Title says it all. I understand that &x gives x's address, but I came across multiple examples of lines like (x & y) today and I haven't been able to find any explanation. It's a hard question to search for.
In C, what does the & operator do when used like this: (x & y)?
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This is the biwise and. It will perform a logical
andbetween all bits of the integers a and b.It is usually used for masking, which means clearing (forcing bits to zero) of some parts of an integer.
Exemple: I have a color code stored in a variable
rgbwith 8 bits encoding the red component, 8 bits encoding the green componant and 8 bits encoding the blue component. If I want to extract the blue component I will use a&mask the following way: