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What is right shift and left shift?

Updated: 12/11/2022
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Q: What is right shift and left shift?
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What is a bit shift?

A bit shift is a bitwise operation in which the bits in a value are shifted left or right.


What is logical shift?

A logical shift moves bits left or right. After a left shift, the high-order bit is lost while a zero is inserted in the low-order bit. After a right-shift, the low-order bit is lost and a zero inserted in the high-order bit. The left (<<) and right (>>) shift operators are binary operators; the first operand is the value being shifted, the second operand is the number of bit positions to shift. Thus x << y will left shifts all the bits of x by y bit positions.


How do the arithmetic shift and logical shift differ?

With a logical shift the vacated bits are always filled with zeroes. With an arithmetic shift, a left shift will fill vacated bits with zeroes but a right shift fills the vacated bits with a copy of the most significant bit.


What is operator associativity in C?

OperatorDescriptionAssociativity()[].->++ -- Parentheses (function call) (see Note 1)Brackets (array subscript)Member selection via object nameMember selection via pointerPostfix increment/decrement (see Note 2) left-to-right++ --+ -! ~(type)*&sizeof Prefix increment/decrementUnary plus/minusLogical negation/bitwise complementCast (change type)DereferenceAddressDetermine size in bytes right-to-left * / % Multiplication/division/modulus left-to-right + - Addition/subtraction left-to-right > Bitwise shift left, Bitwise shift right left-to-right < >= Relational less than/less than or equal toRelational greater than/greater than or equal to left-to-right == != Relational is equal to/is not equal to left-to-right & Bitwise AND left-to-right ^ Bitwise exclusive OR left-to-right | Bitwise inclusive OR left-to-right && Logical AND left-to-right Logical OR left-to-right ?: Ternary conditional right-to-left =+= -=*= /=%= &=^= |== AssignmentAddition/subtraction assignmentMultiplication/division assignmentModulus/bitwise AND assignmentBitwise exclusive/inclusive OR assignmentBitwise shift left/right assignment right-to-left ,Comma (separate expressions) left-to-right


Define simply type of shift register?

There are several types of shift registers: PISO: parallel-in serial-out shift registers such as the 7495(?), 74HC165, 74HC166 serial parallel counter load a one and shift it out serially bingo sequential pulses SIPO: serial-in parallel-out shift registers such as the 74HC595, 74HC4094, TPIC6595, TLC5925. Typically data is shifted into the register one bit at a time through "the" input pin. Most "POV clocks" and "POV displays" use such chips to drive the spinning LEDs. Most such chips can be wired up to "shift left", or they can be wired up to "shift right", but once wired up can only do one or the other. bidirectional SIPO: bidirectional serial-in parallel-out shift registers. Once wired up, an external control line can dynamically switch it from "shift left" -- feeding in a new bit on the "least significant bit input pin" -- and at some other time it can "shift right" -- feeding in a new bit on the "most significant bit input pin". "universal" shift registers, such as the 74AC299, can do any of the above (at different times): output the current state of the register in parallel, shift left, shift right, and load the new state of the register in parallel.