Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 020 : Cautions in do loops; Labels
Fortran Programming Tutorials (Revised) : 020 : Cautions in do loops; Labels Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 020 : Cautions in do loops; Labels Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. What are some common cautions to consider when using do loops in Fortran programming? |  |
Ans. Some common cautions when using do loops in Fortran programming include:
- Ensuring that the loop control variables are properly initialized before entering the loop.
- Avoiding infinite loops by ensuring that the loop termination condition is correctly defined.
- Being cautious when using nested do loops to avoid confusion and potential errors.
- Paying attention to the loop index values to prevent index out of bounds errors.
- Being aware of the performance implications of the loop structure and optimizing it if necessary.
| 2. How can I manage a database in Fortran programming? | |
Ans. In Fortran programming, database management can be achieved by using external libraries or implementing custom solutions. Some approaches to manage a database in Fortran include:
- Utilizing SQL database systems and connecting to them using Fortran interfaces or libraries.
- Implementing custom file-based databases where data is stored in structured files and accessed using Fortran file I/O operations.
- Using Fortran's built-in array and data structure capabilities to create in-memory databases for efficient data manipulation.
- Employing Fortran's string handling capabilities to parse and process data stored in text-based database files.
- Integrating Fortran with other programming languages or tools that provide database management capabilities, such as Python with its database libraries.
| 3. What are some important considerations when designing a database management system in Fortran? | |
Ans. When designing a database management system in Fortran, some important considerations include:
- Determining the data model and structure that best suits the application's requirements.
- Defining appropriate indexing and querying mechanisms to efficiently retrieve data.
- Ensuring data integrity and consistency by implementing proper validation and constraint checks.
- Considering security measures to protect sensitive data from unauthorized access or modification.
- Optimizing database performance by carefully designing the storage and retrieval processes.
- Planning for scalability and extensibility to accommodate future growth and evolving requirements.
- Providing error-handling mechanisms to gracefully handle exceptions and ensure reliable operation.
- Documenting the database schema and providing clear guidelines for database maintenance and updates.
| 4. What are the benefits of using do loops in Fortran programming? | |
Ans. The benefits of using do loops in Fortran programming include:
- Simplifying repetitive tasks by encapsulating them within a loop construct.
- Improving code readability and maintainability by reducing code duplication.
- Enabling efficient processing of large arrays or data sets by iterating over them with a loop.
- Allowing for flexible control of loop iterations using loop control variables and termination conditions.
- Facilitating the implementation of complex algorithms that require repetitive computation.
- Enhancing code modularity by encapsulating specific operations within a loop body.
- Providing a structured approach to iterate over data and perform consistent operations on each element.
| 5. Are there any potential performance issues to consider when using do loops in Fortran programming? | |
Ans. Yes, there can be potential performance issues to consider when using do loops in Fortran programming. Some key factors to be mindful of include:
- The overhead of loop initialization and termination can become significant if the loop is executed many times.
- Nested do loops can lead to increased execution time, especially if they are deeply nested.
- Inefficient loop indexing or excessive use of loop control variables can impact performance.
- Unoptimized loop operations, such as unnecessary calculations or redundant assignments, can introduce inefficiencies.
- Memory access patterns within the loop can affect cache utilization and impact performance.
- Loop unrolling or vectorization techniques may be necessary to fully utilize CPU capabilities and improve performance.
- Benchmarking and profiling tools can help identify performance bottlenecks within do loops and guide optimization efforts.
