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Floating divide by zero

The program in Listing 4 attempts to divide the double value of -11 by the double value of zero.

No runtime error with floating divide by zero

In the case of floating types, an attempt to divide by zero does not produce a runtime error. Rather, it returns a value that the println method interprets and displays as either Infinity or -Infinity .

What is the actual value?

The actual value returned by the division operation in this program is the value of a static final variable in the Double class named NEGATIVE_INFINITY . (There is also a value for POSITIVE_INFINITY .)

Is this a better approach?

As you learned earlier, if you attempt to divide by zero with integer arithmetic, an exception will be thrown. Is this a better approach than throwing an exception?I will let you be the judge of that. The important thing is that you know what will happen in both cases and beprepared to deal with the consequences.

In either case, you could test the right operand before the divide to ensure that it isn't equal to zero, and then take appropriate action if it is zero.

Cannot use exception handling in this case

For floating divide by zero, you cannot handle the problem by using try-catch because an error or exception won't be thrown.However, you can test the result following the divide to see if it is equal to either of the infinity values mentioned above . Note, however, that you will need to test against the constant values shown above and not against the output produced by the println method.

And the correct answer to the question is...

C. -Infinity

Mixed-type arithmetic

What output is produced by the program shown in Listing 5 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 4.294967294E9
  • D. 4294967294
Listing 5 . Mixed-type arithmetic.
public class Mixed01{ public static void main(String args[]){ new Worker().doWork();}//end main() }//end class definitionclass Worker{ public void doWork(){//Integer.MAX_VALUE = 2147483647 int myIntVar = Integer.MAX_VALUE;System.out.println(2.0 * myIntVar); }//end doWork()}//end class definition

This program illustrates the use of arithmetic operators with operands of different types.

Declare and initialize an int

The method named doWork declares a local variable of type int named myIntVar and initializes it with the largest positive value that can be stored in type int .

Evaluate an arithmetic expression

An arithmetic expression involving myIntVar is evaluated and the result is passed as a parameter to the println method where it is displayed on the computer screen.

Multiply by a literal double value

The arithmetic expression uses the multiplication operator (*) to multiply the integer value stored in myIntVar by 2.0 (this literal operand is type double by default) .

Automatic conversion to wider type

When arithmetic is performed using operands of different types, the type of the operand of the narrower type is automatically converted to the type of the operand of the wider type, and the arithmetic is performed on the basis of the wider type.

(By narrower and wider, we mean the width of the range of values that can be accommodated by the type in question.)

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
hey
Giriraj
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
ya I also want to know the raman spectra
Bhagvanji
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Ap computer science a, clarification of the java subset. OpenStax CNX. Oct 03, 2015 Download for free at https://legacy.cnx.org/content/col11279/1.5
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