Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 025 : Reading and Writing to files - Simple
Fortran Programming Tutorials (Revised) : 025 : Reading and Writing to files - Simple Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 025 : Reading and Writing to files - Simple Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. How can I read data from a file in Fortran? |  |
Ans. To read data from a file in Fortran, you can use the READ statement. This statement allows you to specify the file unit number, the format of the data, and the variables where the data will be stored. Here's an example:
```fortran
READ(10, *) variable1, variable2, ...
```
In this example, 10 is the file unit number, and the asterisk (*) indicates that the format of the data is free format. The variables variable1, variable2, ... are the variables where the data will be stored.
| 2. How can I write data to a file in Fortran? | |
Ans. To write data to a file in Fortran, you can use the WRITE statement. This statement allows you to specify the file unit number, the format of the data, and the values you want to write. Here's an example:
```fortran
WRITE(10, *) value1, value2, ...
```
In this example, 10 is the file unit number, and the asterisk (*) indicates that the format of the data is free format. The values value1, value2, ... are the values you want to write to the file.
| 3. How can I open a file for reading in Fortran? | |
Ans. To open a file for reading in Fortran, you can use the OPEN statement. This statement allows you to specify the file unit number, the file name, and the file access mode. Here's an example:
```fortran
OPEN(10, FILE='filename', STATUS='OLD')
```
In this example, 10 is the file unit number, 'filename' is the name of the file you want to open, and 'OLD' is the file access mode indicating that you want to open the file for reading.
| 4. How can I open a file for writing in Fortran? | |
Ans. To open a file for writing in Fortran, you can use the OPEN statement. This statement allows you to specify the file unit number, the file name, and the file access mode. Here's an example:
```fortran
OPEN(10, FILE='filename', STATUS='NEW')
```
In this example, 10 is the file unit number, 'filename' is the name of the file you want to create or overwrite, and 'NEW' is the file access mode indicating that you want to open the file for writing.
| 5. How can I close a file in Fortran? | |
Ans. To close a file in Fortran, you can use the CLOSE statement. This statement allows you to specify the file unit number of the file you want to close. Here's an example:
```fortran
CLOSE(10)
```
In this example, 10 is the file unit number of the file you want to close. Once you close the file, you won't be able to read from or write to it anymore.
Text Transcript from Video
hello guys my name is Errol and welcome
to my channel this is a series of
tutorials on Fortran programming now in
the last program we did we looked at the
some formatting specifications for
character and then we looked at arrays
how to define erase and then we looked
at looked at an example of arrays using
the Femina 5 by finding the Fibonacci
series and then we played around with
allocatable memory sorry by plated on
played on the arrays with allocate
dynamic allocation and then finally we
kind of really we kind of really annoyed
the compiler by testing the limits of
what the integer how into what the upper
limits of integer values can store for
each and every byte for each and every
bite okay and then we learned about a
little about segmentation fault when
memory uh when the compiler allocates I
mean we crosses beyond it's trying to
access a memory that it does not have
any authority or you know bound within
it okay and now in this tutorial we will
be looking will be looking a little more
we will be looking into little more
formatting and this time this is more of
a read and write formatting now all this
time all this time we were you know
working with files of all this time you
were you know reading files reading
hands values from not from the compiler
from the user but we did not read
anything from files ok and we don't we
did not write any answers in the files
in any paper in any text file or
anything so in this tutorial we will see
how to write that I am using if you guys
notice I'm using the same Fibonacci with
array there is a Fibonacci series
generating program that we used last
time and except that I made a little
more modifications here see what I'm
going to do in this tutorial I'm going
to do in this tutorial all the files
remain the same X all the things remain
the same except that I am have made a
little more modifications the first
notification is that I introduced a new
array called us see underscore was and
then I created a new
a type of integer integer array called
as inverse this is also dynamically
allocate a bill at the dynamically
allocated bill whereas the size size of
it is gets determined during the runtime
runtime okay
and it's also free in dimension it's
also an integer okay and this remains
the same and as usual I'm just reading
the file from the use reading the value
from the user printing the color
printing the content as per this and in
the allocation I'm allocating fib
underscore Val's with n values as before
and except that I'm adding these two I'm
