Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 018 : Successive Factorial + Do loop
Fortran Programming Tutorials (Revised) : 018 : Successive Factorial + Do loop Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 018 : Successive Factorial + Do loop Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. What is the purpose of the Successive Factorial program in Fortran? |  |
Ans. The purpose of the Successive Factorial program in Fortran is to calculate the factorial of a given number using a do loop.
| 2. How does the Successive Factorial program work in Fortran? | |
Ans. The Successive Factorial program in Fortran uses a do loop to calculate the factorial of a given number. It starts with an initial value of 1 and multiplies it successively with each number from 1 to the given number.
| 3. Can you provide an example of the Successive Factorial program in Fortran? | |
Ans. Sure! Here is an example of the Successive Factorial program in Fortran:
```
program successive_factorial
implicit none
integer :: num, factorial, i
write(*,*) 'Enter a number:'
read(*,*) num
factorial = 1
do i = 1, num
factorial = factorial * i
end do
write(*,*) 'The factorial of', num, 'is', factorial
end program successive_factorial
```
| 4. What is the significance of using a do loop in the Successive Factorial program? | |
Ans. The do loop in the Successive Factorial program allows us to calculate the factorial of a given number by performing repetitive multiplication operations. It simplifies the code by eliminating the need for multiple individual multiplication statements.
| 5. Are there any limitations to consider when using the Successive Factorial program in Fortran? | |
Ans. Yes, there are limitations to consider when using the Successive Factorial program in Fortran. One limitation is that the program may not be able to calculate the factorial of large numbers accurately due to the limited range of integer data types. Additionally, the program may become slower for larger input values as it needs to perform more multiplication operations.
Text Transcript from Video
hello 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 saw about the
modulus operation in this tutorial we
just revisit the do statement that we
did that we did and a few tutorials back
ok because either of going to select
case tutorials so I thought it will be
better if you guys go and a little more
complicated example with do with the do
loop before going to switch case and all
ok now what I have here is I have a
program named have a file name do
underscores factorial dot F 95 and I
have a program called us do underscore
fact with just an implicit statement
inside and I have a comment to explain
this is a succeed or successive
factorial with the dough using do loop
they'll do that successive factorial and
we will be doing this in we'll be doing
this in Genie and just one more
information guys you guys notice on the
top I noticed something called as this I
note this a little me a new statement
which I which is this is not present in
other for programs what this I'll
explain what you guys this means it in
as far as water and ask answer consider
whenever you write an exclamation symbol
or a dollar and a dollar summit together
then it means this then then this means
it's a it's a preprocessor directive
that took preprocessor directive or a
compiler previously r2
now what does this mean is that these
are statements that actually directly
sell the can tell the compiler to do
certain jobs accordingly okay
now sometimes people call exclamation
dollar some pipe sometimes people call
it exclamation dollar symbol or
sometimes they call it bang dollar sign
whichever you call it it's every call it
but this what this represents this
represents a preprocessor director and
this statement slash user slash bin
slash default run this is actually an
indication to this action indication to
you know to the compiler that we wanted
to do a Fortran you want to involve the
Fortran program and all okay you want
this program in Fortran used this
particular version in my laptop I just
have only AG Photokina Fortran but in
some other systems I mean in your system
you men have the same but in some other
systems and for some uses they might
they might have you know use multiple
versions of Fortran so it does sometimes
it will be necessary to indicate where
as to which compared with Fortran to be
used and all and for that purpose
instead of you know manually going and
you know selecting all the stuff this is
very useful and this also helps you to
make the code as an executable instead
of Jeannot compiling and building from
the start this helps you to know run the
code and get the executable immediately
we'll guys we'll have a look at this
we'll have a look at how to execute this
file after some time through our instead
of compiling and building and you know
getting the executable and stuff
afterwards okay now I have now let's
start doing a program now for those of
you most of you guys must have known
what a fact or a list okay it is
actually the product of the consecutive
integers all the way from one till the
numbers for suppose if you have a number
called us say n then then n factor will
given by n and exclamation is actually n
into n minus 1 in brackets in brackets n
minus 1 okay into in brackets n minus 2
into n minus 3 and multiplied and so on
till the three to one and that's it this
is this counts are consecutive product
of numbers all the way from one to that
particular number is called as a numbers
factorial so for another example suppose
you want number called a six and if you
have a six if you want to find six
factorial 6 factorial then it is nothing
but 6 into sorry this is nothing was 6
into 5 into 4 I mean or 6 times 5 times
4 times 3 times 2 times 1 which if my
multiplication goes right 30:13 2 for
the 120
for 120 into for three years 360 360 to
720 720 that's it
now let's what in this program what I'm
going to do is that I'm going to print
the success of factorials since I'm
going to use a do loop and in the in
doing the do loop I'm going to print the
factorial of first year natural first in
