Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 032 : More on functions; using shell scripts
Fortran Programming Tutorials (Revised) : 032 : More on functions; using shell scripts Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 032 : More on functions; using shell scripts Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. What is Fortran programming? |  |
Ans. Fortran programming is a high-level programming language that is commonly used for scientific and engineering applications. It was developed in the 1950s and has been widely used in areas such as numerical computing, simulation, and computational physics. Fortran is known for its efficiency and performance in handling complex mathematical calculations.
| 2. How can I declare and define functions in Fortran? | |
Ans. In Fortran, functions can be declared and defined using the "FUNCTION" keyword. The syntax for declaring a function is:
FUNCTION function_name(argument_list) result(result_variable)
[declarations]
[executable statements]
END FUNCTION
Here, "function_name" is the name of the function, "argument_list" is the list of input arguments, "result_variable" is the variable that stores the result of the function. The declarations and executable statements inside the function define the behavior of the function.
| 3. Can I use Fortran functions in shell scripts? | |
Ans. Yes, you can use Fortran functions in shell scripts. To use Fortran functions in a shell script, you need to compile the Fortran source code into an executable file using a Fortran compiler. Once you have the executable file, you can call the Fortran function from the shell script by executing the executable file and passing the required arguments.
| 4. How can I manage databases in Fortran programming? | |
Ans. Fortran itself does not have built-in features for managing databases. However, you can use external libraries or interfaces, such as the ISO/IEC 9075 SQL standard, to interact with databases in Fortran. These libraries provide functions and subroutines that allow you to connect to databases, execute SQL queries, retrieve and manipulate data, and perform other database operations.
| 5. What are some commonly used database management systems that can be used with Fortran? | |
Ans. Some commonly used database management systems (DBMS) that can be used with Fortran include:
- MySQL: A popular open-source DBMS that provides a comprehensive set of features for managing relational databases.
- PostgreSQL: Another open-source DBMS that offers advanced features and supports a wide range of data types.
- SQLite: A lightweight and self-contained DBMS that is often used for embedded systems or small-scale applications.
- IBM DB2: A commercial DBMS that is known for its scalability and reliability, commonly used in enterprise-level applications.
These DBMSs can be accessed and utilized in Fortran programming through appropriate interfaces or libraries.
Text Transcript from Video
hello guys my name is Erin welcome to my
channel this series is a series of
tutorials and photon programming now in
the last tutorials last tutorial
tutorials we were seeing at how to use
functions and in that in those programs
we looked at how to define a function
within the program and that one outside
the program and how to call them
properly now this is just an extension
of it in this in this program I mean in
this video we will write the definition
of a function inside the program
definition itself here the program def
in the function definition is inside the
script inside the same script but
outside the program definition here the
function definition is outside the
program and it's applied linear new
script
okay and the only only other difference
difference is that difference is that
this program we will X we will write a
program function definition for a new
way for a new variable that will be
completely inside the program itself to
write that okay what do you do is that
you have to indicate to the probe
indicate to the compiler that they have
defining something inside the company
inside the program for that what you
need is that the you need the statement
called as keyword called as countries
now what contains says is that it
changed to the compiler that this
program contains literally contains
something inside and what does it now
not what contains actually says is that
by default it says that there is
something inside and what is inside what
can be inside can be a function can be a
function or a subroutine as simple only
those now with this with this being said
you can write we can write the
definition for a new function now this
new function will be will be will be the
area area of area for rectangle area for
you know rectangle now to make that
happen what I do is that I put a none
statement here and write an another on
statement here and I continue with the
same kerning with the same rectangle
or a rectangle square or a triangle or a
rectangle type s for square and T for a
triangle and R for I put an end here I
can do that in the next line and I'll
for try a rectangle okay now I let me
just make a few more Corrections to
Corrections here let me just copy this
and repeat this again because it'll be
very simple similar if this were to be R
and this were to be are okay now now I
need that I need to enter the sides of
the rectangle
