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The good news

The good news about doing arithmetic using operands of integer types is that as long as the result is within the allowable value range for the wider of theinteger types, the results are exact (floating arithmetic often produces results that are not exact) .

The bad news

The bad news about doing arithmetic using operands of integer types is that when the result is not within the allowable value range for the wider of theinteger types, the results are garbage, having no usable relationship to the correct result (floating arithmetic has a high probability of producing approximately correct results, even though the results may not be exact).

For this specific case ...

As you can see by the answer to this question, when a value of 2 was added to the largest positive value that can be stored in type int , the incorrect result was a very large negative value.

The result is simply incorrect. (If you know how to do binary arithmetic, you can figure out how this happens.)

No safety net in this case -- just garbage

Furthermore, there was no compiler error and no runtime error. The program simply produced an incorrect result with no warning.

You need to be especially careful when writing programs that perform arithmetic using operands of integer types. Otherwise, your programs mayproduce incorrect results.

Back to Question 6

Answer 5

C. 4.294967294E9

Explanation 5

Mixed-type arithmetic

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

Declare and initialize an int

The method named doMixed declares a local variable of type intnamed 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 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 theoperand of the wider type, and the arithmetic is performed on the basis of the wider type.

Result is of the wider type

The type of the result is the same as the wider type.

In this case ...

Because the left operand is type double , the int value is converted to type double and the arithmetic is performed as type double .

This produces a result of type double , causing the floating value 4.294967294E9 to be displayed on the computer screen.

Back to Question 5

Answer 4

C. 2147483647

Explanation 4

Uses a cast operator

This program, named Ap013.java , differs from the earlier program named Ap012.java in one important respect.

This program uses a cast operator to force the compiler to allow a narrowing conversion in order to assign a double value to an int variable.

The cast operator

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
what's the program
what chemical
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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