How to perform the bitwise NOR operation in Swift

Overview

The bitwise NOR operation in Swift negates the logical OR operation on two 8-bit binary numbers. It does not have an assigned operator, so we perform it by the following two combinations:

• The OR (|) and the NOT (~ ) operators
• The AND (&) and the NOT (~ ) operators

Method 1: Using OR (|) and NOT (~)

In this method, we first perform the bitwise OR (|) operation on two numbers, and then invert the result using the NOT (~) operator.

Syntax

The syntax for the bitwise NOR operator is as follows:

Return value

The possible return values of the bitwise NOR operation on different combinations of bits are summarized below:

Code

The code for performing the bitwise NOR operation on two numbers using the OR and NOT operators is as follows:

Explanation

• Lines 2–3: We declare two new variables, firstNumber and secondNumber. We assign them the integer values 10 (00001010 in binary) and 20 (00010100 in binary), respectively.
• Line 6: We perform the bitwise NOR operation. We transverse the firstNumber and secondNumber variables bitwise. The resulting bit sets to $1$ if one of the bits is $1$. Otherwise, they are set to $0$. The resulting number is inverted.

The complete calculation is shown below:

To convert a binary into a negative decimal, the left-most bit represents the sign (negative if $1$, and positive if $0$). In the example above, the left-most bit is $1$, so the answer is a negative value.

The calculation is as follows: $resultNumber=(-1*2^7)+(1*2^6)+(1*2^5)+(1*2^4)+(0*2^3)+(1*2^2)+(0*2^1)+$

Method 2: Using AND (&) and NOT (~)

In this method, we first perform the bitwise NOT (~) operation on each of the two numbers and then apply the bitwise AND (&) operation on the resulting two numbers.

Syntax

The syntax for the bitwise NOR operator is as follows:

Return value

The possible return values of the bitwise NOR operation on different combinations of bits are summarized below:

Code

The code for performing the bitwise NOR operation on two numbers using AND and NOT operators is as follows:

Explanation

• Lines 2–3: We declare two new variables, firstNumber and secondNumber. We assign them the integer values 10 (00001010 in binary) and 20 (00010100 in binary), respectively.
• Line 6: We perform the bitwise NOR operation. The traverse the firstNumber and secondNumber variables bitwise, and the resulting bit is set to $1$ if it is $0$. Otherwise, they are set to $0$. Next, we perform the bitwise AND operation on the inverted values of firstNumber and secondNumber.

The complete calculation is as follows: