Advanced Fortran Programming : 002 : String Operations Video Lecture | Introduction to Fortran Programming (AdvancedLevel) - Database Management

hello guys my name is Aaron and welcome
to my channel this series is a series of
tutorials on Fortran advanced Fortran
programming now in this tutorial we'll
be looking at some of the string
operation functions or string processing
functions available in Fortran we'll be
concentrating on let's see three
functions namely trim our just L and Len
function and also we will see how to
concatenate strings in today in today's
example no now now let's begin our
program directly I have a program named
STR STR vez okay and I have written a
small shell script here to run it this
program will be individual so all we
need is that we just need this function
and this has to be executed to produce
me a bill to produce an executable and
then executable runs here so this is the
shell script it's ready and all this
file is returning no actually I don't
know whether you can see this eyelet
setter
in my desktop and then I created a
folder called a string underscore funks
in the inside that it's available ok
let's start our job I need a character
okay
character character recall this name
name 10 name 1 which is of 10 length 10
units long and I assign it to a name
called say Fortran just like that and
with the space at the end this is
important and then and sorry and the
space at the front also I'll explain
this this spaces will be helpful and
then name 2.10 ok equals let's say equal
equally comparable language C++ okay and
then name 3 dot okay I'll limit name 6
I'll explain you guys right okay name
six and then this line is getting full
so let me just write a new one name 3
star 20 this should be 20 units long
named for star 20 this is another 20
minutes long and then name five which is
actually 10 units long
okay and this should be equal to sorry
space string space yes space okay now
let us define two formats I've already
defined the farmers over here let me
just copy and paste it here okay
farmer 10 Prince named one with the
number this like this okay this is
something to be considered most 810
stands for a character of 10 units long
I a stands for integer of just I stands
for integer and this one stands for one
value like that you guys - when I print
these you guys this you get to see what
we how this works
okay now I'm printing the print
statement okay this print statement has
to follow the format ten so I should
enter an integer first so let me put
this one okay and then I take name one
okay - name - okay now let's see how
these get how this gets printed now they
were to run the shell script over here
okay run the shell script of okay let me
just run the same script / - start a
search yeah it prints like this ignore
about these destin ILS func LS command
functions that are more functions and
all ignore about these okay thanks it
produces an executable and it prints
space Fortran but some spaces but
following that and then the name and if
you guys if you guys can notice properly
there's a space for oh there's a space
of P and there's a space here okay
and this space if you guys let's see
this one written properly okay
I keep it over here if you guys look at
you guys look at here the one space
comes because of this space over here
okay other than that it's prints in a 10
units 10 units location okay now let's
see how this goes different suppose if I
were to concatenate two strings as it is
this the concatenation operation is
given by two slashes okay
suppose if I write name one slash last
name - then what will happen is that it
will just concatenate both these strings
and now let's print the these but before
that there is this one I'll explain a
function there's one more function
well there's one function called a
string what this does is that it just
trims the spaces in the come in the line
before and after the func refer after
the names to print it a print to allow
to allow you know concatenation properly
so what they do is they just stripe trim
off me one and then double backslashes
and then trim off name - okay and then
name six equals I just L name fight I'll
explain what Nick what this is okay now
I just L or if secondo command use used
for adjusting the length of the pro
length of the string what it does is
that it just removes the trailing spaces
- from the front and at the back of the
number of the strings okay
and the only those trailing spaces that
come that come because of the formatting
okay
that alone is present whereas trim
removes all the trailing spaces at the
front and at the back of the file back
of the string and that's the job
accordingly
okay now let's print all this print all
this now and also there is one more
command called as
Len okay okay okay
I'll explain yeah we are printing
strings three and four using this tenth
format xx format and using printing for
name five and six using farmer ten okay
and then I'm printing the length of this
particular string using this Len command
and this Len command should return okay
one two three string the six letters
long
this ss7 there's a space in here this is
space over here this triplet until nine
okay I forgot to execute this perfect
water says is that if you guys notice
there I've lead a lot of trailing spaces
here and there's space in the front okay
name one is printed a citrus name too is
printed I see this with the lot of
spaces there like seven spaces over here
that's why I put this underscore check
here okay to indicate that a lot of lot
of trailing spaces for this string okay
when you merge these two strings in name
three without having any adjustment
without having any trimming this space
is because of the leading spaces
available in Fortran and trailing spaces
and this space is also because of
leading space available but once you
trim them when to use the trim command
to concatenate the strings all the
spaces get trimmed off and they print
and they gets printed nicely okay the
trade the leading space all gets printed
but you know this guy is kind of you
know he goes handle this kind of goes
like that okay sometimes the leading
space won't work but you know spaces in
between strings they'll if they're going
there and run got an concatenation now
they'll just swap out fine okay
and then if you guys look at this okay
the leading space in the leading space
and I just L is this one leading space
over here and this leading space it gets
removed in this progress in this line
where after using this are just L
commander are just length command and
then finally the length of the string is
you know nine units
why this many spaces formatting issue
nothing more all right now
not done with done with this tutorial
yet okay there is this one more concept
I have to tell today you can not only
print entire strings but you can print
fractions of the strings also okay for
instance in here I'm printing and tag
name one which is actually Fortran with
all the front space and backspace is
included okay
this here I'm printing on printing all
the values from the front till the sixth
character and here I'm printing all the
values from six-carat till the end of
the string and here I'm just printing
the character four five six and seven
here okay now if I were to run this you
guys see the difference here it means
entire string here it prints only six
characters here everything else from six
quatre till the end four five six seven
characters fourth fourth sixth and
seventh characters alone here okay this
way you can print a fraction of the
strings also in this method okay now
that's all I have for you guys in this
tutorial and this this kind of I'm sorry
this kind of string operations are very
much helpful while managing files and
other stuff okay so you may not have a
good use of it right now but maybe in
the distant distant future where then
you might be working with functions and
all to manage file names to date for
some data processing where you have two
artists with strings play with strings
and all this will be really useful so
this is something to look at okay
and suppose you want to sorry because
you want to know save certain files to
let's say you want to save certain files
and do some file management journal read
read a lot of files which have some kind
of common name and they want to generate
something out of it no this will be
really useful and maybe in one of the
future tutorials we will be using I'll
think of some example where and we can
use these tools we learnt here and put
them into proper use okay that's all I
have for you guys in this tutorial thank
you guys for watching and
you guys next day