allocating these two along with them so
I'm allocating see underscore walls and
when I'm score walls along with them
okay and then this is where the new
thing begins to start writing files are
open to start writing files or reading
files what we need is we need to make
you need to make a file and make it
somewhat are easy to access access in
the file systems know how to do that
this there is this nice little handy
function in Fortran called US Open what
it does is open this open command helps
you to create a file if create a file if
it is available if it's not available or
open a file if it's present and and
assigns a named assigns a easy-to-follow
name to it with an within the number
format okay what this file does what
this program does is that it opens a
file called us creates a file called as
a fib underscore Val dot txt if the file
is not available and allocates and me
assigns a name number to it like the
father's the number is one it's given by
the term unit and the file name is
gained by the term file okay and this is
and this value one is similar to the
file format it's just an indication
there's syndication okay and nothing
more of it nothing more of it and then I
create a new format statement with the
names with an i
and the number label 15 okay and this
format such that I initially have
initially represent an integer with
three spaces three blocks of spaces and
then three blocks of three spaces okay
and then I have five spaces separating
these two numbers and then I represent
an integer with 25 spaces then on the
screen or on the print okay
and then this is this is the usual
Fibonacci Fibonacci calculation
algorithm that we fought let me practice
that we did in the in the previous
program and what did what changes I make
is in this do loop okay
along with we I'm printing this do loop
value I'm printing the values of the
well the current value of I and then the
Fibonacci value okay from the erase and
with this using this format and also
what I'm do is that I'm writing these
values into the file how do I write this
is by this there's this write statement
which helps you to write the values into
into a file now to indicate which file
it is okay it needs I mean these two
indications one the file to be the file
in which it is to be written and the
farmer didn't which the contents have to
be written and extracted in the future
this will be good for extraction also
now the unit will to indicate the file
which I am working on right now I mean I
write the unit I write this term unit
equals for this indeed this signifies
that I will be working with this file
zip underscore Val dot txt okay and then
in the to mention the manner or
formatting which I should write the
contents okay I use this fmt way fmt
variable and assign this is 15 this
implies that I am using this format in
writing to write the values okay and to
pass to you know this is kind of like
farm at setting to write the contents
now to pass the variables what I do I
pass I and Feb underscore Val's of i
okay and now
you can just simply write this as so I
write this right write this statement
like this 1 comma 15 right 1 comma 15
but it's better to write like this
because you know and you know exactly
what term you're using and what term
you're not using say you know what in
you know what value each each
corresponds to that's it and then what
I'm doing is that is that see I opened a
file here okay I opened a file here I've
set a format here I'm writing writing
the files with the farm at the specified
above okay and I have to close the file
okay usually you don't drag I don't
necessarily required to close a file
okay well end of the program a lot of
the files get automatically closed the
compiler closes the file but if you want
to access the file contents again in the
program somewhere somewhere again in the
program or in some other sub program
that runs simultaneously or something
it's better you closed it it's very
close the file and to close it what you
do is write the command closed and then
inside it tripe specify the unit specify
the file to specify well you don't have
just like the right file right command
just specify the unit and that is
sufficient
once this command is executed the file
gets closed and what I'm doing right now
okay now I'll explain you guys why I
used C C underscore was an N was here
okay what I do is that I am reopening
this file with another unit name too so
that so that I do not confuse you guys
with one I don't confuse you guys at all
okay I reopen this same file with a unit
- with a file unit - now what I do is
that using the read statement read also
has an internal formatting he also has
an internal formatting now what I'm
doing is that I'm reading the fire the
this command in the under this for loop
reach the file tape underscore Val that
txt using this notation unit equals 2
because unit equals 2 is addressing this
file so it's reading that and then the
format I am you I mean the farm at I am
specifying the farmer to be 15 15 is
nothing but the farm at V is specified
to write the file I am just reusing the
same format here and and if the reading
follows this format it will extract two
variable two variables in each and every
line and it's in every line and the
first value will be an integer and that
