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Back to Question 10

Answer 9 .

D. 6.0

Explanation 9

Declare and initialize two local variables

This program declares and initializes two local variables, one of type double and the other of type int . Each variable is initialized with the integer value 3.

Automatic conversion to floating type double

However, before the value of 3 is stored in the double variable, it is automatically converted to type double .

Automatic conversion in mixed-type arithmetic

Numeric addition is performed on the two variables. Whenever addition is performed between a floating type and an integer type, the integer type isautomatically converted to a floating type and floating arithmetic is performed.

A floating result

This produces a floating result. When this floating result is passed to the println method for display, a decimal point and a zero are displayed to indicate a floating type, even though in this case, the fractional part of theresult is zero.

Back to Question 9

Answer 8 .

A. Compiler Error

Explanation 8

Initialize boolean variable to true

This program declares and initializes a boolean variable with the value true . Then it attempts to add the literal value 1 to the value stored in the boolean variable named myVar .

Arithmetic with boolean values is not allowed

As mentioned earlier, unlike C++, boolean types in Java cannot participate in arithmetic expressions.

Therefore, this program will not compile. The compiler error produced by this program under JDK 1.3 reads partially as follows:

Ap007.java:13: operator + cannot be applied to int,boolean System.out.println(1 + myVar);

Back to Question 8

Answer 7 .

D. false

Explanation 7

Format for variable initialization

This program declares a local boolean variable and initializes it to the value true . All variables, local or otherwise, can be initialized in this manner provided that the expression on the right of the equal sign evaluates toa value that is assignment compatible with the type of the variable. (I will have more to say about assignment compatibility in a future module) .

Value is changed before display

However, before calling the println method to display the initial value of the variable, the program uses the assignment operator (=) to assign the value false to the variable. Thus, when it is displayed, the value is false .

Back to Question 7

Answer 6 .

A. Compiler Error

Explanation 6

A local boolean variable

In this program, the primitive variable named myVar is a local variable belonging to the method named printBoolean .

Local variables are not automatically initialized

Unlike instance variables, if you fail to initialize a local variable, the variable is not automatically initialized.

Cannot access value from uninitialized local variable

If you attempt to access and use the value from an uninitialized local variable before you assign a value to it, you will get a compiler error.The compiler error produced by this program under JDK 1.3 reads partially as follows:

Ap005.java:13: variable myVar might not have been initialized System.out.println(myVar);

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
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
Google
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
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
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
Brian Reply
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?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
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 ?
Bob Reply
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?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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