okay I need to enter the size of the
rectangle so this has to be yell comma B
let's say that L comma B that's you know
okay let me put it as hell comma W and
then I give this name rec right okay I
think so I'm like a single functional
keyword I suppose I just write L comma W
here and then if you guys notice he
uttered if we added a declare declare
rect and yell cover W at the top since
practice an external variable we'll just
define correct here and then L comma W
here okay simple enough then now let's
define the area for a area here now
within this function here now real star
eight now function rekt rekt yellow
comma W now and function
correct okay now we write the implicit
statement yeah implicit man and then
real star eight that was it yeah they'll
star it intent in to indicate that these
variables are getting inside and will
not be modified at the end of the
program okay and then now I need a do I
need another variable no I don't need
now what I can do is that I can just
type this type this okay and write
equals L star W simple as that okay now
now that's all in you just for a quick
compilation quick compilation you don't
need I get I get a warning like this you
get a warning like this let's see what
the problem is it says from the
beginning that procedure act as an
explicit interface it must not have data
mistake ladder - okay
if that be okay now they say this means
this explains a lot what does it mean is
that if suppose if you valid well
intuitively speaking when you're
defining a function definition like this
or like this either outside the program
you are giving the key word external to
indicate that these are you know these
are these definitions are outside the
program so be the extra the uses of
external was legit but for direct since
this is inside the program okay
it does not need it does not need this
external key word because with because
the definition of this function rect is
within the program its scope of this
program so I will show an asset because
of which you don't need this key
whatsoever to compile this again I get a
different different ever let's see I get
a different error what does that mean
it's just say the procedure right
that interface
I think I think if I don't even need
this maybe let me just see yeah I don't
yeah surprising this is something I
didn't know of since I def I defied
function and everything it in the
program I don't even need to define that
function here I thought I mean
integrally speaking to be honest I
didn't even I didn't even realize this
but but for surprisingly this is a
learning experience for me too
so if suppose the inference we get here
is that suppose we are to define a
function within the program we don't
even need to explicitly you don't even
need to explicitly mention it here the
definition itself is implied implied
though it's implicit now and it's a
definition itself is implied now let's
run this run the same thing here but
before but first before we do this
instead of just doing the same routine
CAG written four-step method that we did
on the table okay let's run this with
the she'll run this in the shell method
we did the last second if one of the
previous tutorials okay I tried this as
areas dot s search I create a shell
filed with named areas that I search I
save it and then what I do is that I
clear the screen lists all the files
since I list all the files inside now I
remove all the files which have it's
have that extension dot o extension dot
exe and then extension of dot mod
because ended because in the future
files we might come across spice which
which have a definite which have an
extension that mod okay and then we list
the files to see what's going on and
then what I do is that I night key
Fortran underscore C and I have to or
else you know what they just copy/paste
this stuff
okay I don't know whether this was welt
or not okay
I'm being a little lazy here copy
control V okay and then let me just let
me just copy this again didn't yeah it
worked and then finally let me just copy
this control see is this again and it be
denied I just list the files in between
just to give an idea what's going on and
then I list this file again and then
finally this is this should be this
should be too easy to run and that's it
that's it now this will give us an idea
this will run the same thing now if I
were to click LS it will show me that
there is a address or that such file at
the bottom and let's do green white so
it's not an executable to cut to make it
execute we'll just take in the whole
tutorial type chmod 777 area dot areas
the search nothing happens but if you
look right if we list the pirate Britain
green
so whatever do is that I just have to
type bash bash areas that search I'll do
the same thing now with this now let me
give it now since it tested Squire and
trying last and let's take check for
that tangle IQ let me give so it works
fine so let me give a value 10 and then
thigh it should show me 50 yeah this is
the area of the square okay I think I
didn't write I didn't write it properly
oh yeah yeah right the sides are you
know cover W area area the square as I
draw 2 the square should be rectangular
now if you guys noticed this properly
now since I made this correction now I
have to compile this file again and then
build this file again and run this
executable again now the just for making
