数变为负数？
采纳答案by bryanbcook
How about
怎么样
myInt = myInt * -1
回答by TJ L
int negInt = 0 - myInt;
Or guaranteed to be negative.
或者保证为负。
int negInt = -System.Math.Abs(someInt);
回答by Jim W
int myNegInt = System.Math.Abs(myNumber) * (-1);
回答by driis
The easy way:
简单的方法：
myInt *= -1;
回答by Warren Pena
Multiply it by -1.
乘以-1。
回答by JDunkerley
int negInt = -System.Math.Abs(myInt)
回答by Joe White
The same way you make anything else negative: put a negative sign in front of it.
用同样的方法让其他任何东西变成负数：在它前面放一个负号。
var positive = 6;
var negative = -positive;
回答by impomatic
int myInt = - System.Math.Abs(-5);
回答by Charles Bretana
EDIT: This is wrong for positive inputs... I made mistake of forgetting that the rest of the bits in -x (2s-Complement value) are the 'opposite' of their value in +x, not the same. SO simply changing the sign bit will NOT work for positive numbers.
编辑：这对于正输入是错误的......我错误地忘记了 -x 中的其余位（2s-补码值）是它们在 +x 中的值的“相反”，不相同。所以简单地改变符号位对正数不起作用。
I'll leave this here for in for purposes...
出于目的，我将把它留在这里...
Or the tricky way ( I think )...
或棘手的方式（我认为）...
int y = x | ~int.MaxValue;
整数 y = x | ~int.MaxValue;
cause int.MaxValue is 0111 1111 1111 1111 1111 1111 1111 1111
so
所以
~int.MaxValue is 1000 0000 0000 0000 0000 0000 0000 0000
and therefore any int32 Or'ed with that will put a 1 in the sign bit, (making it negative), and leave all the other bits the same...
因此，任何 int32 Or'ed 都会在符号位中放置一个 1（使其为负），并使所有其他位保持不变......
EDIT: actually, Since the 1000 0000 0000 0000 0000 0000 0000 0000 is actually the Minvalue, this should also work:
编辑：实际上，由于 1000 0000 0000 0000 0000 0000 0000 0000 实际上是 Minvalue，这也应该有效：
int y = x | int.MinValue; // or, to do it to itself,
x |= int.MinValue;
回答by Guffa
To switch the sign of an integer, you just use the sign operator:
要切换整数的符号，只需使用符号运算符：
myInt = -myInt;
To make it negative regardless if the original value is negative or not, you first use the Abs method:
无论原始值是否为负，要使其为负，您首先使用 Abs 方法：
myInt = -Math.Abs(myInt);
