Database Management Exam > Database Management Videos > Introduction to Fortran Programming (Basic Level) > Fortran Programming Tutorials (Revised) : 011 : If statement and Relational Operators
Fortran Programming Tutorials (Revised) : 011 : If statement and Relational Operators Video Lecture | Introduction to Fortran Programming (Basic Level) - Database Management
FAQs on Fortran Programming Tutorials (Revised) : 011 : If statement and Relational Operators Video Lecture - Introduction to Fortran Programming (Basic Level) - Database Management
| 1. What are relational operators in Fortran programming? |  |
Ans. Relational operators in Fortran programming are used to compare the relationship between two values. These operators include < (less than), > (greater than), <= (less than or equal to), >= (greater than or equal to), == (equal to), and /= (not equal to). They return a logical value of either true or false based on the comparison result.
| 2. How do I use the if statement in Fortran programming? | |
Ans. The if statement in Fortran programming is used for conditional execution of code. It allows you to specify a condition and execute a block of code only if the condition is true. The basic syntax is:
```
if (condition) then
! code to be executed if condition is true
else
! code to be executed if condition is false
end if
```
You can also have nested if statements for more complex conditions.
| 3. Can I use multiple conditions in an if statement in Fortran? | |
Ans. Yes, you can use multiple conditions in an if statement in Fortran by combining them with logical operators such as .and. (logical AND), .or. (logical OR), and .not. (logical NOT). For example:
```
if (condition1 .and. condition2) then
! code to be executed if both condition1 and condition2 are true
else if (condition3 .or. condition4) then
! code to be executed if either condition3 or condition4 is true
else
! code to be executed if none of the conditions are true
end if
```
You can also use parentheses to group conditions and control the evaluation order.
| 4. How can I compare strings in an if statement in Fortran? | |
Ans. To compare strings in an if statement in Fortran, you can use the intrinsic function `strcmp` or `strncmp`. These functions compare two strings character by character and return an integer value indicating the result of the comparison. For example:
```
if (strcmp(string1, string2) == 0) then
! code to be executed if string1 is equal to string2
else if (strcmp(string1, string2) < 0) then
! code to be executed if string1 is less than string2
else
! code to be executed if string1 is greater than string2
end if
```
Note that you need to include the `iso_c_binding` module and declare the strings as `character(len=*)` to use these functions.
| 5. Can I use if statements in database management using Fortran? | |
Ans. Yes, you can use if statements in database management using Fortran. If your Fortran program interacts with a database, you can use if statements to perform conditional queries or updates based on certain criteria. For example, you can use an if statement to check if a certain record meets specified conditions before updating its values or retrieving data from the database. The specific syntax and usage may vary depending on the database management system and APIs you are using in your Fortran program.
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 ba
ba we will be assuming from the portion
that we left in the last tutorial we
were look we were trying to find the
length of the length of a line
connecting a point and the origin the
angle it makes with language makes with
the x axis x axis and there now will be
fi will be finding the the quadrant in
which the point X comma Y lies u X comma
Y lies using if statement and if
statements and relational operators ok
now Watson if state now what's in a
statement an if statement is salvation'
making statement that says that the
decides what has to be done when certain
conditions are met and what has to be
done simple as that what has to be done
when certain conditions are met
something like if this happen this is
the logic is like this if certain thing
happens do this else if they some that
some other thing happens do this else if
some other thing happens do this
ultimately none of these things happen
you know the expected things happen do
this this is the basic logic office
ok now to write an if statement it goes
like this what you need is you have to
write the keyword if and then it'll and
then you have to write the condition ok
then you have to write the keyword then
and then you have to write your set of
condition that you have to follow okay
and if and if this condition that you
mentioned here does not work you have to
write else and then write else if and
then you have to set a new condition
then if this is this condition is
followed then you have to set the set of
rules set up and the set of sessions to
follow and this goes on if this if this
if does not work you have to go with
another itself if there's another
possibility this goes on and finally if
none of the conditions set about or kind
of set up our stuff work for you finally
set up a few more conditions if a few my
instructions are to tell the program
that
none of this worked so I'm quitting it
up doing this and then to ensure that
the if then this decision branching is
over you have to type this end of
command okay this is how the basic logic
goes play as per this logic that's for
this logic
you don't need an else statement you
don't need another statement by default
in the program and you can have as many
else if statements as you want even if
they if construct
sometimes if statement if if then a
statement is also called as if construct
because it's kind of a orderly manner of
procedure in which the certain things
have to be done okay now for this point
for our logic I'm not using going to use
the angle to find the quadrant rather
I'm using the sign conventions for the
sign convinced the science of X&Y for
the point so I'm saying if X is positive
Y is positive you guys know I mean you
guys must be aware of the X&Y coordinate
quadrant split of the sign converts in
the quadrants if both the coordinates x
and y are positive then here in first