corrections I have to do this again and
again so but - but but this shell script
made our job much simple because we
don't need to do that we don't need to
do that all you have to do is just run
this command once then this command once
I'll take care of everything isn't it
it just takes care of everything so let
me give this command R again the seven
caps I give the same parameter spin and
flip I had a catalyst a value properly
now if I run this I'd run this let me
give a new library call as F he just
shows invalid opera option and
terminating the program perfect now
that's all I have for you guys in this
tutorial and this is how you guys define
an internal function and in an internal
function without any requirement for an
external external I'll definition at all
and this is how you guys learn function
now in the future tutorials we'll be
looking at some more interesting
examples of how to involve functions and
subroutines at all subroutines and all
and we'll jump into subroutines quickly
and that's all I have for you guys in
this tutorial thank you guys for
watching and see you guys next today I
hope you guys learned something but from
but honestly I learned something out of
this experience I learned something out
of this tutorial this this little thing
that you can define a function within
the keyword within the definition of a
program without having to define it
without having to declare it at the top
thank that's all that's all I have
that's all folks bye
channel this series is a series of
tutorials and photon programming now in
the last tutorials last tutorial
tutorials we were seeing at how to use
functions and in that in those programs
we looked at how to define a function
within the program and that one outside
the program and how to call them
properly now this is just an extension
of it in this in this program I mean in
this video we will write the definition
of a function inside the program
definition itself here the program def
in the function definition is inside the
script inside the same script but
outside the program definition here the
function definition is outside the
program and it's applied linear new
script
okay and the only only other difference
difference is that difference is that
this program we will X we will write a
program function definition for a new
way for a new variable that will be
completely inside the program itself to
write that okay what do you do is that
you have to indicate to the probe
indicate to the compiler that they have
defining something inside the company
inside the program for that what you
need is that the you need the statement
called as keyword called as countries
now what contains says is that it
changed to the compiler that this
program contains literally contains
something inside and what does it now
not what contains actually says is that
by default it says that there is
something inside and what is inside what
can be inside can be a function can be a
function or a subroutine as simple only
those now with this with this being said
you can write we can write the
definition for a new function now this
new function will be will be will be the
area area of area for rectangle area for
you know rectangle now to make that
happen what I do is that I put a none
statement here and write an another on
statement here and I continue with the
same kerning with the same rectangle
or a rectangle square or a triangle or a
rectangle type s for square and T for a
triangle and R for I put an end here I
can do that in the next line and I'll
for try a rectangle okay now I let me
just make a few more Corrections to
Corrections here let me just copy this
and repeat this again because it'll be
very simple similar if this were to be R
and this were to be are okay now now I
need that I need to enter the sides of
the rectangle
okay I need to enter the size of the
rectangle so this has to be yell comma B
let's say that L comma B that's you know
okay let me put it as hell comma W and
then I give this name rec right okay I
think so I'm like a single functional
keyword I suppose I just write L comma W
here and then if you guys notice he
uttered if we added a declare declare
rect and yell cover W at the top since
practice an external variable we'll just
define correct here and then L comma W
here okay simple enough then now let's
define the area for a area here now
within this function here now real star
eight now function rekt rekt yellow
comma W now and function
correct okay now we write the implicit
statement yeah implicit man and then
real star eight that was it yeah they'll
star it intent in to indicate that these
variables are getting inside and will
not be modified at the end of the
program okay and then now I need a do I
need another variable no I don't need
now what I can do is that I can just
type this type this okay and write
equals L star W simple as that okay now
now that's all in you just for a quick
compilation quick compilation you don't
need I get I get a warning like this you
get a warning like this let's see what
the problem is it says from the
beginning that procedure act as an
explicit interface it must not have data
mistake ladder - okay
if that be okay now they say this means
this explains a lot what does it mean is
that if suppose if you valid well
intuitively speaking when you're
defining a function definition like this
