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Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()?

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On Wed, 06 Jul 2011 11:54:47 -0700, markspace <-@.> wrote:

>On 7/6/2011 11:11 AM, Thee Chicago Wolf [MVP] wrote:
>
>> String str = "30420729485092847590";
>> int[] x = new int[20];	
>>
>> 	for (int i = 0; i<  str.length(); i++)
>> 	{
>> 	String index = str.charAt(i)+"";
>> 	x[i] = Integer.parseInt(index);
>> 	}
>
>
>The problem here is that you've switched requirements again.  Your first 
>problems statement was:
>
> > find the largest product of a group of 5 integers.
>
>And those aren't integers, they're digits.  So it all depends still on 
>what you are trying to do.  If you just want the digits:
>
>String str = "30420729485092847590";
>int[] x = new int[ str.length ];  // *cough*
>
>	for (int i = 0; i < str.length(); i++)
>	{
>	  x[i] = str.charAt(i) - '0';
>	}
>
>No need to parse a single digit.

Well, I originally used int[] x = new int[str.length]; but it gives a
compile error. (str.length()] does work though. Guessing because it's
of type String.

In any case, someone told me that the reason that String index =
str.charAt(i) won't work is because it ought to be
String.valueOf(str.charAt(i)). That did work as it should and didn't
requires adding +"" after (i).

So as you've done above, it works without needing the Integer.parseInt
stuff that I used. Thanks for that tip! But does the - '0' portion of
x[i] = str.charAt(i) - '0'; just tell it to convert to its ASCII
value? We dicussed this here and were like WTF is this? What exactly
is that portion doing? Thanks for walking me through it.

- Thee Chicago Wolf [MVP]

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Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-01 12:53 -0500
  Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Jeff Higgins <jeff@invalid.invalid> - 2011-07-01 17:55 -0400
  Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-01 18:19 -0700
    Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-05 10:26 -0500
      Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-05 13:39 -0400
        Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-05 13:57 -0500
          Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-05 13:01 -0700
            Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-05 15:47 -0500
              Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-05 14:57 -0700
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-06 13:11 -0500
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-06 11:54 -0700
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-06 16:58 -0500
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-06 15:36 -0700
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Patricia Shanahan <pats@acm.org> - 2011-07-06 16:53 -0700
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? markspace <-@.> - 2011-07-06 18:07 -0700
              Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-07-06 09:57 +0100
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-06 13:13 -0500
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-07-07 09:43 +0100
              Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-07-06 11:15 +0200
                Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-06 13:14 -0500
          Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-05 16:27 -0400
            Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-07-06 11:22 +0200
              Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-06 07:33 -0400
  Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-07-01 23:06 -0400
    Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Patricia Shanahan <pats@acm.org> - 2011-07-01 20:28 -0700
    Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-05 10:27 -0500
  Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? Roedy Green <see_website@mindprod.com.invalid> - 2011-07-04 08:59 -0700
    Re: Convert a String to Int: can I use toInt() instead of Integer.parseInt()? "Thee Chicago Wolf [MVP]" <.@.> - 2011-07-05 10:30 -0500

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