波浪号在表达式中是什么意思? [英] What does the tilde mean in an expression?

问题描述

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可能的重复:
C# 枚举中的波浪号 (~) 是什么?

我在 this MSDN 页面.

(((Width * Planes * BitCount + 31) & ~31)/8) * abs(Height)

这确实可以在 C# Visual Studio 2010 中编译.数字 31 前面的波浪号~"到底是做什么的?我以前从未在表达式中看到过这种语法.

解决方案

这就是 按位补码

a> 运算符，也称为按位求反.

Possible Duplicate:
What is the tilde (~) in a C# enumeration?

I found the following bit of code on a this MSDN page.

(((Width * Planes * BitCount + 31) & ~31) / 8) * abs(Height)

This does indeed compile in C# visual studio 2010. What exactly is the tilde "~" doing in front of the number 31? I've never seen this syntax in an expression before.

解决方案

That is the bitwise complement operator, also known as bitwise negation.

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