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Arithmetic Right Shift Calculator Online

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The Arithmetic Right Shift Calculator is a specialized tool that shifts the bits of a binary number to the right while preserving the sign of the number. Unlike a logical right shift, which fills the leftmost bits with zeros, an arithmetic right shift retains the sign bit (most significant bit) to ensure the number’s sign remains unchanged. This feature is particularly important when dealing with signed binary numbers, as it prevents incorrect results in arithmetic operations.

Formula of Arithmetic Right Shift Calculator

An arithmetic right shift is a bitwise operation that shifts the bits of a binary number to the right. It differs from a logical right shift because it maintains the sign of the number by copying the sign bit (most significant bit) into the new positions.

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Formula for Arithmetic Right Shift

The formula to calculate the arithmetic right shift of a number NNN by kkk positions is as follows:

  1. Convert the number NNN to its binary representation.
  2. Perform the right shift operation:
    • Shift all bits of NNN to the right by kkk positions.
    • Fill the leftmost kkk bits with the original sign bit (most significant bit).
  3. Convert the resulting binary number back to its decimal form.

This process ensures that the sign of the number is preserved during the shift operation, which is crucial for accurate arithmetic computations.

General Terms and Conversion Table

Common Terms

  • Bitwise Operation: An operation that acts on individual bits of a binary number.
  • Binary Number: A number expressed in the base-2 numeral system, using only 0 and 1.
  • Sign Bit: The most significant bit in a binary number, indicating its sign (0 for positive, 1 for negative).
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Conversion Table

This table provides a quick reference for common arithmetic right shifts without the need for manual calculation.

Decimal NumberBinary RepresentationRight Shift by 1Right Shift by 2Right Shift by 3
40100001000010000
-41100111011111111
81000010000100001
-81000110011101111

Example of Arithmetic Right Shift Calculator

Let’s walk through an example of an arithmetic right shift.

Example Calculation

Suppose we have the number -6 and we want to perform an arithmetic right shift by 2 positions.

  1. Convert to Binary: -6 in binary (8-bit representation) is 11111010.
  2. Right Shift by 2: Shifting the bits to the right by 2 positions:
    • Original: 11111010
    • Shifted: 11111110 (the two leftmost bits are filled with the sign bit)
  3. Convert Back to Decimal: The resulting binary number 11111110 is -2 in decimal.
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Therefore, the arithmetic right shift of -6 by 2 positions is -2.

Most Common FAQs

1. What is the difference between an arithmetic right shift and a logical right shift?

An arithmetic right shift preserves the sign of the number by filling the leftmost bits with the sign bit, while a logical right shift fills the leftmost bits with zeros.

2. When should I use an arithmetic right shift?

Use an arithmetic right shift when working with signed binary numbers to ensure that the sign of the number is maintained during the shift operation.

3. How do I convert a negative decimal number to binary for an arithmetic right shift?

To convert a negative decimal number to binary, use its two’s complement representation, which involves inverting the bits of the positive counterpart and adding one to the least significant bit.

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