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ビットシフト計算機 (左/右シフト)

開発者数学

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入力

自動処理

出力

クライアント側

結果（小数点）

結果（バイナリ）

Result (Hex)

Shift Details

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ガイド

Bitwise Shift Calculator

Perform left shift, arithmetic right shift, and logical right shift operations on integers with instant binary visualization. Enter a number in decimal, binary, hex, or octal, choose your shift amount, and see exactly how every bit moves — including carry and overflow.

使い方

Enter your number in any supported format (decimal, binary with 0b prefix, hex with 0x prefix, or octal with 0o prefix). Select the bit width (8, 16, 32, or 64-bit), choose the shift operation type, set the shift amount, and the result updates in real time. The binary visualization highlights exactly which bits shifted and where overflow or sign extension occurred.

特徴

Three shift operations – Left shift (<<), arithmetic right shift (>>), and logical right shift (>>>) with clear visual differences
Multiple input formats – Enter numbers in decimal, binary (0b), hexadecimal (0x), or octal (0o)
Configurable bit width – Support for 8-bit, 16-bit, 32-bit, and 64-bit integers
Binary visualization – See before and after binary representations with highlighted shifted bits
Overflow detection – Shows carry and overflow bits that shift beyond the bit width boundary
Real-time calculation – Results update instantly as you type or adjust the shift amount
Power of 2 explanation – Displays the equivalent multiplication or division operation for each shift

Understanding Bitwise Shift Operations

Bitwise shifts move all bits in a binary number left or right by a specified number of positions. Left shifting by n positions is equivalent to multiplying by 2^n, making it one of the fastest multiplication operations in computing. Right shifting divides by powers of 2, but the behavior differs between arithmetic shifts (which preserve the sign bit) and logical shifts (which fill with zeros).

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These operations are fundamental in low-level programming, embedded systems, graphics programming, and cryptography. Understanding how bits move helps developers write faster code and debug binary-level issues more effectively.

What is the difference between arithmetic and logical right shift?

Arithmetic right shift (>>) preserves the sign bit — if the leftmost bit is 1 (negative number in two’s complement), it fills new positions with 1s. Logical right shift (>>>) always fills with 0s regardless of the sign bit. This distinction matters when working with signed integers, since arithmetic shift maintains the number’s sign while logical shift treats the value as unsigned.

Why is bit shifting faster than multiplication?

Bit shifting is a single CPU instruction that physically moves bits in a register, taking just one clock cycle on most processors. Multiplication requires multiple addition and shift operations internally, even with hardware multipliers. Compilers often optimize multiplication by powers of 2 into shift operations automatically, but understanding shifts helps when writing performance-critical code in embedded systems or real-time applications.

What happens when you shift bits beyond the integer width?

Bits that shift past the boundary of the integer width are lost — they overflow and cannot be recovered. For a left shift on an 8-bit integer, shifting by 8 or more positions results in zero since all original bits have been pushed out. Most programming languages define this behavior in their specifications, though some (like C) consider shifting by more than the type width to be undefined behavior.

How are bitwise shifts used in real-world programming?

Bitwise shifts are used extensively in graphics programming for color channel extraction (shifting RGB values), network protocols for packing and unpacking header fields, cryptographic algorithms like SHA and AES, embedded systems for register manipulation, and game development for fast coordinate calculations. They are also common in data compression algorithms and hash functions.

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