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2017-01-04 19:01 Fast bitwise operations on a long »
I know I can write the following method to calculate the set bit indexes of a long : private static List<Integer> bitPositions(long number) { ...
(3) odpowiedzi
2016-12-14 04:12 Unsigned Right Shift / Zero-fill Right Shift in PHP (Java/JavaScript equivalent) »
Before flagging this as a duplicate, please read below, and check my code! So my problem is that, I have to implement Java/JavaScript '>>>' (Unsigned...
(1) odpowiedzi
2016-10-22 18:10 Very fast way to check set bit in C »
I'm using some sort of BitStream in my code that has a read_bit()-function. This function is called very very often (more than one billion times in a ...
(4) odpowiedzi
2016-05-05 16:05 Times two faster than bit shift? »
I was looking at the source of sorted_containers and was surprised to see this line: self._load, self._twice, self._half = load, load * 2, load >&...
(1) odpowiedzi
2016-05-01 10:05 Fibonacci function doesn't calculate properly »
I've defined this macro #define FIB(n) (( 4 << n*(3+n))/((4 << (2*n)) - (2 << n) - 1))%(2 << n) and when I try to get an an...
(1) odpowiedzi
2016-03-30 11:03 Java bitwise operator << »
Can someone explain why the following bitwise expressions return different results: System.out.println((-1<<31)<<1); // it prints 0 Sys...
(2) odpowiedzi
2016-02-23 14:02 Why does bit-wise shift left return different results in Python and Java? »
I'm trying to port some functionality from a Java app to Python. In Java, System.out.println(155 << 24); Returns: -1694498816 In Python: p...
(3) odpowiedzi
2015-10-11 11:10 How does this approximation of division using bit shift operations work? »
In java.util.DualPivotQuicksort, the following line of code appears: // Inexpensive approximation of length / 7 int seventh = (length >> 3) + (...
(4) odpowiedzi
2015-09-28 12:09 Shift operators - operands must be convertible to an integer primitive? »
I'm preparing myself to a Java exam, and I'm reading "OCA Java SE 8 Programmer Study Guide (Exam 1Z0-808)". In operators section I found this sentence...
(2) odpowiedzi