Fortran Programming Tutorials (Revised) : 005 : Area of a triangle + Basic operators Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management

hello guys my name is Aaron and welcome
to my channel this series is a series of
tutorials on photon programming now in
the last tutorial we saw what
installation of Fortran in different
operating systems some introduction to
other Fortran compilers the how how to
write our first hello world program
expressions are both explanations about
implicit none the different identities
and in the exact in the immediately last
video we looked at how what are the
other online results that are available
for Fortran ok now in this program we
will start right will write our first we
will write a second Fortran program
where and we look at you know where and
we look at the applications of Fortran
you know with lot of features in it ok
in this program we will be trying to
calculate the area of a triangle using
Heron's formula ok for those of you guys
who haven't heard of it you gets type
Heron's formula or Heron's formula into
wiki or internet yeah ok it's showing me
we keep a Wikipedia page here ok
the area for triangle the is can be
given by this expression here the
capital is the area and the sites
small a small B and small C represent
sides of the triangle size a triangle as
you can see in this picture
ABC are the sides of the sides of a
triangle and if this being the case you
can find the area using this formula
where s is actually is actually the half
of this half of the perimeter a B a and
B and C are added and that is given by
half and that is being used there is
represented as yes and some times s is
called as semi perimeter because it's
half of the perimeter that way and if
you use this formula you can find area
and you know they're they're multiple
you know derived version of the formula
where they use the same and go on with
it but we will stick to the simple
simplified formula here let's not
complicate this with complicate that ok
we'll write our program what I did as I
already I just
the new project called ass triangle at
the score area and I just proceeded with
the zipper proceeded with the same
things we did the last time and I have
this file let's start with the comment
the program to find sorry
the parameter and area of triangle now
the reason why I like this term program
okay using a hero's formula okay the
reason why I like this program is
because it helps you to understand all
the basic operations that are available
except the modulus operation energy to
helps you do all the operations that are
available in Fortran in one shot okay
let's start writing the program okay the
what I do is that program the try
triangle the square area okay area and I
end the program here angular square area
okay and and a facial as mentioned in
the earlier we need the included and
statement so that the compiler plus not
assume it's as if the data type for
enables on its own then since we will be
using with only real numbers here so
you'll be using only simple numbers here
so that I will just take two integers
integers okay now if you don't have any
specific if you don't have any other
param any other attribute to the to your
integers meaning there are a few more
integer attributes that you can add two
integers or no like if you don't have
any all you can do is you can just type
the variable Tacitus or instead but if
you have any attributes it's better to
write two colons and then write a
variable variables on the right hand
side there's two 2 : symbol it's
actually an indication to separate the
attributes of the variable and the vary
name's okay so we need three variables a
b and c to store the sides we need yes
to calculate the seven parameter we need
P to calculate the perimeter and then we
need a we need a variable call this area
just find the area okay and that is all
we need now initially as for now let us
assume the area let's let us in the
sides of the triangle at a B 3 B 4 and C
B fight now if you guys who are good at
Pythagoras theorem and if you guys have
some basic mathematical of mental math
so you guys have some mathematical
exposure that you guys can say that this
is actually a right angle triangle with
the hypotenuse being the side being the
side side C so with this being said the
area of this triangle is actually the
product of these two sides a and B
divided by 2 so it's actually 6 units so
it's like easy to for easy to find now
yes can be per find found by the
notation yeah okay I write this in
brackets a plus B plus C divided by 2
divided by 2 and then P is given by 2 2
into S or else I'll also try this
another way P is actually a plus B plus
C and yes is actually the is actually
you know PD of a to P develop it to ya
perfect now a of this triangle is given
by this notice again by this notation
okay s into S minus a s minus a into S
minus B into a multiplied R times s
minus C the whole power 0.5
whole PowerPoint 5 and this is the a of
the triangle now if you want to print
this I use the print statement okay by
writing the print statement use print
give us space and then write the Aztec
symbol give a comma this asterisk means
the print this print statement does not
have any specific formatting there are a
few farm articles that you have used for
printing statements you're using the
print statement okay as of now we're not
going to use any file matrix so we just
tell the compiler that there does no
formatting with this Aztec symbol in
later tudor melee what we will see the
formatting okay now we type the area the
triangle is comma Qadir
okay let's implies that now let's run
this file now compile this and build
this yeah now we have a small issue here
it says that this value might turn into
be my turn to be a real number and we
are somehow using real to somehow the
addition operation here my turn that
nominal Tartar the integer into a real
that's what it's showing here and some
of the operations might turn the numbers
into real and it's getting converted
into integers we look at that we look we
look at this in the next tutorial now as
i've known to avoid this it's just a
warning it doesn't make any problem but
anyway sometimes there might be some
truncation errors and all I'll explain
you guys in the next tutorial now as of
now let's draw this would be real just
to be on the safe side okay and now
let's compile this now it shows no one
is no error so no problem then build
this I said execute this you're inside
of the triangle as six units perfect as
a spiral calculation now suppose you
want the perimeter of the triangle what
you do is that type print comma with
open double quotes
the perimeter of the triangle is comma
and then type P as simple as that now
instead of compiling and build is
building it in separate steps like um
compiled building and running this in
separate steps I can just do this in one
shot click this button and there you
have it the perimeter triangle is 12
units or the area of the triangle is 6
units
perfect and that's all I have for you
guys in this tutorial it's a really
short order light now in the next
tutorial we will see the reason why I
had to KY intentionally changes this
these variables are integer to reals
and we law I'll also explain you guys a
little more about how what what how the
operations are how these operations are
different and we will also look about
other features that are available in
Fortran the next tutorial ok so thank
you guys for watching see you guys in
the next tutorial bye guys