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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

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
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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