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Exercise Write equivalent programs using a while loop and a do-while loop.

Counting with for statements

Concept Although all loop structures can be programmed as while loops, one special case is directly supported: writing a loop that executes a predetermined numberof times. The for statement has three parts:

for (int i = 0; i<N; i++)

The first part declares a loop control variable and gives it an initial value. The second part contains the exit condition: the loop body will be executedas long as the expression evaluates to true. The third part describes how the value of the control variable is modified after executing the loop body.The syntax show is the conventional one for executing a loop N times.

Program: Control06.java

// Learning Object Control06 //    counting with for statementspublic class Control06 {     static final int N = 6;    public static void main(/*String[] args*/) {        int factorial = 1;         for (int i = 0; i < N; i++)             factorial = factorial * (i+1);        System.out.println(factorial);     }}

This program computes the first six factorials in a for loop and the last value is printed.

  • The constant N and the variable factorial are allocated and initialized.
  • The control variable i is allocated and initialized.
  • The expression i<N is evaluated and evaluates to true.Jeliot displays Entering the for loop .
  • The loop body is executed.
  • The control variable is incremented as specified in the third part of the for statement.
  • The previous three steps are repeated until the expression evaluates to false; this causes the loop to be exited. Jeliot displays Continuing the for loop as long as the expression evaluates to true, and Exiting the for loop when it evaluates to false.
  • The final value of factorial is printed.
  • Important : when the loop is exited, the control variable is deallocated and no longer exists.

Exercise Rewrite the program using a while loop.

General for statements

Concept Arbitrary expressions can be given for the initial value of the for statement, the exit condition, and the modification of the control variable.

Program: Control07.java

// Learning Object Control07 //    General for statementspublic class Control07 {     static final int N = 100;    public static void main(/*String[] args*/) {        int sum = 0;         for (int i = 0; i < Math.sqrt(N); i = i + 3)             sum = sum + i;        System.out.println(sum);     }}

This program computes the sum of multiples of three that are less than the square root of N .

  • The constant N and the variable sum are allocated and initialized.
  • The control variable i is allocated and initialized.
  • The expression i<Math.sqrt(N) is evaluated and evaluates to true. Jeliot displays Entering the for loop .
  • The loop body is executed.
  • The control variable is incremented by three as specified in the third part of the for statement.
  • The previous three steps are repeated until the expression evaluates to false; this causes the loop to be exited. Jeliot displays Continuing the for loop as long as the expression evaluates to true, and Exiting the for loop when it evaluates to false.
  • The final value of sum is printed.
  • Important : when the loop is exited, the control variable is deallocated and no longer exists.

Questions & Answers

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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Learning objects for java (with jeliot). OpenStax CNX. Dec 28, 2009 Download for free at http://cnx.org/content/col10915/1.2
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