Text Transcript from Video
hey guys my name is Aaron and welcome to
my channel this series is a series of
tutorials on Fortran programming now in
the last tutorial we were completely
successfully completed our successful
for the factorial program and in this
tutorial we I will be telling you guys a
little more details regarding some
factors that have to consider while
doing a do loop and we'll talk about
labels also now what does what are the
factors to be considered in do loop is
as follows first of all first of all the
do loops should be should be sandwiched
inside each other now what does that
mean
I'll tell you like this I'll tell you
for I'll tell you this in Genii and
other editors if you have a laser and we
go to interactive development
environment editors like Jeannie or
maybe more than that this is feature car
this is feature like this called as a
collapse feature okay
this collapse feature helps you to know
which face which features inside which
feature and roll now the what I mean by
sandwich is that whenever we would write
a new loop or a nested do loop 1 loop
should like completely inside the other
other loop and if this feature is not
being obeyed properly then you're then
the result will not and then the program
will throw an error and will not run
properly so that is first that is the
first thing at the consider second thing
you have to consider is that you can use
the values of the I iterating variable
but it should not be the valleys of the
hydrating they should not be modified
for instance in this loop what I know
what I feel what I can say is that I
value and I'm just using the value of I
but I'm not changing the value of I
similarly in this inside this J inside
this go to loop I'm using the value of J
but I'm not modifying the value of J
similarly here I'm reducing the value of
I but I'm not modifying the value of I
so as far this goes by you can use very
well the hydrating variables but it
cannot modify the variables inside for
instance let me just keep I equals one
now I just said I equals four in a
sudden look I just raises up compared
this
they'll throw me never look at if it's
shows and ever saying that error
variable I at one where this is one this
showing at one cannot be redefined
inside blue beginning at two so this is
the warning this is another one this in
error we won't let you come it won't
even let it compile so this is a
compilation error which you have to fix
this I wish it won't let it's a kind of
an L is a big error in Fortran so what I
have to do is that this if this being
said either value of I cannot be
modified inside its own loop outside the
loop it can not you can modify the N
number of times it doesn't matter but
inside the loop where where it is being
used as a nitrating variable i cannot be
modified okay so you have to comment
this and compare this it works fine no
problem now on the other hand okay if i
were to modify j suppose I said J equals
J equals three okay compile this it
won't throw me another why so because J
is local to this loop and outside this
loop you go outside with this loop J has
no conditions on it okay so this works
fine this this is this one throw mean
error so this I say this is an error
this has no error okay now here suppose
if I had to make this statement I equals
one I equals one you know I'm
intentionally modifying to modify this
here again if I compile this
it will throw me the same error because
I though it's inside this J loop it is
also this entire J loop is inside I saw
implicit indirectly or implicitly I is
also inside I I this I is also inside
this I loop because I this do loop with
having I so this is not accepted there
were to compare compare this with after
commenting this or this fine and if I
try to do the same thing I did over
there J equals three okay they throw me
another as passed earlier as before but
if I were to you
you know comment this out this on throw
me know
I just step no better I favored to
compare this no issues no issues
whatsoever and if I do that okay
since IJ is being reassigned here it
doesn't matter what J holds whatever it
holds about will be just removed will be
just wiped up and set over here so these
are the cautions you have to take inside
using do loops and all and next thing I
want to tell you guys is about the
labels now what a label is ask them as
the name suggests it just a name or a
kind of a label for the further
statements now labels are most
preferably used for looping statements
and other decision making statements now
if you want to write a loop right if you
want to write a label whatever you do
just give a name like outer how do how
to do loop something like that and then
to make sure that this is a loop you
give this colon symbol similarly if you
want if I want to give an inner if you
want to give her an inner state a label
for this loop I can write something like
in the loop and give a colon and
separate this out as simple as that but
this label convention comes up with
slight consequence see once you start
naming them okay okay you just print if
you just compile this it will throw a
lot of warning stating that an expected
end Dukas are carrying expanded into is
occurring and unexplained next bit
identified and the lot of stuff now what
does this mean is that you guys notice
it's underlining all the endo statements
and n program statements stating that
there is some kind of an error we didn't
notice any error in the previous because
condition so what does this mean it
means that initially when the do loops
do not have a name the compiler know
knows how to terminate them and how to
