Perl Tutorial - 39: Bitwise Operators Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming

hello guys welcome to my channel this is
the 39th tutorial in this course and in
this role we'll be talking about bitwise
operators in Perl so I've got a script
here that's called bitwise underscore
operators and in the script on line
number three I have created a variable X
which has a value 90 and then on line
number four I have created a variable Y
which has a value 75 and these numbers
are in decimal form and if suppose you
want to see the corresponding binary
representation of these two numbers and
you would have to use the printf
statement instead of using the print
statement and you would have to put the
format specifier percent B so I have got
a printf statement on line number six
this is first going to display the text
X is a colon a space and then it's going
to show me the binary form of the value
that's stored in variable X because I
put the percent B format specifier here
and after putting the you know closing
double quotation for this string I put a
comma and then I put dollar X here so
you know basically dollar X is going to
be passed to the percent B format
specifier it's corresponding binary form
would be obtained and displayed on
screen at this position similarly I have
a printf statement on line number seven
to see the binary representation of 75
that's the value that's stored in the
variable Y and in Perl you can perform a
bunch of bitwise operations like bit
wise and bitwise or bitwise exclusive or
as well as a ones complement or you know
complement as it is more popularly known
so to perform the bitwise and operation
you use the ampersand symbol once
between the two variables and on line
number nine I have a statement that
performs the bitwise and between x and y
and it stores the result in the variable
and underscore opie and on line number
ten I have a printf statement to see the
value that's been stored in and scorpy
and of course we are going to see the
binary represent
of the output because we want to
actually perform the and operation you
know on the output that we get on line
six and seven to see if we have got a
correct value for and underscore OB here
on line number ten and then to perform
the bitwise or operation you use the
pipe symbol once between the two
variables and I'm storing that output in
or underscore opie and I have a printf
statement on line number thirteen to see
the binary form of the value stored in
this variable then to perform exclusive
all you use the hat symbol which you
would get by shifting up on key six on
most keyboards and then I have a printf
statement on line 16 to see the binary
form of the value stored in the variable
X or underscore opie and then finally on
line number 18 I am calculating the ones
complement of the value stored in the
variable X by putting a tilde or the
waiver operator you know just before the
variable name X and of course you have
to put a dollar symbol there because
it's a scalar variable and then I have a
printf statement on line about 19 to see
the binary form of what's been stored in
the variable comp right so let me
execute the script and show you the
output I'll press f5 on my keyboard and
we see that this is x1 0 W 1 0 1 0 and
then Y is 1 double 0 1 0 W 1 and in
bitwise and the and of 0 and 1 is 0 of 1
and 0 is also 0 of 0 and 0 at 0 and a 1
and 1 its 1 and you know these
operations are performed bitwise so you
could do the math here and then or of 0
+ 1 is 1 of 1 and 0 is 1 of 0 and 0 at 0
and of 1 + 1 is 1 and then exclusive all
basically gives you 1 where the bits are
different and it would give you 0
otherwise
and then once compliment is just you
know change the ones to 0s and zeros to
ones I reckon this these would
b32 because this is a 32-bit Perl
interpreter I haven't counted the number
of digits basically but you know all
these ones are because when you store X
in memory you store a bunch of leading
zeros with the number because you know
you have 32-bit space and the register
so you would want to utilize all of it
and you know store zeros if you do not
have any other bit to store and when you
would perform ones complement on that
all the zeros would be converted to ones
and that's why we see a bunch of leading
ones here so that's it about bitwise
operators I hope you guys had fun
watching this tutorial you may subscribe
to my channel I'm going to see you in
the next video till then take care