RE: quick java question
- From: "Sina Bahram" <sbahram@xxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 23:57:33 -0500
I emailed you about this off list, but please pay very close attention to
what you are calling .hasNextFloat on.
Take care,
Sina
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Parks
Sent: Thursday, November 29, 2007 11:32 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: quick java question
I think I found what is going on. In your example you don't get input until
after you call hasNext... but in my program I call it after I get input.
I, too, am quite tired and am heading to bed, but tomorrow when I can type
straight I will play with the arrangement of all those little statements
until I get something like your example instead of its opposite. Thanks
again.
Have a great day,
Alex
> ----- Original Message -----
>From: "Jeffrey Fidler" <jfiddler2@xxxxxxxxxxx
>To: <programmingblind@xxxxxxxxxxxxx
>Date sent: Thu, 29 Nov 2007 23:12:51 -0500
>Subject: Re: quick java question
>This will test for a double. Not exactly elegant -- I just did a
"find and
>replace" to get you the double. Compiled and tested just in case
my tired
>mind has completely stopped working, but it is all ok. :) The
neat thing I
>noticed is that you'll get an integer number to work here, too as
it seems
>that the Scanner class will do the conversion from int to double
for you.
>In any case, I'm truly off to bed now!
>import java.util.Scanner;
>public class TestDbl {
> public static void main(String[] args) {
> System.out.print("Please enter a double: ");
> Scanner sc = new Scanner(System.in);
> if (sc.hasNextDouble()) {
> System.out.println("Your double is " + sc.nextDouble());
> } else {
> System.out.println("You did not enter an double!");
> }
> }
>}
>Kind regards,
>Jeff
>----- Original Message -----
>From: "Alex Parks" <mehgcap@xxxxxxx
>To: <programmingblind@xxxxxxxxxxxxx
>Sent: Thursday, November 29, 2007 11:07 PM
>Subject: Re: quick java question
>> Thanks. My var is a double called bet (the assignment was a
blackjack
>> game, and no you are not helping me cheat by helping--we can use
whatever
>> to get it done). I am ensuring bet is valid; that is, above 0,
below the
>> user's current balance, and a number and not a letter. I have:
>> if (bet<pts || bet>0 || bet.hasNextDouble()
>> I get an error about bet not being able to be dereferenced.
>> Have a great day,
>> Alex
>>> ----- Original Message -----
>>>From: "Jeffrey Fidler" <jfiddler2@xxxxxxxxxxx
>>>To: <programmingblind@xxxxxxxxxxxxx
>>>Date sent: Thu, 29 Nov 2007 22:53:27 -0500
>>>Subject: Re: quick java question
>>>Here is an example using an integer. (Sorry, but I had not
>> remembered that
>>>you were using a double when I began quickly working up this
>> example, and
>>>I'm off to bed for now.) Remember that if you enter a char type,
>> it will
>>>still work as it will output the ascii value! You can swap the
>> int for a
>>>double and it should work. Hope this helps!
>>>import java.util.Scanner;
>>>public class TestInt {
>>>public static void main(String[] args) {
>>>System.out.print("Please enter an integer: ");
>>>Scanner sc = new Scanner(System.in);
>>>if (sc.hasNextInt()) {
>>>System.out.println("Your integer is " + sc.nextInt());
>>>} else {
>>>System.out.println("You did not enter an integer!");
>>>}
>>>}
>>>}
>>>Kind regards,
>>>Jeff
>>>----- Original Message -----
>>>From: "Sina Bahram" <sbahram@xxxxxxxxx
>>>To: <programmingblind@xxxxxxxxxxxxx
>>>Sent: Thursday, November 29, 2007 10:19 PM
>>>Subject: RE: quick java question
>>>> If you'd like some help on this tonight, shoot me the file off
>> list ...
>>>> I'm
>>>> busy tomorrow, but hopefully Suzanne can help you then, if we
>> don't get
>>>> it
>>>> tonight?
>>>> sbahram@xxxxxxxxx
>>>> Take care,
>>>> Sina
>>>> -----Original Message-----
>>>> From: programmingblind-bounce@xxxxxxxxxxxxx
>>>> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Alex
>> Parks
>>>> Sent: Thursday, November 29, 2007 9:55 PM
>>>> To: programmingblind@xxxxxxxxxxxxx
>>>> Subject: RE: quick java question
>>>> Okay, thanks! I will attach the .java file to an email and send
>> it to you
>>>> privately. It will save my poor cs professor from answering all
>> my
>>>> questions and give me a new perspective. Thanks again.
