Fortran Programming Tutorials (Revised) : 030 : More on Select Case; nested if Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management

hello guys my name is Aaron and welcome
to my channel the series is either
tutorials on Fortran programming now in
this tutorial we will be looking at out
of the special type of solid case
feature that we haven't checked in the
last time okay
now in this program we will look at we
will look at a certain features you look
at the you look at this feature this
special silicate feature with an example
with the short example now in this
program what we'll do is that will be we
will be look we will be displaying the
weather of a day based on the
temperature and Rh and what are exactly
doing is that will get the temperature
Norwich for a particular day the RH
means relativity for a particular day
and then well we'll just say that the
weather is hot or sunny or in something
like weather the weather is freezing or
cold or warm or something like that or
if the humidity is dry or very little
dry Pleasant sweaty-ass so on for that
what I need is that my program starts
here I write the implicit down here
what I need is that I have an integer of
type of kind for C instead of this what
I can do is that is that I can equate
equal kind for like this okay but
instead instead instead I have another
option where and I can just put a star
and then write for as it is now I'm
making this as an alligator blurry and
the allocatable array so there will be
two arrays like only for temp temp and
harvest M stands for them for
temperature are for Irish for storing
the trainee humidity now I have a
character array okay this has to be and
now I have a character array each each
of length 10 empty and a Tifa storing
the string string and I for storing they
are deeper storing the string for
temperature not restoring the stream for
you know the relative humidity and what
I need is and I need an integer integer
of value and as simple as that now what
I do is that n stands for the number of
days we are going to get the data so I
am just writing print okay
and the number of H and then to the
number of the brackets days okay and
then let's see and I get I get a value
of y n using read yeah okay now I
allocate I allocate n values of temp and
and n values of r which okay and then
finally what they do say what I do at
the last is that let me just think let
me just think this through
let me just think this through okay I'm
gonna do locate temp and they already
been allocated I will be allocating that
here now what I have here is what I have
here is that I've used I used the
looping common looking variable to the
loop counter to get the value of the
temperature knowledge creation every day
okay so I don't get and using this print
statement display the statement and this
read statement to get there is a
temperature in our h1 by one and then
using the same kind of a do loop but in
stir inside I'm I'm using a statement
than a little state in statement and
inside my I have a second key the select
case now in this if statement in the
temp if somebody enters a temperature
less than minus 90 is just absolutely
they are absolutely not possible on
earth okay there may be in some other
planets here but not Wilson as of now
it's not possible on earth then the this
entire loop exits entire loop exits as
simple as that and and if this if this
is not true what it will do is that it
will just go through the select case I
want value of them now this is the
feature of it suppose if the value of
the temperature is less than 10 degree
Celsius let's say yeah you don't have to
give minus something too
I'll do is they put a call in the front
and right turn and it means that it this
will this this case will hold good for
all the values less than or equal to ten
okay and that being in the case let's
say that I like I like the temperatures
listening to be freezing
you know if it's ten it's very very cold
and about ten degrees it's at below so
let me say it just freezing to indicate
how cold it is but if you guys want you
can make subdivisions of this range to
make it simple to make you to fit your
convenience that doesn't matter now
suppose I said the conditions like
between 11 and 20 and you guys must
noticed this number of this number
should they should not overlap they
should be completely non overlapping so
make sure you guys take that into
consideration while doing the programs
and all okay now suppose if the cases
lie between eleven and twenty eleven
degrees I hate to anything says it's
still a little cold so I write the case
to be cold okay I say this thing were
able to be called if it's from 21 to 13
you know reasonably manageable for many
people so I write this to be warm and it
was really in 31 and 35 yeah it's hot
kind of heart so it'll start to get a
little more uncomfortable at this point
so I write it hot and if the case is
beyond that is do searches I don't have
to write in a polymer all have rows
right that 36 with the with the color
and saying it's very hot whereas the
default case okay think it's case
default I think if the let's the case
the default case is that I rather tighty
cuz I don't because if somebody and as a
temperature that doesn't fit in this
value and don't know where does it fit
anywhere else I just put the condition
to be no unknown okay similarly and this
go with this all happens in the new loop
only when this happens out perfectly
temperatures perfect I'm putting this
into another if statement nested ifs Ted
yesterday state another if statement in
the same if statement so this is like
nested if statement and it sure checks
whether the are it is greater than
hundred or less than 0 if these both of
these kids are practically not possible
at least are the at least at the surface
level okay iris cannot be greater than Z
less than 0 an RH if it's greater than 0
100 it'll be no closer for me that's all
you can say okay now that being the case
if this happens that this entire loop
exits and if that's not the NA riches of
finite value and I'm getting a condition
I'm setting conditions like this if it's
less than 20 I said to drive if it's 21
to 40 and had a little dry
similarly I presented pleasant sweaty
and harsh based on the other changes now
1460 is okay it's good for good for
everybody 61 the 80 makes people a
little sweaty
an 81 the bow is a little too hard for
people to tolerate and the case default
suppose if somebody it doesn't value
that doesnõt unknown it'll say case
default and then we lend this and select
wheel and we let this end select and
we'll do will we let these both those
statements are not okay and what we'll
do is that we you know do one end and we
do statement here so that everything
comes under this comes under this entire
loop this loop will print again and
again and till the valleys and so this
this farm adding variable I sorry this
farm at I instead of giving it a
separate command separate formal
statement or writing with your course
I'm writing this in a single line using
the star command store so this is
another feature I can take care of and
