Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 034 : Problems with calling functions defined in a program
Fortran Programming Tutorials (Revised) : 034 : Problems with calling functions defined in a program Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 034 : Problems with calling functions defined in a program Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. What are some common problems that can occur when calling functions defined in a Fortran program? |  |
Ans. Some common problems that can occur when calling functions in Fortran programs include:
- Incorrectly passing arguments to the function, leading to unexpected results or errors.
- Forgetting to include the function declaration or interface in the calling program, causing the compiler to not recognize the function.
- Mismatched data types between the function declaration and the actual arguments, resulting in type conversion errors.
- Not properly initializing variables before passing them to the function, leading to undefined behavior.
- Forgetting to assign the returned value of the function to a variable, resulting in loss of the computed result.
| 2. How can I ensure that I am calling a function correctly in my Fortran program? | |
Ans. To ensure that you are calling a function correctly in your Fortran program, you can follow these steps:
- Make sure to include the function declaration or interface in the calling program, specifying the function name, return type, and argument list.
- Check that the arguments you are passing to the function match the expected data types and order specified in the function declaration or interface.
- Ensure that all variables passed to the function are properly initialized before the function call.
- Assign the returned value of the function to a variable or use it in your program as needed.
- Use appropriate error handling techniques to catch and handle any potential errors that may occur during the function call.
| 3. Can I call a Fortran function from another programming language? | |
Ans. Yes, you can call a Fortran function from another programming language. Fortran provides interoperability features that allow functions to be called from other programming languages, such as C or C++. This can be achieved by using the appropriate language bindings or interface definitions. For example, in C, you can use the "extern" keyword to declare the Fortran function and then call it like any other C function. However, it is important to ensure that the function's arguments and return types are properly handled and compatible between the languages to avoid any data type or memory-related issues.
| 4. What should I do if I encounter a "function not defined" error when calling a function in my Fortran program? | |
Ans. If you encounter a "function not defined" error when calling a function in your Fortran program, you should check the following:
- Make sure that the function is defined in the program or module where you are calling it from. If it is defined in a separate module, ensure that the module is properly included or imported.
- Check for any spelling mistakes or typographical errors in the function name or its declaration.
- Verify that the function's declaration or interface is visible to the calling program by checking the use of appropriate "use" or "include" statements.
- Ensure that the function's declaration or interface matches the actual function definition, including the correct number and types of arguments.
| 5. How can I debug issues related to calling functions in my Fortran program? | |
Ans. To debug issues related to calling functions in your Fortran program, you can use the following techniques:
- Use a debugger, such as gdb or a Fortran-specific debugger, to step through your program and track the execution flow. This can help identify any issues or errors during the function call.
- Print out intermediate values or debug statements before and after the function call to verify the correctness of the data being passed.
- Check for any error codes or error messages returned by the function and handle them appropriately.
- Review the function's documentation or source code to understand its expected behavior and usage.
- Seek help from online communities or forums dedicated to Fortran programming, where experienced users can provide guidance and insights into common issues with function calls.
