Hi, When I use an Iterator of Object I use a while loop (as written in every book learning Java, as Thinking in Java of Bruce Eckel): Iterator it=... while(it.hasNext()){ //... } but sometime i saw than instead somebody use the for loop: Iterator it=... for (Iterator it=...; it.hasNext();;){ //... } I dont' understand this...
The question field is a bit too short to pose my real question. If anyone can recapitulate it better, please feel free. My real question is this: I'm reading a lot of other people's code in C# these days, and I have noticed that one particular form of iteration is widely spread, (see in code). My first question is: Are all these iter...
<?php $i = 0; while(conditionals...) { if($i == 0) print "<p>Show this once</p>"; print "<p>display everytime</p>"; $i++; } ?> Would this only show "Show this once" the first time and only that time, and show the "display everytime" as long as the while loop goes thru? ...
How do I exit a while loop immediately without going to the end of the block? e.g. while(choice!=99) { cin>>choice; if (choice==99) //exit here and don't get additional input cin>>gNum; } any ideas? ...
Closing this question. Will drink red bull. Sleep. Code and come back with brand spanking new question with unit test cases. UPDATE: The new file is here Also the config file is here I refactored the code again: sub getColumns { open my $input, '<', $ETLSplitter::configFile or die "Error opening '$ETLSpliter::configFile':...
Looks like while( condition ) { //do stuff } is completely equivalent to for( ; condition; ) { //do stuff } Is there any reason to use the latter instead of the former? ...
I have the following button in my swing interface private void solveButtonMouseClicked(java.awt.event.MouseEvent evt) { step1(); } which calls step1(); private void step1(){ //step 1 solving the white cross around the yellow middle while( (!(F2.getBackground().equals(w...
I can't for the life of me see why I can not read the postPrioity outside the while loop. I tried "export postPrioity="500"" still didn't work. Any ideas? -- or in plan text -- #!/bin/bash cat "/files.txt" | while read namesInFile; do postPrioity="500" #This one shows the "$postPrioity" varible, as '500' echo "weeeeeeeeee --...
Why when I entered the loop below and I type something the first instruction cmdstd:getline(std::cin,cmdInput); does not read the input entered. For instance if I entered "b 8" it should display "cmd is b 8", but it skips to the next read std::getline(std::cin, input); and displays "it is b" instead while (editingMode == TRUE) { std...
Hi, can I put a for loop in while loop? For example: while($end = 1) { for ($i = 0; $i < count($match); $i++) { $mathcas = $match[$i][1]; } } Thanks. :) ...
Hi, I'm learning C with The C Programming Language (K&R). Since I don't particularly want to bob back and forth between a text editor and running gcc, I've decided to use xcode as an IDE. So far, I've been able to follow the book's examples without a problem up until section 1.5.2. When given the valid (?) program... #include <stdio.h...
Hi, I've only just recent began learning C++ and am having a little issue with while loops when the condition for the while loop is an input, of type double, from the user. I understand that if the user doesn't enter a value compatible with the double type then the loop is automatically broken. The issue is my console application exits u...
Hi I have a function that generates a random combination. my function looks like this: function random_gen($length) { $random= ""; srand((double)microtime()*1000000); $char_list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; $char_list .= "abcdefghijklmnopqrstuvwxyz"; $char_list .= "1234567890"; // Add the special characters to $char_li...
I have been trying out some basic exercises involving loops. Can someone tell me why the following snippets have different outputs? While Loop while (i<3) { while(j<3) { printf("(%d %d) ",i,j); j++; } i++; } Output (0 0) (0 1) (0 2) For Loop for(i=0;i<3;i++) { for(j=0;j<3;j++) ...
I am trying to generate a PDF that outputs Item Names onto a template PDF (using FPDI) with the Username listed on the top of each page. Every user can have a different number of items (i.e. if there are 1-4 items, only output one page; if there 5-8 items, output two pages, etc.) Here is an example of what I am trying to do: http://www...
When implementing an infinite loop, is there a difference in using while(1) vs for(;;) vs goto? Thanks, Chenz ...
I've done a small experiment as will be shown below and it looks like that a while loop is faster than a for loop in Perl. But since the experiment was rather crude, and the subject might be a lot more complicated than it seems, I'd like to hear what you have to say about this. Thanks as always for any comments/suggestions :) In the fo...
I've written a program to get a string input from a user and parse it into tokens and move a robot according to the input. My problem is trying to issue more than one command. The code looks like: void Navigator::manualDrive() { const int bufSize = 42; char uinput[bufSize]; char delim[] = " "; char *token; while(t...
I'm reading an ebook on PHP right now, and the author noted that the difference between a while loop and a for loop is that the for loop will count how many times it runs. So take this: <?php for ($i = 1; $i < 10; $i = $i + 1) { print "Number $i\n"; } ?> But wouldn't this be the same as <?php $i = 1; wh...
Hi, I've seen the following code, taken from the libb64 project. I'm trying to understand what is the purpose of the while loop within the switch block - switch (state_in->step) { while (1) { case step_a: do { if (codechar == code_in+length_in) { st...