# 7.3 Ap0030: self-assessment, relational operators, increment operator  (Page 7/9)

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A switch structure

There is a somewhat more specialized, control structure named switch that can also be used to make decisions in a multiple choice sense under certain fairlyrestrictive conditions.

However, the structure shown in this program can always be used to replace a switch. Therefore, I find that I rarely use the switch structure, opting instead for the more general form of multiple-choicestructure.

D. Goodbye World

## Explanation 9

An if-else control structure

This program contains a simple if-else control structure.

Behavior of if-else structure

If the expression in the conditional clause returns true, the block of code following the conditional clause is executed, and the block of code followingthe word else is skipped.

If the expression in the conditional clause returns false, the block of code following the conditional clause is skipped, and the block of code following theword else is executed.

This program executes the else block

In this program, the expression in the conditional clause returns false.

Therefore, the block of code following the word else is executed, producing the words Goodbye World on the computer screen.

Can result in very complex structures

While the structure used in this program is relatively simple, it is possible to create very complex control structures by nesting additional if-else structures inside the blocks of code.

D. Hello World

## Explanation 8

A simple if statement

This program contains a simple if statement that

• uses a relational expression
• to return a value of type boolean inside its conditional clause

Tests for x less than y

The relational expression tests to determine if the value of the variable named x is less than the value of the variable named y .

Since the value of x is 5 and the value of y is 6, this relational expression returns true.

Behavior of an if statement

If the expression in the conditional clause returns true, the block of code following the conditional clause is executed

What is a block of code?

A block of code is one or more statements surrounded by matching curly brackets.

For cases like this one where the block includes only one statement, the curly brackets can be omitted. However, I prefer to put them there anyway. Theydon't cause any harm and help me avoid programming errors if I come back later and add more statements to the body of the if statement.

Display the word Hello

In this program, execution of the code in the block causes the print method to be called and the word Hello to be displayed followed by a space, but without a newline following the space.

What if the conditional clause returns false?

If the expression in the conditional clause returns false, the block of code following the conditional clause is bypassed.

(That is not the case in this program.)

After the if statement ...

After the if statement is executed in this program, the println method is called to cause the word World to be displayed on the same line as the word Hello .

A. Compiler Error

where we get a research paper on Nano chemistry....?
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
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