terminate them properly and all it does
use on its own but it which works out to
be fine
but then when the naming conventions are
given now you have to explicitly define
various loop is ending now
now to make sure this works properly I
have to sorry I I thought it cited in
its inter I thought I thought I thought
it was in there it's actually no it's
inter I type in ER in a do loop okay and
then I type out how to loop okay now
this indicate this indicates that the
inner loop starts here and ends here and
then City case the outer loop starts
here and ends here if you guys noticed
this just like the program name I gave a
program here and ending with the
programming here just like that just
like that now if I were to compile this
no errors okay now if I told you that
the one the loop has to be sandwiched in
between the loops right now
what if I do not sandwich if I just you
know I write this as outer outer outer
and I write this as in inner okay now
bash for this kind as per the naming
conventions the compiler will assume
that the compiler will take the outer do
loop ten here an inner inner to obtain
here so they are overlapping each other
they not going interested they are not
you know sandwich didn't say they're
actually overlapping each other so if I
were to compare this you throw an hour
it'll throw the never setting that
unexpected looping unexpected endings
endings are coming up okay and it's not
matching up with how things are going
over here and all okay now that being
said this is how now that being said
this is an indication that you know you
should not have you should not have
overlapping glows but one loop should be
inside the other or nested in chart okay
loops can be nested but it cannot be you
know the loops can be nested but it
cannot be overlapping with other loops
and that's the thing over here if I were
to rectify that issue if I this issue
and then compile this it works no error
no other I build this now I just execute
this I just type you know say it then
there you have it it works fine the
program is working fine perfect now
things we don't need the statement so I
just come with this out and then save it
no problem I use compiled build and it
sorry
I just execute this ten perfect that
prints life inside when this goes away
no problem and that's all I have for you
guys in this tutorial and this is how
naming conventions for labels have to be
done and all this naming convention for
label can be used for if statements
switch case statements and other
statements also another edition looping
and decision-making statements also but
even you guys use this use with caution
okay that's the kind that's the motive
you want to behind here and thank you
guys for watching that's all I have for
you guys in this tutor see you guys next
time bye
my channel this series is a series of
tutorials on Fortran programming now in
the last tutorial we were completely
successfully completed our successful
for the factorial program and in this
tutorial we I will be telling you guys a
little more details regarding some
factors that have to consider while
doing a do loop and we'll talk about
labels also now what does what are the
factors to be considered in do loop is
as follows first of all first of all the
do loops should be should be sandwiched
inside each other now what does that
mean
I'll tell you like this I'll tell you
for I'll tell you this in Genii and
other editors if you have a laser and we
go to interactive development
environment editors like Jeannie or
maybe more than that this is feature car
this is feature like this called as a
collapse feature okay
this collapse feature helps you to know
which face which features inside which
feature and roll now the what I mean by
sandwich is that whenever we would write
a new loop or a nested do loop 1 loop
should like completely inside the other
other loop and if this feature is not
being obeyed properly then you're then
the result will not and then the program
will throw an error and will not run
properly so that is first that is the
first thing at the consider second thing
you have to consider is that you can use
the values of the I iterating variable
but it should not be the valleys of the
hydrating they should not be modified
for instance in this loop what I know
what I feel what I can say is that I
value and I'm just using the value of I
but I'm not changing the value of I
similarly in this inside this J inside
this go to loop I'm using the value of J
but I'm not modifying the value of J
similarly here I'm reducing the value of
I but I'm not modifying the value of I
so as far this goes by you can use very
well the hydrating variables but it
cannot modify the variables inside for
instance let me just keep I equals one
now I just said I equals four in a
sudden look I just raises up compared
this
they'll throw me never look at if it's
shows and ever saying that error
variable I at one where this is one this
showing at one cannot be redefined
inside blue beginning at two so this is
the warning this is another one this in
error we won't let you come it won't
even let it compile so this is a
compilation error which you have to fix
this I wish it won't let it's a kind of
an L is a big error in Fortran so what I
have to do is that this if this being
said either value of I cannot be
modified inside its own loop outside the
loop it can not you can modify the N
number of times it doesn't matter but
inside the loop where where it is being
used as a nitrating variable i cannot be
modified okay so you have to comment
this and compare this it works fine no
problem now on the other hand okay if i
