First remember that machine words are of fixed size. Say 4, and that your input is: Then pushing everything one position to the left gives: Question what to put as X? with a shift put 0 with rotate put a Now push everything one position to the right gives: Question what to put as X? … Read more
The RFC is just trying to say that a signed integer is a normal 4-byte integer with bytes ordered in a big-endian way. Now, you are most probably working on a little-endian machine and BitConverter.GetBytes() will give you the byte[] reversed. So you could try: For the code to be most portable, however, you can do it like this:
The library BitVector is a pure-Python library for this purpose, and should suit the needs you specified.
The standard way to do division is by implementing binary long-division. This involves subtraction, so as long as you don’t discount this as not a bit-wise operation, then this is what you should do. (Note that you can of course implement subtraction, very tediously, using bitwise logical operations.) In essence, if you’re doing Q = … Read more
If x > y, then y – x or (y + (~x + 1)) will be negative, hence the high bit will be 1, otherwise it will be 0. But we want x <= y, which is the negation of this. Even better, drop the shift operator and use a bit mask on the high … Read more
According to K&R 2nd edition the results are implementation-dependent for right shifts of signed values. Wikipedia says that C/C++ ‘usually’ implements an arithmetic shift on signed values. Basically you need to either test your compiler or not rely on it. My VS2008 help for the current MS C++ compiler says that their compiler does an arithmetic shift.
As i know binary equivalent of signed int is 11111111111111111111111111111111and based on this, I’m trying to make Maximum and Minimum int value for my program without using limits.h header file. After run my below code i get Minimum value as -2147483648 and Maximum value is 0. Here below is my code: Whats wrong with my … Read more
bitwise_and Calculates the per-element bit-wise conjunction of two arrays or an array and a scalar. Parameters: src1 – first input array or a scalar. src2 – second input array or a scalar. src – single input array. value – scalar value. dst – output array that has the same size and type as the input … Read more
I see that when I subtract positive and negative number using two’s complement I get overflows. For example, if I subtract 1 from 2 I get: So here the result has fifth left bit 10001 – is it overflow? I’ve found these rules for detected overflows with two’s complement: If the sum of two positive numbers yields a negative … Read more
int checker is used here as a storage for bits. Every bit in integer value can be treated as a flag, so eventually int is an array of bits (flag). Each bit in your code states whether the character with bit’s index was found in string or not. You could use bit vector for the same reason instead … Read more