Text Transcript from Video
hey guys my name is Aaron and welcome to
my channel this series is a Cesar
returns and Fortran programming now in
the last tutorial what we saw is that
visa to write the right recursive
functions and how to call one function
inside the other and the other and
another related stuff now in this
tutorial we'll be seeing as to how to
call how to know is there any other
possibility to call to write the
function definition inside the program
inside the program and try to well let's
try to call it with other functions so
what I do is that let me just call this
function here this is fat function we
just cut this up save it here okay and
then I write it inside this function
definition like this and I take this
keywords off so that I'm indicating to
the program indicating to the following
compiler that this entire program has
contains this function okay and now this
part has to be a slightly tabbed out to
make it fit in this region all of this
has to be tabbed one must place so that
everything has event nice now what you
do is that is the same program but we
just remove that function or from the
from here we put it over here so
fortunately this should work now will it
work let's see just let me clear all
this content over here let me write this
out - yeah I forgot to write me run this
okay let me see what what it shows it
show it it shows all the files are
available it shows that there isn't any
mod file that's okay and then this line
it shows it just lists all the files and
in this line we get all that dot alpha
is available that's fine so it means the
compilation goes fine
but afterwards it just shows indication
saying that there's an undefined
reference to fat underscore and all and
that being said he does it shows an
error that
early returned one exit status it shows
here that Paradis komtar countered exe
no file are no file such file our
dietary exist and all when we list this
file we start with when we do is this
file okay during the build process there
is there isn't any executable file that
is present so meaning the compilation
worked out fine the removal of dot fine
the execution will what is not working
because it shows that there is no
parking there's a gerbil has not been
generated and if you guys look at this
lists list line over here it lists all
the files but if you guys noticed there
isn't any executable file here now the
problem that comes here is that the
comparison works fine now the problem is
in the build
now let us troubleshoot this suppose
maybe maybe the order might matter let's
say so I ought to do is that I just
right welcome come dot o because all
these functions define in this defined
in this program defined in this path but
in this file needs this factorial
suppose if you had to run this first
compile this with uncompromised this
object file with this object file you
may not get the issue you may get
another so what I do is that I just do
compare for not this first and then fact
hunk o compile this out
and let me see whether if I get some
problem yes I get the similar problem
now what could be the reason of it it I
think it I think it's possibly become I
believe hunch is that it's possibly
because possible because of this
definition inside the main program what
do you do let me just cut this okay to
ensure that this is not this is because
of the definition inside the main
program let me just print it let me
describe the type this below and you
know said this
dabbing straight said should they try
out our staff sit straight and to make
sure that this does not hinder what I do
is that I just come in this entire line
not yeah and a shell script if you want
to comment certain lines out you have to
put a stem put a hash symbol at the
front what I do we just repeat this but
I just take this hash of it and then
what I do is that I remove all this and
I put the star datos to make the
compilation go I on its own means the
building on go on its own now what I do
is that let me run this Furcal script
again huh now if you guys notice it
worked out fine another pretty fine and
it's sure it's the executable is made
and it's active and waiting for us to
give an answer let me give you 16 for N
and 3 for R and it works fine if I were
to run this again this time let me give
a different value like 3 and RS 16 I get
a segmentation fault core dumped error
because you know 3/16 maybe a little and
I mean 3 double 16 is 0 not the integer
vices kind of 0 and you guys notice for
negative numbers the factorial is hard
to comprehend and you might have a
little different different dances enough
and I don't know if at all does not hold
good or not something of that something
of that sort
anyway that's just that's the fact
suppose you were to compare this with
another very like Phi and - yeah they're
getting a good answer right now this now
from this example we are coming with the
conclusion suppose if we were to define
suppose if you were to define a program
definition a function definition or in
the future for that matter even a
subroutine definition such that the dad
said those definitions are placed inside
the program then those function those
functions are subroutine definitions
become a part of the program and they be
they not accessible to other functions
and subroutines
okay on the other hand if I were to
write that
right the same definition outside the
program either in the same script are on
a different script those functions
become available for all the functions
that are under consideration now if I
were to write everything that that if I
were to write all of this okay all of
this in the same function sorry in the
same file like this and go ahead with it
now that one this is the most
advantageous method because if this set
of functions I can Club this with any
other program that I weren't and these
functions are size defined such that you
know you can use this in any program of
your choice if you have to write if you
have to write the function FS is here
only those prog only those five function
that are available within the project
they can be used other than that this is
the most advantageous method okay now
this is something have to keep in mind
and I think this applies to four
subroutines as well and that's all I
have for you guys in this tutorial you
possibly in the next tutorial we'll be
looking at subroutines and modules and
modules and and then we look at little
more of comp little more complicated
examples on how to how to use factorials
sorry how to use submarines and
functions for little more complicated
purposes and thank you guys for watching
hope you guys learn something from this
video
deucey and I forgot please do subscribe
to my channel and see you guys next
tutorial bye
my channel this series is a Cesar