quadrant in your in quadrant one okay if
the axis negative going anti-clockwise X
is negative and Y is positive you are in
quadrant two okay if X is negative y is
negative then you are in quadrant three
and then if X is positive and Y or Y is
still negative then Y is negative then
you are in quadrant four okay thing is
if X is positive and Y is negative then
then Q is 1 so I'm saying I'm trying to
make the trying to make this if
statement little more logically if X
quad X is positive and Y is positive
then the point is in q1
in q1 agreed else or else--if this
doesn't work
yes if X is positive and Y is negative
then point yes and q q2 if this doesn't
work yes if X is negative and Y is
negative then point this in Quadrant
three finally because finally there's an
our last alternative because after this
alternative the other values cannot be
possible
so what you say is that what what you
can say is that else yes
point is then we don't want this because
the PI but it's understood by default
that if none of the above conditions
work then the point has to be in fourth
quadrant so we say that the point is in
Quadrant four to indicate that we let's
use a character variable character cube
okay
now let's set that now this is the logic
we saw we write we have to write here if
you guys know this this is a proper if
condition that we use in normal you know
English English manner and this is
exactly getting translated here how
watch if if X is is positive so if X
greater than or equal to zero okay this
means that X is positive and do you need
an and statement for that the logical
the logical and is actually given by
this a and B with dot okay and why y
greater than or equal to zero
then what I do is at Q equals quadrant
one so I write this as like this that's
all as the statement I need there is
what I can do it this is the this
doesn't work good okay
other possibility is that Q is less than
0 and Y is greater than sorry if X is
less than 0 this is not equal to 0 and Q
said it Y is greater than or equal to 0
then it means the power point is in
Quadrant two ok now if I just to copy
this again I can reuse the same code
there's a little modification to you
know save some typing say something
typing ok now by the same logic if Q if
the if the if the x value is less than 0
and the y value is less than 0 then the
point 3 point is in Quadrant 3 and
finally none of them if none of them
agreed agrees that means by default the
point is in corner for so I write this
as point I write this as 4 ok now now
let me mention you guys a few or
illogical of me okay
there are a few more logical operators
and stuff ok these are not the only
logical operator expressions we can use
another logical operators also there
anyway I'll explain that and I'll
explain that in the next tutorial next
tutorial we will be looking at a few
more things and that I'll explain you
guys little about logical operators and
relational operators little carefully
now as I've now just follow with me this
means greater than or equal to this
means greater than this means less than
or equal to there are other also so the
point
point is in quadrant comma Q okay this
being said this is this is how we set
the value for this how we said if if
else if else statement okay now a
program is ready let's compile this
build this with f8 and f9 and then run
this let the let me give al you 3 + 4 X
+ 4 for y ya yell the length is Phi the
angle is 53 degrees the point is in
Quadrant 1 because because x is greater
than 0 it's 3 and y is greater than 0 so
Q is set to 1 and we get it here let's
check this condition with another point
now let me just set this X to be minus 3
and write it before it's in Quadrant 2
perfect our logic is quite working out
to be fine
now run this again we guys once you guys
compile and build it as long as you
don't you didn't make any corrections to
the file you don't have to comparable to
all the time you just have to execute
with a fight that's enough okay now you
know let me give you a point minus 3 and
minus 4 this ship in Quadrant 3 yes it
does
and finally the last option the point is
in the XS for X is positive Y is
negative yeah the coil point is in
Quadrant 4 perfect
there you have it guys you're
successfully completed our program to
you know find the point find the length
or distance connecting the point and the
origin the angle that this line makes
and the quadrant admits the pointless
thank you guys for watching see you guys
the next tutorial and in the next
tutorial we'll go into a little more
detail go a little more deeper into the
relational logical operators the type of
operators available and then you call
into other other programs and dogs so
thanks for watching so see you guys
around
to my channel this series is a series of
tutorials on Fortran programming now ba
ba we will be assuming from the portion
that we left in the last tutorial we
were look we were trying to find the
length of the length of a line
connecting a point and the origin the
angle it makes with language makes with
the x axis x axis and there now will be
fi will be finding the the quadrant in
which the point X comma Y lies u X comma
Y lies using if statement and if
statements and relational operators ok
now Watson if state now what's in a
statement an if statement is salvation'
making statement that says that the
decides what has to be done when certain
conditions are met and what has to be
done simple as that what has to be done
when certain conditions are met
something like if this happen this is
the logic is like this if certain thing
happens do this else if they some that
some other thing happens do this else if
some other thing happens do this
ultimately none of these things happen
you know the expected things happen do
this this is the basic logic office
ok now to write an if statement it goes
like this what you need is you have to
write the keyword if and then it'll and
then you have to write the condition ok
then you have to write the keyword then
and then you have to write your set of
condition that you have to follow okay
and if and if this condition that you
mentioned here does not work you have to
write else and then write else if and
then you have to set a new condition
then if this is this condition is