one more thing is that I'm actually
extending this line print statement in
three lines by using and at the front
and at the back at and at the front to
make sure that this line is actually a
continuation and it's not a sink and so
it's a single line but not a multiple
line now if I were to compile this I
still get an error possibly because I
haven't defined int i I ate so let me
just say I now if i just compile this
this is okay okay now let me see
if this let me see if this works
okay let me see what are the other
secret requires a case kala logical
expression
yes I forgot the the this this should be
you know I because he is company of
temper temper fight and there will be a
lot of values here so let me just put
temper high here and similarly RH I just
put them parfait here and similarly I
put them tough I hear and temper five
here I think this will come on front
yeah it was comfort
looks fine by the way this F fight is an
easy way to cross verify and verify the
compilations and good to work out ok now
before I write all of this innocent
before I do is do all the three lines of
commands to get all the values printer
there's another simple way to do that ok
what I do is that I just create a new
file and I save this okay can I say this
I say this the same file that we're
working at ok I save this file rather
not as such dot we're not the extension
started such what we're going to do we
are going to add a small shell script to
say run this program again and again so
that we don't have to write the commands
again and again and to project get the
printed an executed so what I do is that
I type T Fortran okay I'm going to
compile this so minus C in that weather
dot F 95 okay and then what I'm going to
do is that I'm going to list out a list
out all the files that have been created
okay and before that I'm going to remove
any file in this folder that starts with
O starts with an O and then any and then
any file that starts with has an
extension one-time extension Exe okay
then what I'm going to do I am going to
you know well Alex mean you guys what it
means I'll tell you guys in a minute
initially I've got Lester all the
continents in the folder and then I'm
going to remove all the object files and
exe files that are available and if
there
any mod files which you look at it and
we look at it after some time okay that
those will also be removed and what this
this command does is it lists again so
that we get a look idea of what's going
on and then we compile this file we
compile there's a Fortran file using
this - C compiler flag in G Fortran and
then I write G Fortran - oh and then
this will be this will give us all the
object files here so I'll just like
weather dot oh if this turns out to be
fine sorry and this object lock should
come at the last come here so - oh and
then I spent I'd rather not exe okay I
know if I print this it'll get LS it'll
show everything now what I do is that I
run this file dot exe as simple as that
now what is command what the shell
script does is that does everything
serially one by one so instead of you
know compounding this compile in this
cord removing all these variables
checking whether they are present or not
and then I make building this and
executing this at the last what you can
do is just write everything all the
comments that we like to do in one shake
a single script one single script and
run this again run this once and this
again again to get all the job done
properly so what I do is that if I just
click LS okay okay let me just use this
command again let me just use this to
clear again
okay this will be helpful there are two
LS we have this file call us whether dot
s such now to make it an executable or a
type is a type chmod seven seven five
seven seven seven
you can type seven five five or seven
seven five and all to do all the job but
777 is good I mean this is actually a
shell command to know make make the file
permissions executable C is to make the
file permissions you know read give the
file the file the functions to read
write and execute and now so it has I
mean it if you guys want to know more
about you can jealous checksum sure
Google aboard into no more this but I
said not just follow with me
they just type chmod 777 and then this
file name rather dot SH okay when you
click this link after this nothing
happen buddy we click LS it becomes a
red fight I mean green fight now what
happens is that to run all this and
execute all this what I have to do
instead of typing all the commands that
we have typed here what I can do is just
type bash bash where the daughter search
some in some compilers even as such that
bear such such a space bad weather dot I
says will do I have a bash compile as
I'm using bash or sometimes what he can
do is that I just like how another
executable does you can do this but I
prefer this one okay when I click enter
okay when I click enter it just says
that it just lists all the files that
are present in the folder and says that
this star daddy egg not no file called a
star no nothing like a exe files are
present no my files are present so it
prints out all the files that are
present and then in a compiles a program
to give me the city weather dot o and
then it executes the builds the file to
give us a rather dot exe okay and then
if we type the number of days let's say
let me just give for one day temperature
of the layer a sled say 25 and the RHS
about forty five let's say it prints the
day is warm and pleasant with the
temperature 25 degrees edges and it let
it really a 45 percent not bad right now
if I were to do all this again what I do
is that to compile build and execute all
this all have to do is it press this
again it will do it will do all the
prerequisite process that are done and
shows again now I have to do is that I
just enter today's the first day I have
a temperature of 40 and a surface of an
ALICE of 85 now it asked me for the
second day let me just say this say 25
sorry
fighting researches and artists like 10
okay now it's a day the day is a very
hard and harsh the temperature 40
degrees in relative humidity of 85
degrees 85 a person the second date says
in second race we're freezing and drive
the temperature of high degree searches
and the relative humidity of 10%
sounds cool huh now if you had to run
this again what you do is I click as
such and in this one how many times as
you want I'll just click one more time
and just click let's say 20 let's say 31
the artists about 20 the day is hot and
dry with the temperature 31 degrees I
saw that relative a bit of 20% well
that's all I have for you guys in this
tutorials now in the next tutorial on
words instead of typing everything here
all the commands here we Lucius is shell
scripting command shell scripting
program to make our life's a little more
easy and maybe the later case we look at
how to do all this and make make files
or not to make to make things even more
to make things even was it a little
easier to hear to do okay that's all I
have for you guys in this tutorial thank
you guys for watching and see you guys
the next tutorial bye