numbers successive one after the other
and that's why the program is successive
factorial and this program will think
it'll go in two videos so just go along
with it go along with me this will be in
two parts this will be the first part
what we do is that you guys get the
explanation right let's start our
program let's start our program
seriously now I just I need an integer
okay this is the advantage of having a
scribble pad okay I can just you know I
wrote this code initially so that I can
just cross verify this and all okay I
check this code I'm just doing this in
front of you guys for that you guys
don't know okay I need an integer yeah
you need an integer I for this this I
acts as the looping statement I mean
look the I treat a variable for the do
loop that you're going to use and we
need an N from which we'll get from that
the user jason another looping statement
looping variable that will be used for
the other do loop and then we need a
variable called as fact and then I'm
going to print we're gonna print on the
screen okay and the int value for for n
okay and then I'm going to get the read
the value from the user with a read
statement and that's it now let's do
let's go for deuced
let's go for the do loop as mentioned
earlier in do loop whatever you'd write
between 2 and n 2 will be repeated will
be repeated for each and repeated for
each and every value of the iteration
variable given in the rate for in this
case this entire whatever whatever
contents return it in this do and this n
do will be repeated for
this case n times and for each of the
repetition I value changes i value
changes so the faster iteration you have
the first iteration will be done with I
equals 1 the second iteration will be
done with I equals 2 so on up to I I
becomes en and after that the do loop
ends ok now that being said that being
said let's okay
let's see first we get will get the I
value I value working ok so I just print
a print this statement inside the loop
loop I equals comma I to get this to
make sure this works fine okay
this is going to be a step-by-step
process so make sure this is working
fine I'll just print to see that this
works well I is getting printed properly
or not if I just compile this it just
shows me that I have to have two
warnings that it sure it tells me that I
haven't you specified j and i specified
fat but i haven't used them but it's
just a warning so nothing to worry it
build is again execute this issue you
get this file i'll just ask me enter the
value of n eyes let me give fight so it
prints inside the loop i equals 1 2 3 4
5 and that's it so this is working out
to be fine this loop is working out to
be fine now in the next loop i just keep
the scribble pattern okay what do you do
is that this is working fine and I don't
want this anymore so I just try to do
they just you know comment this out and
by the way I forgot to tell you from
most of you guys this tabulation is this
tab indentation I'm using in Fortran
this is not at all necessary but if you
guys use this the program becomes easily
readable much readable and you guys
notice the blank space that has leaved
blank lines lived here just only for to
increase the readability and if you guys
want everything to be jam-packed without
any line of blank lines it's perfectly
fine but I recommend you use the tab and
intend Asians like this and black
clients to make the code more readable
okay okay now coming back to the program
now let me set fact equals one let me
set fact equal thirty equals one and let
me start at the two loop okay
now I'll pass the video I'll stop the
video here and I'll continue the
remaining part in the second video in
the second video because the second this
part because this video is already going
a little too long okay
will candy in the second do a second
video thank you guys for watching see
you guys in the next video bye
to my channel this series is a series of
tutorials on Fortran programming now in
the last tutorial we saw about the
modulus operation in this tutorial we
just revisit the do statement that we
did that we did and a few tutorials back
ok because either of going to select
case tutorials so I thought it will be
better if you guys go and a little more
complicated example with do with the do
loop before going to switch case and all
ok now what I have here is I have a
program named have a file name do
underscores factorial dot F 95 and I
have a program called us do underscore
fact with just an implicit statement
inside and I have a comment to explain
this is a succeed or successive
factorial with the dough using do loop
they'll do that successive factorial and
we will be doing this in we'll be doing
this in Genie and just one more
information guys you guys notice on the
top I noticed something called as this I
note this a little me a new statement
which I which is this is not present in
other for programs what this I'll
explain what you guys this means it in
as far as water and ask answer consider
whenever you write an exclamation symbol
or a dollar and a dollar summit together
then it means this then then this means
it's a it's a preprocessor directive
that took preprocessor directive or a
compiler previously r2
now what does this mean is that these
are statements that actually directly
sell the can tell the compiler to do
certain jobs accordingly okay
now sometimes people call exclamation
dollar some pipe sometimes people call
it exclamation dollar symbol or
sometimes they call it bang dollar sign
whichever you call it it's every call it
but this what this represents this
represents a preprocessor director and
this statement slash user slash bin
slash default run this is actually an
indication to this action indication to
you know to the compiler that we wanted
to do a Fortran you want to involve the
Fortran program and all okay you want
this program in Fortran used this
particular version in my laptop I just
have only AG Photokina Fortran but in
some other systems I mean in your system
you men have the same but in some other
systems and for some uses they might
they might have you know use multiple
