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Error Checking Loop Java

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The body of a while loop can be executed any number of times, including zero. more hot questions lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other It's awkward to use the while loop as shown so far to solve this sort of problem. So now the test in the while loop becomes "while the input integer is not zero". his comment is here

For Loop Examples The examples below demonstrate use the basic for-loop structure and change the init, test, and increment to get all sorts of different series: 0, 1, 2, ..98, 99 For example, if we want the user to enter an even integer, we could have used the following code: System.out.print("Enter an even integer: "); number = keybd.readInt(); if(number%2==1) A data value used in this way is sometimes called a sentinel value. Draw an asterisk triangle Converting SCART to VGA/Jack What are the drawbacks of the US making tactical first use of nuclear weapons against terrorist sites? http://danshuster.com/apcs/java0306.htm

While Loop Error Checking Java

more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation The condition in a while loop can be any boolean-valued expression. They obviously have a large misconception and it's worth addressing. While Loops The for-loop can actually be understood as equivalent to a while-loop version, like this: init while (test) { body increment } So for example, we could write the standard

I answered the question. –David Wallace Mar 24 '14 at 17:56 You may have a point. How many opponents would you like to play against?"); try{ numOpponents = sc.nextInt(); retry = true; // break the loop; }catch(InputMismatchException e){ loopCount ++; if(loopCount == 5) retry = true; //number If the loop goes up to and includes the nice round value, then write the loop with <=. Java While Loop What you do is probably have the CONDITION be keep asking until a valid floor is selected, and have the check in an if statement inside the do-while loop.

How many opponents would you like to play against?"); try{ numOpponents = sc.nextInt(); retry = true; // break the loop; }catch(InputMismatchException e){ loopCount ++; if(loopCount == 5) retry = true; //number Yes I know, just saying Im actually starting in a software dev team next week and im s**ting it that my java isn't up to scratch so im writing card games Please click the link in the confirmation email to activate your subscription. for(;;) { System.out.println("\nPlease enter the floor you are on: "); current_Floor = in.nextInt(); if (current_Floor <= MAX_FLOORS) { break; } System.out.println("Please enter a floor which is less than 8"); } share|improve

The Methods The class methods accept user input as string, attempt to convert that input to the expected type. An if statement in the middle of the while loop checks for the exit condition. My adviser wants to use my code for a spin-off, but I want to use it for my own company Converting SCART to VGA/Jack Is it plagiarims (or bad practice) to Also, the test that is used at the end of the loop wouldn't even make sense at the beginning: do { Play a Game Ask user if he wants to play

How To Check Two Conditions In For Loop In Java

The first line means "loop forever", but it will actually just loop until the "break" is encountered, which happens when the user enters correct input. https://coderanch.com/t/568303/java/java/loop-exception-caught asked 3 years ago viewed 10387 times active 3 years ago Related 1138Breaking out of nested loops in Java327Syntax for a single-line BASH infinite while loop5220How to check if one string While Loop Error Checking Java do { Checkers.playGame(); System.out.print("Do you want to play again? "); wantsToContinue = TextIO.getlnBoolean(); } while (wantsToContinue == true); When the value of the boolean variable is set to false, it is Enhanced For Loop Java Null Check So you can write "while(!flag)" instead of "while (flag==false)", and you can write "if(!flag)" instead of "if(flag==false)".

Unix command that immediately returns a particular return code? this content If the user enters an odd integer, the loop will tell them they made a mistake and require them to perform the input again. Another solution in this case would have been to declare sum to be a variable of type double in the first place. Should ideal specular multiply light colour with material colour? Java Error Checking User Input

But there is another problem! Ill try that nextLine method, thanks! How To Write a While Loop To write a while-loop, we think about three parts... weblink You were a wonderful help Was This Post Helpful? 0 Back to top MultiQuote Quote + Reply ← Previous Topic Java Next Topic → Page 1 of 1 Related Java

A do..while statement has the form do statement while ( boolean-expression ); or, since, as usual, the statement can be a block, do { statements } while ( boolean-expression ); Note Should I serve jury duty when I have no respect for the judge? The type cast "(double)sum" converts the value of sum to a real number, so in the program the average is computed as "average= ((double)sum)/count;".

I don't want to enter that loop unless none of those characters are entered.

Here is the function: private static char getHighLow(Scanner keyboard) { System.out.println("High, Low, or Sevens (H/L/S): "); String choiceString = keyboard.next(); char choice = choiceString.charAt(0); while (choice != 'H' || choice != Written by Nick Parlante. In order not to repeat code, there's a good alternative. System.out.println("Please enter a floor which is less than 8"); current_Floor = in.nextInt(); while (current_Floor > MAX_FLOORS) { System.out.println("\nPlease enter the floor you are on: "); current_Floor = in.nextInt(); } Here you

In fact, a standard while loop of this form: while (test) { body } Is equivalent to a while-break loop where the break is positioned at the very top: while (true) Winston Gutkowski Bartender Posts: 10527 64 I like... This is seemingly a very simple task of checking that a user has entered an int and nothing else using the Scanner class (represented by 'sc'). http://oncarecrm.com/error-checking/error-checking-vbs.html If the user types anything else, the loop will return an error message and repeat the request.

If the for-loop stops at 1 less than some nice round value, such as stopping at 99, then it's better to write the test using < and the nice round value inputIsValid) The flow, imho, is more intuitive. Why was there a 2nd version of the Molotov-Ribbentrop Pact that gave Lithuania to USSR? java loops message do-while share|improve this question edited Mar 24 '14 at 17:49 ArtB 7,1531463104 asked Mar 24 '14 at 17:47 user2863681 125 closed as off-topic by njzk2, Jigar Joshi, BackSlash,

I have gotten rid of the askForNumPlayers method and am trying a similar thing here. In that case, we might write an infinite loop on purpose by giving true as the test: while (true) { // deliberate infinite loop ... ... } Many computer people like The while-loop follows these steps: Check if the test is true or false. We are using BlueJ as our IDE.

posted 4 years ago Winston Gutkowski wrote: Joanne Neal wrote:That's because the sc.nextInt doesn't actually get the f off the input stream, it just throws the exception leaving the f still The do loop makes sense here instead of a while loop because with the do loop, you know there will be at least one game. Suppose as a sort of James Bond example, we have a Vault object with something locked up inside of it, and it responds to a tryCode(int code) message that returns true public int findCode(Vault vault) { for (int i=0; i<=1000000; i++) { if (vault.tryCode(i)) { // found the code!

Hi f. This is the way it's supposed to work. On the other hand, the computer is happy to execute the code we specify a million times over, which is its own sort of power. It sure did for me!

Accepts String, int, double or float. * @param type Which type to test against. First time this condition always failed even if the number was ok, very strange behaviour so I gave up on the error checking for the moment as its not entirely necessary. Some loops do not have any identifiable work in the body. This might seem like a minor point, but a careful programmer should cover all the bases.

share|improve this answer edited Mar 24 '14 at 18:28 answered Mar 24 '14 at 17:55 Henry Keiter 11k41951 Ah ok, thanks dude, i've only been learning java for about In a lot of cases, by doing 1, you can figure out the solution by yourself. –Adrian Shum Nov 24 '14 at 3:29 Sorry about that. I'd recommend sticking with a while loop since your initial pass is a little different from each subsequent one. Ill try that nextLine method, thanks!