I that gets stored storing involves and
involves of I and next will be the
Fibonacci that the equivalent Fibonacci
term that will still get stored in C
underscore valves are 5 now what I do
just to make sure that both of them are
right me I excited them properly I am
just going to check them out how would I
take them out in this line what I'm
gonna do is that I'm going to print in
an unformatted kind a non formal manner
I'm going to print the value of I so
this line will give the value of I so it
will print I equals the value of I and
followed by I minus n it what we'll do
is just it subtracts I and n vials of I
and the print service answer and then it
is going to going to print the fifth -
fifth check which will be equal to the
Fibonacci value that we calculated in
here for each and every value of I and
the value that we just extracted in the
above in the above in the eyeball line
maybe we'll be using this and we'll be
defining the difference of it now if our
extraction goes perfectly right
perfectly right this this should this
should yield the value this should
change from one to one 200 and this
value should remain zero from all the
way for all values of I and this should
also remain zero all the way okay now to
check this what I'm do and then what I'm
doing is after doing this do after this
do loop does and I have to deallocate
the values since I'm allocating the
memory here it's it's a bad good
practice delicated sometimes if you
don't deal like it maybe this these
ma'am these values might still be
occupying memory and might might make
other programs that are running
simultaneously to you know fix memory
other memory at other places this memory
is Delocated
then this memory can be
we used by some other programs that are
running simultaneously and all and
finally since we opened this file again
not to close this file using this term
okay now
hope you guys are able to follow
whatever written okay and you guys are
okay with my under explanation of it now
now let's see I come here this is how
the result looks like I just check Ross
checked it and if you guys want to know
have a look at it
look at it this is how it looks like I
don't know let me just clear this okay
okay let me just clear this I know I
just confused with stuff
okay now I'll compile this program no
issues and then execute the cleaner you
get this film dot exe statement
it's acts asked me for the number of
terms I gave it hundred and that's it he
prints all the values of I I minus N and
fitzek and all of them are 0 perfect and
you guys notice the Fibonacci it prints
a Fibonacci values also and then you get
these values also now we just click and
LS I still have this fib underscore
while they ban fib underscore well what
I can do is that is that I can just type
genie genie and then type fib underscore
well to open it and when I open this
open this I get the same files they get
the same file without being any without
having any modification now open file
you when the fire when there's this one
one more comment here then this open
file open command is used
ok if the file is absent it will create
the file and if the file is already
present it will read the file in read
only mode alone and you need read only
more alone if a read command is used
ok me so this read command is used then
the file will be read in reader as a
read only but if the write command is
used the file will be appended or
overwritten so even you guys are working
with multiple files cut transfer and
copy saving files on one file to another
or doing some kind of a manipulation of
that sort be be a little careful be
little careful by choosing the units and
formatting specifications or not ok and
that's it that's it for that's that's
all I have about this tutorial thank you
guys for watching in the next tutorial I
promise you I want to say for my word ok
I promise you we look into little more
of Irish and then we
and then if time permits we'll give you
guys introduction to functions and
subroutines or not thank you guys for
watching so see you guys next time
to my channel this is a series of
tutorials on Fortran programming now in
the last program we did we looked at the
some formatting specifications for
character and then we looked at arrays
how to define erase and then we looked
at looked at an example of arrays using
the Femina 5 by finding the Fibonacci
series and then we played around with
allocatable memory sorry by plated on
played on the arrays with allocate
dynamic allocation and then finally we
kind of really we kind of really annoyed
the compiler by testing the limits of
what the integer how into what the upper
limits of integer values can store for
each and every byte for each and every
bite okay and then we learned about a
little about segmentation fault when
memory uh when the compiler allocates I
mean we crosses beyond it's trying to
access a memory that it does not have
any authority or you know bound within
it okay and now in this tutorial we will
be looking will be looking a little more
we will be looking into little more
formatting and this time this is more of
a read and write formatting now all this
time all this time we were you know
working with files of all this time you
were you know reading files reading
hands values from not from the compiler
from the user but we did not read
