What is Kotlin equivalent for bitwise or with assignment ‘|=’?
There is no built in bitwise-or assignment operator in Kotlin (yet).
bitwise-operators
A clear, layman’s explanation of the difference between | and || in c#?
|| is the logical-or operator. See here. It evaluates to true if at least one of the operands is true. You can only use it with boolean operands; it is an error to use it with integer operands. // Example var one = true || bar(); // result is true; bar() is never called var … Read more
Why use the Bitwise-Shift operator for values in a C enum definition?
Maybe writing the values in hexadecimal (or binary) helps 🙂 enum { kCGDisplayBeginConfigurationFlag = (1 << 0), /* 0b0000000000000001 */ kCGDisplayMovedFlag = (1 << 1), /* 0b0000000000000010 */ kCGDisplaySetMainFlag = (1 << 2), /* 0b0000000000000100 */ kCGDisplaySetModeFlag = (1 << 3), /* 0b0000000000001000 */ kCGDisplayAddFlag = (1 << 4), /* 0b0000000000010000 */ kCGDisplayRemoveFlag = (1 … Read more
How to get the logical right binary shift in python
There isn’t a built-in operator for this, but you can easily simulate the >>> yourself: >>> def rshift(val, n): return val>>n if val >= 0 else (val+0x100000000)>>n … >>> rshift(-1000, 3) 536870787 >>> rshift(1000, 3) 125 The following alternative implementation removes the need for the if: >>> def rshift(val, n): return (val % 0x100000000) >> … Read more
Performance wise, how fast are Bitwise Operators vs. Normal Modulus?
Unless you’re using an ancient compiler, it can already handle this level of conversion on its own. That is to say, a modern compiler can and will implement i % 2 using a bitwise AND instruction, provided it makes sense to do so on the target CPU (which, in fairness, it usually will). In other … Read more
Operator precedence (bitwise ‘&’ lower than ‘==’)
You need to ask Brian Kernighan or Dennis Ritchie. From this forum: http://bytes.com/topic/c/answers/167377-operator-precedence The && and || operators were added later for their “short-circuiting” behavior. Dennis Ritchie admits in retrospect that the precedence of the bitwise operators should have been changed when the logical operators were added. But with several hundred kilobytes of C source … Read more
Mod of power 2 on bitwise operators?
He meant that taking number mod 2^n is equivalent to stripping off all but the n lowest-order (right-most) bits of number. For example, if n == 2, number number mod 4 00000001 00000001 00000010 00000010 00000011 00000011 00000100 00000000 00000101 00000001 00000110 00000010 00000111 00000011 00001000 00000000 00001001 00000001 etc. So in other words, number … Read more
Understanding the bitwise AND Operator
Numbers can be expressed in binary like this: 3 = 000011 5 = 000101 10 = 001010 …etc. I’m going to assume you’re familiar with binary. Bitwise AND means to take two numbers, line them up on top of each other, and create a new number that has a 1 where both numbers have a … Read more
how to do bitwise exclusive or of two strings in python?
You can convert the characters to integers and xor those instead: l = [ord(a) ^ ord(b) for a,b in zip(s1,s2)] Here’s an updated function in case you need a string as a result of the XOR: def sxor(s1,s2): # convert strings to a list of character pair tuples # go through each tuple, converting them … Read more
What does ‘x
x << -n is equal to x << (32 – n) ~3 == -4 so 5 << ~3 === 5 << (32 – 4) === 5 << 28 which is 1,342,177,280 to be accurate X << -n is not the same as X << (32 – n) … in fact it’s both simpler and more … Read more