Bitwise operator

Logic and Bitwise operators in Python

By

Open Ended

¬How many times the loop will run according to the below code

word = "Python"

for letter in word:

    print(xletter)

Objectives

¬PC 3.1 Identify the logical operators AND, OR, and NOT and construct the truth table for logical operations within a statement or a computer program.

¬PC 3.2 Create code that utilizes bitwise and logical operators and evaluate its output

¬PC 3.3 Implement the correct syntax for a particular bitwise or logical operator according to a given scenario

¬PC 3.4 Evaluate expressions using De Morgan law by applying it within the code for a given scenario to demonstrate the negation of conjunction and disjunction

¬PC 3.5 Demonstrate understanding of bitwise operators as operators to deal with every bit separately where the arguments of these operators must be integers

¬PC 3.6 Perform calculations of logical operators and bitwise operators in both normal and appreciated/shorthand form

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​Overview of Python's Bitwise Operators

¬Python comes with a few different kinds of operators, such as the arithmetic, logical, and comparison operators.

¬Bitwise operations are performed on integers, and more specifically the underlying binary digits of an integer.

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​​Overview of Python's Bitwise Operators

Bitwise AND

¬The operator symbol for AND is &. The statement is true (1) if the value of x and y are 1. Both values must be equal to 1. If only one variable is 1, the result is false (0).

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Bitwise AND

Example: 

a = 10 = 1010 (Binary)

b = 4 = 0100 (Binary)

a & b = 1010

& 0100

= 0000

= 0 (Decimal)

​

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Multiple Choice

What is the output of the following code

x = 1

y = 1

print(x & y)

• True

• False

Multiple Choice

What is the output of the following code?

x = 0

y = 1

print(x & y)

• True

• False

​Bitwise OR

¬The operator symbol for OR is |. The statement is true (1) if either value of x or y are 1. Both values must be equal to 0 for the result to be 0. If both values are set to 1, the result is true (1). If both values are set to 0, the result is false (0).

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Bitwise OR

a = 10 = 1010 (Binary)

b = 4 = 0100 (Binary)

a | b = 1010

|

0100

= 1110

= 14 (Decimal).

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Multiple Choice

What is the output of the following Code?

x = 1

y = 0

print(x|y)

• True

• False

Bitwise NOT

¬The operator symbol for NOT is ~. This is a negation operator, meaning it is the opposite of the value. If x = 1, then ~x = 0. If y = 0, then ~y = 1. ~x can be read as NOT x, while ~y can be read as NOT y.

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Bitwise NOT

a = 10 = 1010 (Binary)

~a = ~1010

= -(1010 + 1) =

-(1011) =

-11 (Decimal)​

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Activity

# Python program to show

# bitwise operators​

a = 10

b = 4​

# Print bitwise AND operation

print("a & b =", a & b)​

# Print bitwise OR operation

print("a | b =", a | b)​

# Print bitwise NOT operation

print("~a =", ~a)

 

De Morgan's Law

De Morgan's law state that

"not (A and B)" is the same as "(not A) or (not B)"

and also,

"not (A or B)" is the same as "(not A) and (not B)"​

​

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De Morgan's Law

​Activity

x = int(input("Enter a value for x: "))

y = int(input("Enter a value for y: "))

print ((not(x < 15 and y >= 3)))

print ((x >= 15 or y < 3))

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The End

Thank you :)