anything from files ok and we don't we
did not write any answers in the files
in any paper in any text file or
anything so in this tutorial we will see
how to write that I am using if you guys
notice I'm using the same Fibonacci with
array there is a Fibonacci series
generating program that we used last
time and except that I made a little
more modifications here see what I'm
going to do in this tutorial I'm going
to do in this tutorial all the files
remain the same X all the things remain
the same except that I am have made a
little more modifications the first
notification is that I introduced a new
array called us see underscore was and
then I created a new
a type of integer integer array called
as inverse this is also dynamically
allocate a bill at the dynamically
allocated bill whereas the size size of
it is gets determined during the runtime
runtime okay
and it's also free in dimension it's
also an integer okay and this remains
the same and as usual I'm just reading
the file from the use reading the value
from the user printing the color
printing the content as per this and in
the allocation I'm allocating fib
underscore Val's with n values as before
and except that I'm adding these two I'm
allocating these two along with them so
I'm allocating see underscore walls and
when I'm score walls along with them
okay and then this is where the new
thing begins to start writing files are
open to start writing files or reading
files what we need is we need to make
you need to make a file and make it
somewhat are easy to access access in
the file systems know how to do that
this there is this nice little handy
function in Fortran called US Open what
it does is open this open command helps
you to create a file if create a file if
it is available if it's not available or
open a file if it's present and and
assigns a named assigns a easy-to-follow
name to it with an within the number
format okay what this file does what
this program does is that it opens a
file called us creates a file called as
a fib underscore Val dot txt if the file
is not available and allocates and me
assigns a name number to it like the
father's the number is one it's given by
the term unit and the file name is
gained by the term file okay and this is
and this value one is similar to the
file format it's just an indication
there's syndication okay and nothing
more of it nothing more of it and then I
create a new format statement with the
names with an i
and the number label 15 okay and this
format such that I initially have
initially represent an integer with
three spaces three blocks of spaces and
then three blocks of three spaces okay
and then I have five spaces separating
these two numbers and then I represent
an integer with 25 spaces then on the
screen or on the print okay
and then this is this is the usual
Fibonacci Fibonacci calculation
algorithm that we fought let me practice
that we did in the in the previous
program and what did what changes I make
is in this do loop okay
along with we I'm printing this do loop
value I'm printing the values of the
well the current value of I and then the
Fibonacci value okay from the erase and
with this using this format and also
what I'm do is that I'm writing these
values into the file how do I write this
is by this there's this write statement
which helps you to write the values into
into a file now to indicate which file
it is okay it needs I mean these two
indications one the file to be the file
in which it is to be written and the
farmer didn't which the contents have to
be written and extracted in the future
this will be good for extraction also
now the unit will to indicate the file
which I am working on right now I mean I
write the unit I write this term unit
equals for this indeed this signifies
that I will be working with this file
zip underscore Val dot txt okay and then
in the to mention the manner or
formatting which I should write the
contents okay I use this fmt way fmt
variable and assign this is 15 this
implies that I am using this format in
writing to write the values okay and to
pass to you know this is kind of like
farm at setting to write the contents
now to pass the variables what I do I
pass I and Feb underscore Val's of i
okay and now
you can just simply write this as so I
write this right write this statement
like this 1 comma 15 right 1 comma 15
but it's better to write like this
because you know and you know exactly
what term you're using and what term
you're not using say you know what in
you know what value each each
corresponds to that's it and then what
I'm doing is that is that see I opened a
file here okay I opened a file here I've
set a format here I'm writing writing
the files with the farm at the specified
above okay and I have to close the file
okay usually you don't drag I don't
necessarily required to close a file
okay well end of the program a lot of
the files get automatically closed the
compiler closes the file but if you want
to access the file contents again in the
program somewhere somewhere again in the
program or in some other sub program
that runs simultaneously or something
it's better you closed it it's very
close the file and to close it what you
do is write the command closed and then
inside it tripe specify the unit specify