returns and Fortran programming now in
the last tutorial what we saw is that
visa to write the right recursive
functions and how to call one function
inside the other and the other and
another related stuff now in this
tutorial we'll be seeing as to how to
call how to know is there any other
possibility to call to write the
function definition inside the program
inside the program and try to well let's
try to call it with other functions so
what I do is that let me just call this
function here this is fat function we
just cut this up save it here okay and
then I write it inside this function
definition like this and I take this
keywords off so that I'm indicating to
the program indicating to the following
compiler that this entire program has
contains this function okay and now this
part has to be a slightly tabbed out to
make it fit in this region all of this
has to be tabbed one must place so that
everything has event nice now what you
do is that is the same program but we
just remove that function or from the
from here we put it over here so
fortunately this should work now will it
work let's see just let me clear all
this content over here let me write this
out - yeah I forgot to write me run this
okay let me see what what it shows it
show it it shows all the files are
available it shows that there isn't any
mod file that's okay and then this line
it shows it just lists all the files and
in this line we get all that dot alpha
is available that's fine so it means the
compilation goes fine
but afterwards it just shows indication
saying that there's an undefined
reference to fat underscore and all and
that being said he does it shows an
error that
early returned one exit status it shows
here that Paradis komtar countered exe
no file are no file such file our
dietary exist and all when we list this
file we start with when we do is this
file okay during the build process there
is there isn't any executable file that
is present so meaning the compilation
worked out fine the removal of dot fine
the execution will what is not working
because it shows that there is no
parking there's a gerbil has not been
generated and if you guys look at this
lists list line over here it lists all
the files but if you guys noticed there
isn't any executable file here now the
problem that comes here is that the
comparison works fine now the problem is
in the build
now let us troubleshoot this suppose
maybe maybe the order might matter let's
say so I ought to do is that I just
right welcome come dot o because all
these functions define in this defined
in this program defined in this path but
in this file needs this factorial
suppose if you had to run this first
compile this with uncompromised this
object file with this object file you
may not get the issue you may get
another so what I do is that I just do
compare for not this first and then fact
hunk o compile this out
and let me see whether if I get some
problem yes I get the similar problem
now what could be the reason of it it I
think it I think it's possibly become I
believe hunch is that it's possibly
because possible because of this
definition inside the main program what
do you do let me just cut this okay to
ensure that this is not this is because
of the definition inside the main
program let me just print it let me
describe the type this below and you
know said this
dabbing straight said should they try
out our staff sit straight and to make
sure that this does not hinder what I do
is that I just come in this entire line
not yeah and a shell script if you want
to comment certain lines out you have to
put a stem put a hash symbol at the
front what I do we just repeat this but
I just take this hash of it and then
what I do is that I remove all this and
I put the star datos to make the
compilation go I on its own means the
building on go on its own now what I do
is that let me run this Furcal script
again huh now if you guys notice it
worked out fine another pretty fine and
it's sure it's the executable is made
and it's active and waiting for us to
give an answer let me give you 16 for N
and 3 for R and it works fine if I were
to run this again this time let me give
a different value like 3 and RS 16 I get
a segmentation fault core dumped error
because you know 3/16 maybe a little and
I mean 3 double 16 is 0 not the integer
vices kind of 0 and you guys notice for
negative numbers the factorial is hard
to comprehend and you might have a
little different different dances enough
and I don't know if at all does not hold
good or not something of that something
of that sort
anyway that's just that's the fact
suppose you were to compare this with
another very like Phi and - yeah they're
getting a good answer right now this now
from this example we are coming with the
conclusion suppose if we were to define
suppose if you were to define a program
definition a function definition or in
the future for that matter even a
subroutine definition such that the dad
said those definitions are placed inside
the program then those function those
functions are subroutine definitions
become a part of the program and they be
they not accessible to other functions
and subroutines
okay on the other hand if I were to
write that
right the same definition outside the
program either in the same script are on
a different script those functions
become available for all the functions
that are under consideration now if I
were to write everything that that if I
were to write all of this okay all of
this in the same function sorry in the
same file like this and go ahead with it
now that one this is the most
advantageous method because if this set
of functions I can Club this with any
other program that I weren't and these
functions are size defined such that you
know you can use this in any program of
your choice if you have to write if you
have to write the function FS is here
only those prog only those five function
that are available within the project
they can be used other than that this is
the most advantageous method okay now
this is something have to keep in mind
and I think this applies to four
subroutines as well and that's all I
have for you guys in this tutorial you
possibly in the next tutorial we'll be
looking at subroutines and modules and
modules and and then we look at little
more of comp little more complicated
examples on how to how to use factorials
sorry how to use submarines and
functions for little more complicated
purposes and thank you guys for watching
hope you guys learn something from this
video
deucey and I forgot please do subscribe
to my channel and see you guys next
tutorial bye
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Dec 28, 2024 Last updated |
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