were to modify j suppose I said J equals
J equals three okay compile this it
won't throw me another why so because J
is local to this loop and outside this
loop you go outside with this loop J has
no conditions on it okay so this works
fine this this is this one throw mean
error so this I say this is an error
this has no error okay now here suppose
if I had to make this statement I equals
one I equals one you know I'm
intentionally modifying to modify this
here again if I compile this
it will throw me the same error because
I though it's inside this J loop it is
also this entire J loop is inside I saw
implicit indirectly or implicitly I is
also inside I I this I is also inside
this I loop because I this do loop with
having I so this is not accepted there
were to compare compare this with after
commenting this or this fine and if I
try to do the same thing I did over
there J equals three okay they throw me
another as passed earlier as before but
if I were to you
you know comment this out this on throw
me know
I just step no better I favored to
compare this no issues no issues
whatsoever and if I do that okay
since IJ is being reassigned here it
doesn't matter what J holds whatever it
holds about will be just removed will be
just wiped up and set over here so these
are the cautions you have to take inside
using do loops and all and next thing I
want to tell you guys is about the
labels now what a label is ask them as
the name suggests it just a name or a
kind of a label for the further
statements now labels are most
preferably used for looping statements
and other decision making statements now
if you want to write a loop right if you
want to write a label whatever you do
just give a name like outer how do how
to do loop something like that and then
to make sure that this is a loop you
give this colon symbol similarly if you
want if I want to give an inner if you
want to give her an inner state a label
for this loop I can write something like
in the loop and give a colon and
separate this out as simple as that but
this label convention comes up with
slight consequence see once you start
naming them okay okay you just print if
you just compile this it will throw a
lot of warning stating that an expected
end Dukas are carrying expanded into is
occurring and unexplained next bit
identified and the lot of stuff now what
does this mean is that you guys notice
it's underlining all the endo statements
and n program statements stating that
there is some kind of an error we didn't
notice any error in the previous because
condition so what does this mean it
means that initially when the do loops
do not have a name the compiler know
knows how to terminate them and how to
terminate them properly and all it does
use on its own but it which works out to
be fine
but then when the naming conventions are
given now you have to explicitly define
various loop is ending now
now to make sure this works properly I
have to sorry I I thought it cited in
its inter I thought I thought I thought
it was in there it's actually no it's
inter I type in ER in a do loop okay and
then I type out how to loop okay now
this indicate this indicates that the
inner loop starts here and ends here and
then City case the outer loop starts
here and ends here if you guys noticed
this just like the program name I gave a
program here and ending with the
programming here just like that just
like that now if I were to compile this
no errors okay now if I told you that
the one the loop has to be sandwiched in
between the loops right now
what if I do not sandwich if I just you
know I write this as outer outer outer
and I write this as in inner okay now
bash for this kind as per the naming
conventions the compiler will assume
that the compiler will take the outer do
loop ten here an inner inner to obtain
here so they are overlapping each other
they not going interested they are not
you know sandwich didn't say they're
actually overlapping each other so if I
were to compare this you throw an hour
it'll throw the never setting that
unexpected looping unexpected endings
endings are coming up okay and it's not
matching up with how things are going
over here and all okay now that being
said this is how now that being said
this is an indication that you know you
should not have you should not have
overlapping glows but one loop should be
inside the other or nested in chart okay
loops can be nested but it cannot be you
know the loops can be nested but it
cannot be overlapping with other loops
and that's the thing over here if I were
to rectify that issue if I this issue
and then compile this it works no error
no other I build this now I just execute
this I just type you know say it then
there you have it it works fine the
program is working fine perfect now
things we don't need the statement so I
just come with this out and then save it
no problem I use compiled build and it
sorry
I just execute this ten perfect that
prints life inside when this goes away
no problem and that's all I have for you
guys in this tutorial and this is how
naming conventions for labels have to be
done and all this naming convention for
label can be used for if statements
switch case statements and other
statements also another edition looping
and decision-making statements also but
even you guys use this use with caution
okay that's the kind that's the motive
you want to behind here and thank you
guys for watching that's all I have for
you guys in this tutor see you guys next
time bye
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Nov 25, 2024 Last updated |
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