or like this either outside the program
you are giving the key word external to
indicate that these are you know these
are these definitions are outside the
program so be the extra the uses of
external was legit but for direct since
this is inside the program okay
it does not need it does not need this
external key word because with because
the definition of this function rect is
within the program its scope of this
program so I will show an asset because
of which you don't need this key
whatsoever to compile this again I get a
different different ever let's see I get
a different error what does that mean
it's just say the procedure right
that interface
I think I think if I don't even need
this maybe let me just see yeah I don't
yeah surprising this is something I
didn't know of since I def I defied
function and everything it in the
program I don't even need to define that
function here I thought I mean
integrally speaking to be honest I
didn't even I didn't even realize this
but but for surprisingly this is a
learning experience for me too
so if suppose the inference we get here
is that suppose we are to define a
function within the program we don't
even need to explicitly you don't even
need to explicitly mention it here the
definition itself is implied implied
though it's implicit now and it's a
definition itself is implied now let's
run this run the same thing here but
before but first before we do this
instead of just doing the same routine
CAG written four-step method that we did
on the table okay let's run this with
the she'll run this in the shell method
we did the last second if one of the
previous tutorials okay I tried this as
areas dot s search I create a shell
filed with named areas that I search I
save it and then what I do is that I
clear the screen lists all the files
since I list all the files inside now I
remove all the files which have it's
have that extension dot o extension dot
exe and then extension of dot mod
because ended because in the future
files we might come across spice which
which have a definite which have an
extension that mod okay and then we list
the files to see what's going on and
then what I do is that I night key
Fortran underscore C and I have to or
else you know what they just copy/paste
this stuff
okay I don't know whether this was welt
or not okay
I'm being a little lazy here copy
control V okay and then let me just let
me just copy this again didn't yeah it
worked and then finally let me just copy
this control see is this again and it be
denied I just list the files in between
just to give an idea what's going on and
then I list this file again and then
finally this is this should be this
should be too easy to run and that's it
that's it now this will give us an idea
this will run the same thing now if I
were to click LS it will show me that
there is a address or that such file at
the bottom and let's do green white so
it's not an executable to cut to make it
execute we'll just take in the whole
tutorial type chmod 777 area dot areas
the search nothing happens but if you
look right if we list the pirate Britain
green
so whatever do is that I just have to
type bash bash areas that search I'll do
the same thing now with this now let me
give it now since it tested Squire and
trying last and let's take check for
that tangle IQ let me give so it works
fine so let me give a value 10 and then
thigh it should show me 50 yeah this is
the area of the square okay I think I
didn't write I didn't write it properly
oh yeah yeah right the sides are you
know cover W area area the square as I
draw 2 the square should be rectangular
now if you guys noticed this properly
now since I made this correction now I
have to compile this file again and then
build this file again and run this
executable again now the just for making
corrections I have to do this again and
again so but - but but this shell script
made our job much simple because we
don't need to do that we don't need to
do that all you have to do is just run
this command once then this command once
I'll take care of everything isn't it
it just takes care of everything so let
me give this command R again the seven
caps I give the same parameter spin and
flip I had a catalyst a value properly
now if I run this I'd run this let me
give a new library call as F he just
shows invalid opera option and
terminating the program perfect now
that's all I have for you guys in this
tutorial and this is how you guys define
an internal function and in an internal
function without any requirement for an
external external I'll definition at all
and this is how you guys learn function
now in the future tutorials we'll be
looking at some more interesting
examples of how to involve functions and
subroutines at all subroutines and all
and we'll jump into subroutines quickly
and that's all I have for you guys in
this tutorial thank you guys for
watching and see you guys next today I
hope you guys learned something but from
but honestly I learned something out of
this experience I learned something out
of this tutorial this this little thing
that you can define a function within
the keyword within the definition of a
program without having to define it
without having to declare it at the top
thank that's all that's all I have
that's all folks bye
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