Thanks for your reply.
Okay. Let's discuss language. In the paragraph below you us the term
initialization. What does that mean?
Does it mean the same as I've heard instantiate a variable and declare
a variable? Then you use the term "index variable" what does that
mean? I know what a variable is
but what do you mean by "index"?
Regarding the while statement. The following code doesn't work as
planned but it shows my understanding of the
use of the "while loop". It's a real world example. I think the
courses should use real world examples. The use of displaying names
20 times doesn't make much since to me.
<pre><code>
import javax.swing.JOptionPane;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Phillip
*/
public class MyTestProject {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int temp = 0;
String findTemp=JOptionPane.showInputDialog("Enter the temp!");
while(temp > 0) {
if (temp <102 && temp > 78) {
JOptionPane.showMessageDialog(null, "The tempurature is " + temp +
". Turn the air conditioning on!");
}
else if (temp > 102) {
JOptionPane.showMessageDialog(null, "The tempurature is " +
temp +
". Let's go North!");
}
else {
JOptionPane.showMessageDialog(null, "The tempurature is " +
temp + ". We don't need air conditioning! We need something else!");
}
}
}
</code></pre>
Regarding the "for loop":
What I understand the word "for" would be a situation like this.
For? What does that mean in a real world situation?
If someone said to me, "for" each "item" you will pay "this amount". I
would understand that.
I don't understand the program language that says "for" each "1 item"
add another 1 to it until you get to 20. What application does that
have?
Can you give me a real world application for the use of for?
Thanks for your time
This is education not copying and pasting code to make beleive
knowledge.
On Jun 20, 3:36 pm, Robert Childers <[email protected]>
wrote:
> First off a little pseudo code.
> for (int i=1;i<limit;i++) {
> statment block
>
> }
>
> int i=1;
> while (i<limit) {
> statment block
> i++;}
>
> In the for loop, the initialization of the variable is handled in the
> structure of the loop. But if you looked at that actual code that is
> produced, you would see the the for loop consists of a initialization
> of the index variable, followed by a comparison and branch statement
> past the end of the block, finally you would have the block, an
> increment of your variable and a jump back to the comparison test at
> the start of your loop.
>
> All of this is being done explicitly with the while loop as statements
> before you enter the loop, and the while loop construct. Since the
> variable has to be initialized outside of the looped statements it
> occurs before the while () statement. in the for() statement the
> initialization is done prior to the looping of the repeated statements
> by the for loop construct.
>
> Since a while loop's construct is only for a test to stop the looping,
> you have to put your increment inside the body of the loop, usually as
> the last statement of the looped statements.
>
> For loops are much clearer to read when dealing with a loop that has a
> index that is incremented and tested.
>
> While loops on the other hand are useful for non indexed as well as
> indexed types of loops
>
> Example
> EOF=false;
> While (~EOF) {
> read one line and process}
>
> Here EOF is some variable that is set to false and is changed to true
> when the end of the file is reached. and my statement block is to read
> the file one line at a time. There is no way to know the length of the
> file you are reading before hand like you can know the length of an
> array, so you can't use a for loop. Thus a while loop is more general,
> but you have to handle your initialization and setting of the variable
> used in the loop test.
>
> On Jun 19, 10:12 pm, "function(phil)" <[email protected]> wrote:
>
>
>
> > Howdy again. Okay. I've looked over the process of changing a "for
> > loop" to a "while loop". I've seen examples that break the variable i
> > and the statement i++ out of parameters of the initial for block of
> > code. I can write the code but understanding why those two areas are
> > removed outside the block is not explaned. Can someone discuss with me
> > why the for and while loops are different in this way. What is the
> > logic and which is better to use in what situations? I refuse to go
> > through this course copying code to complete the home work
> > assignments, without understanding what is going on!
> > Thanks
>
> > Phil- Hide quoted text -
>
> - Show quoted text -
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