versions of Fortran so it does sometimes
it will be necessary to indicate where
as to which compared with Fortran to be
used and all and for that purpose
instead of you know manually going and
you know selecting all the stuff this is
very useful and this also helps you to
make the code as an executable instead
of Jeannot compiling and building from
the start this helps you to know run the
code and get the executable immediately
we'll guys we'll have a look at this
we'll have a look at how to execute this
file after some time through our instead
of compiling and building and you know
getting the executable and stuff
afterwards okay now I have now let's
start doing a program now for those of
you most of you guys must have known
what a fact or a list okay it is
actually the product of the consecutive
integers all the way from one till the
numbers for suppose if you have a number
called us say n then then n factor will
given by n and exclamation is actually n
into n minus 1 in brackets in brackets n
minus 1 okay into in brackets n minus 2
into n minus 3 and multiplied and so on
till the three to one and that's it this
is this counts are consecutive product
of numbers all the way from one to that
particular number is called as a numbers
factorial so for another example suppose
you want number called a six and if you
have a six if you want to find six
factorial 6 factorial then it is nothing
but 6 into sorry this is nothing was 6
into 5 into 4 I mean or 6 times 5 times
4 times 3 times 2 times 1 which if my
multiplication goes right 30:13 2 for
the 120
for 120 into for three years 360 360 to
720 720 that's it
now let's what in this program what I'm
going to do is that I'm going to print
the success of factorials since I'm
going to use a do loop and in the in
doing the do loop I'm going to print the
factorial of first year natural first in
numbers successive one after the other
and that's why the program is successive
factorial and this program will think
it'll go in two videos so just go along
with it go along with me this will be in
two parts this will be the first part
what we do is that you guys get the
explanation right let's start our
program let's start our program
seriously now I just I need an integer
okay this is the advantage of having a
scribble pad okay I can just you know I
wrote this code initially so that I can
just cross verify this and all okay I
check this code I'm just doing this in
front of you guys for that you guys
don't know okay I need an integer yeah
you need an integer I for this this I
acts as the looping statement I mean
look the I treat a variable for the do
loop that you're going to use and we
need an N from which we'll get from that
the user jason another looping statement
looping variable that will be used for
the other do loop and then we need a
variable called as fact and then I'm
going to print we're gonna print on the
screen okay and the int value for for n
okay and then I'm going to get the read
the value from the user with a read
statement and that's it now let's do
let's go for deuced
let's go for the do loop as mentioned
earlier in do loop whatever you'd write
between 2 and n 2 will be repeated will
be repeated for each and repeated for
each and every value of the iteration
variable given in the rate for in this
case this entire whatever whatever
contents return it in this do and this n
do will be repeated for
this case n times and for each of the
repetition I value changes i value
changes so the faster iteration you have
the first iteration will be done with I
equals 1 the second iteration will be
done with I equals 2 so on up to I I
becomes en and after that the do loop
ends ok now that being said that being
said let's okay
let's see first we get will get the I
value I value working ok so I just print
a print this statement inside the loop
loop I equals comma I to get this to
make sure this works fine okay
this is going to be a step-by-step
process so make sure this is working
fine I'll just print to see that this
works well I is getting printed properly
or not if I just compile this it just
shows me that I have to have two
warnings that it sure it tells me that I
haven't you specified j and i specified
fat but i haven't used them but it's
just a warning so nothing to worry it
build is again execute this issue you
get this file i'll just ask me enter the
value of n eyes let me give fight so it
prints inside the loop i equals 1 2 3 4
5 and that's it so this is working out
to be fine this loop is working out to
be fine now in the next loop i just keep
the scribble pattern okay what do you do
is that this is working fine and I don't
want this anymore so I just try to do
they just you know comment this out and
by the way I forgot to tell you from
most of you guys this tabulation is this
tab indentation I'm using in Fortran
this is not at all necessary but if you
guys use this the program becomes easily
readable much readable and you guys
notice the blank space that has leaved
blank lines lived here just only for to
increase the readability and if you guys
want everything to be jam-packed without
any line of blank lines it's perfectly
fine but I recommend you use the tab and
intend Asians like this and black
clients to make the code more readable
okay okay now coming back to the program
now let me set fact equals one let me
set fact equal thirty equals one and let
me start at the two loop okay
now I'll pass the video I'll stop the
video here and I'll continue the
remaining part in the second video in
the second video because the second this
part because this video is already going
a little too long okay
will candy in the second do a second
video thank you guys for watching see
you guys in the next video bye
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About this Video
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Nov 24, 2024 Last updated |
Video Description: Fortran Programming Tutorials (Revised) : 018 : Successive Factorial + Do loop for Database Management 2024 is part of Introduction to Fortran Programming (Basic Level) preparation.
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