LOGICAL BITWISE OPERATORS

What are bitwise operators ?

The bitwise operators are similar to the logical operators, except that they work on a smaller scale. Bitwise operators are used to change individual bits in an operand. A single byte of computer memory-when viewed as 8 bits-can signify the true/false status of 8 flags because each bit can be used as a boolean variable that can hold one of two values: true or false.

LIST OF BITWISE OPERATORS

NAME	OPERATOR	SYNTAX	DESCRIPTION
Bitwise AND	&	x & y	The output of bitwise AND is 1 if the corresponding bits of two operands is 1. If either bit of an operand is 0, the result of corresponding bit is evaluated to 0.
Bitwise OR	|	x | y	The output of bitwise OR is 1 if at least one corresponding bit of two operands is 1. In C Programming, bitwise OR operator is denoted by |.
Bitwise NOT	~	~x	Returns one’s compliement of the number.
Bitwise XOR	^	x ^ y	Returns 1 if one of the bit is 1 and other is 0 else returns false
Bitwise right shift	>>	x>>	The left operands value is moved right by the number of bits specified by the right operand.
Bitwise left shift	<<	x<<	The left operands value is moved left by the number of bits specified by the right operand.

EXAMPLE

TERM DOCUMENT INCIDENCE MATRICES

NOTE : 1 if play contains word, 0 otherwise.

	Anthony and Cleopatra	Julius Caesar	The Tempest	Hemlet	Othello	Macbeth
Anthony	1	1	0	0	0	1
Brutus	1	1	0	1	0	0
Caesar	1	1	0	1	1	1
Calpurnia	0	1	0	0	0	0
Cleopatra	1	0	0	0	0	0
Mercy	1	0	1	1	1	1
worser	1	0	1	1	1	0

So in above matrices we have 0 or 1 for each term.
Example Query : Take the vectors for Brutus, Caesar and Not Calpurnia.
Brutus : 110110
Caesar : 110111
NOT Calpurnia : 101111
ANSWER : 110100 AND 110111 AND 101111 = 100100
1st and 4th bits are 1, which means first and fourth play satisfy our query.

Program to demonstrate Logical bitwise operation :

plays={"Anthony and Cleopatra":"Anthony is there, Brutus is Caeser is with Cleopatra mercy worser.",

"Julius Ceaser":"Anthony is there, Brutus is Caeser is but Calpurnia is.",

"The Tempest":"mercy worser",

"Ham let":"Caeser and Brutus are present with mercy and worser",

"Othello":"Caeser is present with mercy and worser",

"Macbeth":"Anthony is there, Caeser, mercy."}

words=["Anthony","Brutus","Caeser","Calpurnia","Cleopatra","mercy","worser"]

vector_matrix=[[0 for i in range(len(plays))] for j in range(len(words))]

text_list=list((plays.values()))

for i in range(len(words)):

for j in range(len(text_list)):

if words[i] in text_list[j]:

vector_matrix[i][j]=1

else:

vector_matrix[i][j]=0

for row in vector_matrix:

print(row)

vector_dict={}

for vector in range(len(vector_matrix)):

mystring = ""

for digit in vector_matrix[vector]:

mystring += str(digit)

vector_dict[words[vector]]=int(mystring,2)

print(vector_dict)

condition=input("Enter your condition: ")

condition1=condition

for i in words:

if i in condition1:

condition1=condition1.replace(i,str(vector_dict[i]))

print(condition1)

condition1=condition1.replace("and not"," & ~")

condition1=condition1.replace("and"," & ")

condition1=condition1.replace("or"," | ")

stri=bin(eval(condition1)).replace("0b","")

print("The plays which satisfy the condition",condition," are ")

print(stri)

for char in range(len(stri)):

if stri[char]=="1":

print(list(plays.keys())[char])

OUTPUT