How to reverse bitwise AND (&) in C ?

Posted by VaioIsBorn on Stack Overflow See other posts from Stack Overflow or by VaioIsBorn
Published on 2010-04-02T10:49:43Z Indexed on 2010/04/02 10:53 UTC
Read the original article Hit count: 184

Filed under:

reverse

For example i have an operation in C like this:

((unsigned int)ptr & 0xff000000))

The result is bf000000. What do i need at this moment is how to reverse the above i.e. determine the ptr by using the result from the operation and offcourse 0xff000000 . I am asking if there's any simple way to implement this in C, tnx.

Related posts about bitwise-operations

bitwise operations on strings with ruby

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I perform bitwise operations on strings in ruby? I would like to do bitwise & a 4-byte string with a 4-byte long hex such as ("abcd" & 0xDA2DFFD3). I cannot get the byte values of the string. Thanks for your help. >>> More
Bitwise Operations -- Arithmetic Operations..

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, Can you please explain the below lines, with some good examples. A left arithmetic shift by n is equivalent to multiplying by 2n (provided the value does not overflow), while a right arithmetic shift by n of a two's complement value is equivalent to dividing by 2n(2… >>> More
48-bit bitwise operations in Javascript?

as seen on Stack Overflow - Search for 'Stack Overflow'
I've been given the task of porting Java's Java.util.Random() to JavaScript, and I've run across a huge performance hit/inaccuracy using bitwise operators in Javascript on sufficiently large numbers. Some cursory research states that "bitwise operators in JavaScript are inherently slow," because internally… >>> More
Most common C# bitwise operations

as seen on Stack Overflow - Search for 'Stack Overflow'
For the life of me, I can't remember how to set, delete, toggle or test a bit in a bitfield. Either I'm unsure or I mix them up because I rarely need these. So a "bit-cheat-sheet" would be nice to have. For example: flags = flags | FlagsEnum.Bit4; // Set bit 4. or if ((flags == FlagsEnum.Bit4))… >>> More
Bitwise Operations on Rows of lil_matrix

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I quickly extract two rows of a scipy.sparse.lil_matrix and apply bitwise operations on them? I've tried: np.bitwise_and(A[1,:], A[2,:]) but NumPy seems to want an array type according to the documentation. >>> More

Developer IT

How to reverse bitwise AND (&) in C ? - Developer IT

How to reverse bitwise AND (&) in C ?

c

bitwise-operations

reverse

Related posts about c

Related posts about bitwise-operations

bitwise operations on strings with ruby

Bitwise Operations -- Arithmetic Operations..

48-bit bitwise operations in Javascript?

Most common C# bitwise operations

Bitwise Operations on Rows of lil_matrix

Categories cloud