followed then you have to set the set of
rules set up and the set of sessions to
follow and this goes on if this if this
if does not work you have to go with
another itself if there's another
possibility this goes on and finally if
none of the conditions set about or kind
of set up our stuff work for you finally
set up a few more conditions if a few my
instructions are to tell the program
that
none of this worked so I'm quitting it
up doing this and then to ensure that
the if then this decision branching is
over you have to type this end of
command okay this is how the basic logic
goes play as per this logic that's for
this logic
you don't need an else statement you
don't need another statement by default
in the program and you can have as many
else if statements as you want even if
they if construct
sometimes if statement if if then a
statement is also called as if construct
because it's kind of a orderly manner of
procedure in which the certain things
have to be done okay now for this point
for our logic I'm not using going to use
the angle to find the quadrant rather
I'm using the sign conventions for the
sign convinced the science of X&Y for
the point so I'm saying if X is positive
Y is positive you guys know I mean you
guys must be aware of the X&Y coordinate
quadrant split of the sign converts in
the quadrants if both the coordinates x
and y are positive then here in first
quadrant in your in quadrant one okay if
the axis negative going anti-clockwise X
is negative and Y is positive you are in
quadrant two okay if X is negative y is
negative then you are in quadrant three
and then if X is positive and Y or Y is
still negative then Y is negative then
you are in quadrant four okay thing is
if X is positive and Y is negative then
then Q is 1 so I'm saying I'm trying to
make the trying to make this if
statement little more logically if X
quad X is positive and Y is positive
then the point is in q1
in q1 agreed else or else--if this
doesn't work
yes if X is positive and Y is negative
then point yes and q q2 if this doesn't
work yes if X is negative and Y is
negative then point this in Quadrant
three finally because finally there's an
our last alternative because after this
alternative the other values cannot be
possible
so what you say is that what what you
can say is that else yes
point is then we don't want this because
the PI but it's understood by default
that if none of the above conditions
work then the point has to be in fourth
quadrant so we say that the point is in
Quadrant four to indicate that we let's
use a character variable character cube
okay
now let's set that now this is the logic
we saw we write we have to write here if
you guys know this this is a proper if
condition that we use in normal you know
English English manner and this is
exactly getting translated here how
watch if if X is is positive so if X
greater than or equal to zero okay this
means that X is positive and do you need
an and statement for that the logical
the logical and is actually given by
this a and B with dot okay and why y
greater than or equal to zero
then what I do is at Q equals quadrant
one so I write this as like this that's
all as the statement I need there is
what I can do it this is the this
doesn't work good okay
other possibility is that Q is less than
0 and Y is greater than sorry if X is
less than 0 this is not equal to 0 and Q
said it Y is greater than or equal to 0
then it means the power point is in
Quadrant two ok now if I just to copy
this again I can reuse the same code
there's a little modification to you
know save some typing say something
typing ok now by the same logic if Q if
the if the if the x value is less than 0
and the y value is less than 0 then the
point 3 point is in Quadrant 3 and
finally none of them if none of them
agreed agrees that means by default the
point is in corner for so I write this
as point I write this as 4 ok now now
let me mention you guys a few or
illogical of me okay
there are a few more logical operators
and stuff ok these are not the only
logical operator expressions we can use
another logical operators also there
anyway I'll explain that and I'll
explain that in the next tutorial next
tutorial we will be looking at a few
more things and that I'll explain you
guys little about logical operators and
relational operators little carefully
now as I've now just follow with me this
means greater than or equal to this
means greater than this means less than
or equal to there are other also so the
point
point is in quadrant comma Q okay this
being said this is this is how we set
the value for this how we said if if
else if else statement okay now a
program is ready let's compile this
build this with f8 and f9 and then run
this let the let me give al you 3 + 4 X
+ 4 for y ya yell the length is Phi the
angle is 53 degrees the point is in
Quadrant 1 because because x is greater
than 0 it's 3 and y is greater than 0 so
Q is set to 1 and we get it here let's
check this condition with another point
now let me just set this X to be minus 3
and write it before it's in Quadrant 2
perfect our logic is quite working out
to be fine
now run this again we guys once you guys
compile and build it as long as you
don't you didn't make any corrections to
the file you don't have to comparable to
all the time you just have to execute
with a fight that's enough okay now you
know let me give you a point minus 3 and
minus 4 this ship in Quadrant 3 yes it
does
and finally the last option the point is
in the XS for X is positive Y is
negative yeah the coil point is in
Quadrant 4 perfect
there you have it guys you're
successfully completed our program to
you know find the point find the length
or distance connecting the point and the
origin the angle that this line makes
and the quadrant admits the pointless
thank you guys for watching see you guys
the next tutorial and in the next
tutorial we'll go into a little more
detail go a little more deeper into the
relational logical operators the type of
operators available and then you call
into other other programs and dogs so
thanks for watching so see you guys
around
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Dec 27, 2024 Last updated |
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