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Video Title: Structured Charts
Description: Structured Charts
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited
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In this session, we are going to discuss
structure charts.

And what are the different components
will be required while

drawing the structure charts
will be discussed in this session.

And what is the difference
between this DFD

and structure chart
also that will be covered.

So, structure chart is a chart derived
from the data flow diagram.

So, in the earlier video, we have
discussed the data flow diagram.

So, this video is in the continuation of
that.

So, it represents the system into more
details than DFD.

It breaks down the entire system into
lowest functional module.

So, that is the main issue.

So, it will have some
representation where

the lowest functional
modules will be derived.

And describe functions and sub-functions
at each module of a system to a greater

detail which was absent in case of our
DFD.

So, structured
chart represents hierarchical structure

of modules and
each layer a specific task is performed.

So, let us go with some diagrams for the
better understanding.

So, here are the symbols used in the
construction of the structure chart.

So, let us start our discussion with
module.

So, it represents process or sub-routine
or a task.

So, a module is nothing
but a process or it

can be also called
as a sub-routine or a task.

A control module branches to more than one
sub-modules.

So, whenever we are having some
conditional statements are there,

some conditions are there, then depending
upon the condition true and false,

it will be having multiple branches.

So, library modules are reusable and
invocable from any module.

So, where the library?

Library means where we will be having some
pre-written function bodies.

The pre-written function bodies will be
there in the library.

And that very library
module can be referred by

multiple different other
modules as when required.

So, it is reusable.

So, just consider this one.

Here we are having
This control module and from where the

controls can be transferred to multiple
different modules.

So, these are the sub-modules and this is
our library module.

Let us, we are going for the condition.

So, it is represented by a small diamond
at the base of the module.

So, now you see this
module is nothing but a

process or a sub-routine or a certain
task.

And here you see in case of structured
charts, the modules are getting

represented using one rectangle.

But whenever some
condition is there, then this

diamond will
be there at the bottom of this module.

And it depicts that the control module can
select any warning, any one of the

sub-routine based on some condition true
or false.

So, this condition is there.

So, depending upon the condition true or
false, so which module is going to get

executed, we are going to get the control
and that will be decided.

So, now also we have the jump.

And arrow is shown pointing inside the
module to depict that the control will

jump in the mode in the middle of the
sub-module.

So, now here you see this particular line
is in the middle of this module.

So, it is denoting a jump.

So, this sort of representations can
happen in our structured charts.

So, loop.

A curved arrow represents loop in the
module.

All sub-modules covered by loop repeat
execution of the module.

So, this is our loop.

So, that is one curve is there.

You can find this one.

So, this is denoting a loop in the module.

Now, the next one is our data flow.

A directed arrow with empty circle at the
end represents the data flow.

So, now here you can
find this empty circle and this directed

arrow is denoting the
data flow between these two modules.

And the last one is our control flow.

So, a directed arrow with the field circle
at the end represents the control flow.

So, we are having the data flow.

We are having this control flow.

The basic difference here is that,
in case of data flow, this circle is empty.

But in case of control flow, this circle
is filled up.

So, in this way, we had so many different
symbols.

So, many different symbols we have
discussed.

So, there we are having this module.

And then here, we are having this
condition.

This condition, depending upon the
condition, whether this condition is true

or false, either one of the module will
You get executed.

Then we are having this jump.

This control line has come within this
particular rectangular box.

So, that is the jump statement.

And this is our loop.

We know this is the circle which is having
the arrow head is denoting the loop.

And here you see
within this particular this

arc, this is these two
modules are included.

So, that means these
two modules will go on

repeating
along with this iteration and looping.

So, here we are having this data flow that
It is an empty circle with this arrowhead.

And we are having this control flow that
is filled circle with the arrowhead.

So in this way, in our discussion,
we have discussed what are the different

components of a structured chart and how
to use this one.

Thanks for watching this video.