the file to specify well you don't have
just like the right file right command
just specify the unit and that is
sufficient
once this command is executed the file
gets closed and what I'm doing right now
okay now I'll explain you guys why I
used C C underscore was an N was here
okay what I do is that I am reopening
this file with another unit name too so
that so that I do not confuse you guys
with one I don't confuse you guys at all
okay I reopen this same file with a unit
- with a file unit - now what I do is
that using the read statement read also
has an internal formatting he also has
an internal formatting now what I'm
doing is that I'm reading the fire the
this command in the under this for loop
reach the file tape underscore Val that
txt using this notation unit equals 2
because unit equals 2 is addressing this
file so it's reading that and then the
format I am you I mean the farm at I am
specifying the farmer to be 15 15 is
nothing but the farm at V is specified
to write the file I am just reusing the
same format here and and if the reading
follows this format it will extract two
variable two variables in each and every
line and it's in every line and the
first value will be an integer and that
I that gets stored storing involves and
involves of I and next will be the
Fibonacci that the equivalent Fibonacci
term that will still get stored in C
underscore valves are 5 now what I do
just to make sure that both of them are
right me I excited them properly I am
just going to check them out how would I
take them out in this line what I'm
gonna do is that I'm going to print in
an unformatted kind a non formal manner
I'm going to print the value of I so
this line will give the value of I so it
will print I equals the value of I and
followed by I minus n it what we'll do
is just it subtracts I and n vials of I
and the print service answer and then it
is going to going to print the fifth -
fifth check which will be equal to the
Fibonacci value that we calculated in
here for each and every value of I and
the value that we just extracted in the
above in the above in the eyeball line
maybe we'll be using this and we'll be
defining the difference of it now if our
extraction goes perfectly right
perfectly right this this should this
should yield the value this should
change from one to one 200 and this
value should remain zero from all the
way for all values of I and this should
also remain zero all the way okay now to
check this what I'm do and then what I'm
doing is after doing this do after this
do loop does and I have to deallocate
the values since I'm allocating the
memory here it's it's a bad good
practice delicated sometimes if you
don't deal like it maybe this these
ma'am these values might still be
occupying memory and might might make
other programs that are running
simultaneously to you know fix memory
other memory at other places this memory
is Delocated
then this memory can be
we used by some other programs that are
running simultaneously and all and
finally since we opened this file again
not to close this file using this term
okay now
hope you guys are able to follow
whatever written okay and you guys are
okay with my under explanation of it now
now let's see I come here this is how
the result looks like I just check Ross
checked it and if you guys want to know
have a look at it
look at it this is how it looks like I
don't know let me just clear this okay
okay let me just clear this I know I
just confused with stuff
okay now I'll compile this program no
issues and then execute the cleaner you
get this film dot exe statement
it's acts asked me for the number of
terms I gave it hundred and that's it he
prints all the values of I I minus N and
fitzek and all of them are 0 perfect and
you guys notice the Fibonacci it prints
a Fibonacci values also and then you get
these values also now we just click and
LS I still have this fib underscore
while they ban fib underscore well what
I can do is that is that I can just type
genie genie and then type fib underscore
well to open it and when I open this
open this I get the same files they get
the same file without being any without
having any modification now open file
you when the fire when there's this one
one more comment here then this open
file open command is used
ok if the file is absent it will create
the file and if the file is already
present it will read the file in read
only mode alone and you need read only
more alone if a read command is used
ok me so this read command is used then
the file will be read in reader as a
read only but if the write command is
used the file will be appended or
overwritten so even you guys are working
with multiple files cut transfer and
copy saving files on one file to another
or doing some kind of a manipulation of
that sort be be a little careful be
little careful by choosing the units and
formatting specifications or not ok and
that's it that's it for that's that's
all I have about this tutorial thank you
guys for watching in the next tutorial I
promise you I want to say for my word ok
I promise you we look into little more
of Irish and then we
and then if time permits we'll give you
guys introduction to functions and
subroutines or not thank you guys for
watching so see you guys next time
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