Homework help

Hey everyone. I have a quickie ( probably easy question for most ) to ask. I have to write a program ( which i'm currently writing ) that reads user input ( I've imported the Scanner class for this ) of an email address. I'm suppose to run a loop that checks each letter one by one for an @ character. If there is only one @ character. I print out that it is a valid email otherwise print out that the email is invalid. My question is I would a do/while loop work best for this? ( considering I won't know the span of the email address) and if so how would I deal with the @ character ( since I know its not considered an int or something ) Thanks in advance for the help

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Originally Posted by noobster

... ( considering I won't know the span of the email address) and if so how would I deal with the @ character ( since I know its not considered an int or something ) Thanks in advance for the help

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You will know the length of the String though since String has a length() method that returns this int. A general rule that you probably already know is, any time you know in advance how many times a loop will iterate, use a for loop, and so I recommend a for loop.

Best of luck with your assignment and your Java studies! :)

I would use a for loop checking charAt() String method through each iteration for the @ symbol. A counter variable to count how many times the @ symbol appears.

Hmmm too slow :)

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Originally Posted by al_Marshy_1981

Hmmm too slow :)

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.............. :)

Do you have to use a loop? Impress your teacher by doing RegEx email validation... or he may not accept it since he probably explictly said to do it in a loop. :)

thanks guys for the help I really appreciate it. yea, the instructions says I do have to write a loop.

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Originally Posted by noobster

thanks guys for the help I really appreciate it. yea, the instructions says I do have to write a loop.

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OK, but were you able to solve your problem with the advice given above?

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Originally Posted by al_Marshy_1981

Hmmm too slow :)

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I'm sorry I'm afraid I don't understand this ( but I feel it might be a joke at my expense :confused: )
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as for the helping I'm writing my program later this afternoon and will post it tonight if I get the chance to.

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Originally Posted by noobster

I'm sorry I'm afraid I don't understand this ( but I feel it might be a joke at my expense :confused: )

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doubt it, looks like its because Fubarable posted a response seconds before al_Marshy_1981 did

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Originally Posted by al_Marshy_1981

Hmmm too slow :)

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Originally Posted by gmarut

doubt it, looks like its because Fubarable posted a response seconds before al_Marshy_1981 did

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guess your right
:D

Indeed, it was because Fubarable posted just before me

hey guys here it is::: with problems :(. I keep getting an else without if error. any help?
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Code:

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/*
 * Chapter 6 Question 62
 */
 
import java.util.Scanner;
 
 public class Chapter6Question62
 {
        public static void main( String [] args )
        {
                //char a = ' @ ';       
                Scanner scan = new Scanner ( System.in );
                System.out.print( " Please enter your email address " );
                String email1 = scan.next();
               
  int count = 0;
          for ( count = 0; count >= 20; count ++ )
                  if ( email1.charAt('@') == '@') count ++;
                  //( count >= 1)
          {
                  System.out.println( " That email address was vaild " );       
          }else{
                  System.out.println(" That email address isn't vaild " );
          }
 

        }
 }

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Moderator Edit: code tags added

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Originally Posted by noobster

hey guys here it is::: with problems :(. I keep getting an else without if error. any help?

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Indeed your else is not on the same level as the if, so there's no surprise that you're getting error messages. You'll want to enclose all if blocks, else blocks, for loops, while loops, shoot any blocks or loops inside of curly braces and you'll want to format your code well. Do that and these types of errors will become obvious to you.


Also, when posting code here, please use code tags so that your code will retain its formatting and thus will be readable -- after all, your goal is to get as many people to read your post and understand your code as possible, right? I've added tags to your code above.

To do this, highlight your pasted code (please be sure that it is already formatted when you paste it into the forum; the code tags don't magically format unformatted code) and then press the code button, and your code will have tags.

Another way to do this is to manually place the tags into your code by placing the tag [code] above your pasted code and the tag [/code] below your pasted code like so:

Code:

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[code]
  // your code goes here
  // notice how the top and bottom tags are different
[/code]

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Best of luck!