>>>> Have a great day,
>>>> Alex
>>>>> ----- Original Message -----
>>>>>From: "Suzanne Balik" <spbalik@xxxxxxxxxxxxxx
>>>>>To: programmingblind@xxxxxxxxxxxxx
>>>>>Date sent: Thu, 29 Nov 2007 21:30:35 -0500 (EST)
>>>>>Subject: RE: quick java question
>>>>>You typically use double's rather than float's in Java. How
>>>> about this --
>>>>>would this work for you?
>>>>>Scanner sc = new Scanner(System.in); if (sc.hasNextDouble())
>>>>> double value = sc.nextDouble();
>>>>>I'll be in my office some time after 3:00 PM tomorrow (Friday).
>>>> If you
>>>>>want to send me your code, I can help you with it then.
>>>>>Suzanne Balik
>>>>>> I tried it, but have changed the var to a float after I sent the
>>>>>> message. I tried var.hasNextFloat() but I get an error on that
>> line
>>>>>> that says something like "float cannot be dereferenced". I am
>>>>>> checking to be sure a number (the var in question) is greater
>> than 1
>>>>>> but less than another var and so thought I could just put this
>> simple
>>>>>> statement as another condition in the if statement, but I got
>> the
>>>>>> above error. I am using the latest Java.
>>>>>> Have a great day,
>>>>>> Alex
>>>>>>> ----- Original Message -----
>>>>>>>From: "Suzanne Balik" <spbalik@xxxxxxxxxxxxxx
>>>>>>>To: programmingblind@xxxxxxxxxxxxx Date sent: Thu, 29 Nov 2007
>>>>>>>21:00:11 -0500 (EST)
>>>>>>>Subject: RE: quick java question
>>>>>>>You can use the Scanner class to do what you want to do easily,
>>>>>> if you're
>>>>>>>using Java 5.0. For example,
>>>>>>>Scanner sc = new Scanner(System.in); if (sc.hasNextInt())
>>>>>>> int value = sc.nextInt();
>>>>>>>Suzanne Balik
>>>>>>>NC State University EB II 2318 (919)515-5617
>>>>>>>We'll take a cup o' kindness yet, for auld lang syne.
>>>>>>> --Robert Burns
>>>>>>>> Do a search for
>>>>>>>> Try catch tutorial
>>>>>>>> Try statements and catch clauses are the way to go if you are
>>>>>> going to
>>>>>>>> seriously work with java.
>>>>>>>> -----Original Message-----
>>>>>>>> From: programmingblind-bounce@xxxxxxxxxxxxx
>>>>>>>> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of
>>>>>>>> Alex
>>>>>> Parks
>>>>>>>> Sent: Thursday, November 29, 2007 7:55 AM
>>>>>>>> To: programmingblind@xxxxxxxxxxxxx
>>>>>>>> Subject: RE: quick java question
>>>>>>>> I am new to this language. What do I put in place of "aString"
>>>>>>>> and how do I use the exception in my if statement? Add a
>>>>>>>> throwsException to the end? Thanks.
>>>>>>>> Have a great day,
>>>>>>>> Alex
>>>>>>>>> ----- Original Message -----
>>>>>>>>>From: "Sina Bahram" <sbahram@xxxxxxxxx
>>>>>>>>>To: <programmingblind@xxxxxxxxxxxxx Date sent: Thu, 29 Nov 2007
>>>>>>>>>07:07:27 -0500
>>>>>>>>>Subject: RE: quick java question
>>>>>>>>>If you're expecting an integer, then you can do
>>>>>>>>>Integer.parseInt(aString)
>>>>>>>>>That will throw a NumberFormatException if it isn't a number.
>>>>>>>>>Take care,
>>>>>>>>>Sina
>>>>>>>>>-----Original Message-----
>>>>>>>>>From: programmingblind-bounce@xxxxxxxxxxxxx
>>>>>>>>>[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of
>>>>>>>>>Alex
>>>>>>>> Parks
>>>>>>>>>Sent: Thursday, November 29, 2007 12:51 AM
>>>>>>>>>To: programmingblind@xxxxxxxxxxxxx
>>>>>>>>>Subject: quick java question
>>>>>>>>>Hi all,
>>>>>>>>>Is there a quick way of determining if the user input is a
>>>>>>>> number? I need it
>>>>>>>>>to be a number; it throws an exception and exits the program if
>>>>>>>> it isn't.
>>>>>>>>>Maybe something like:
>>>>>>>>>if (input!=\int
>>>>>>>>>I have no idea about the syntax, but something along those
>>>>>>>>>lines
>>>>>>>> is what I
>>>>>>>>>am looking for. Thanks for any help.
>>>>>>>>>Have a great day,
>>>>>>>>>Alex
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