int or float

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6 total messages Started by RaynorPao Thu, 10 Apr 2003 16:08

#661

Author: RaynorPao
Date: Thu, 10 Apr 2003 16:08

6 lines
974 bytes

Hi all:

How can I determine a string is integer or floating?

Thanks.
RaynorPao.

Re: int or float

#662

Author: Kevin Dean
Date: Thu, 10 Apr 2003 18:06

27 lines
1783 bytes

If all you're looking for is a fractional part, then:

boolean isFloatingPoint = s.indexOf('.') != -1;

If you're worried about the size of the number and whether or not it will
fit into an int, that's another issue, but the above code should take care
of most cases.
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"RaynorPao" <RaynorPao.nospam@nospam.pchome.com.tw> wrote in message
news:3e959322@newsgroups.borland.com...
> Hi all:
>
> How can I determine a string is integer or floating?
>
> Thanks.
> RaynorPao.
>
>

Re: int or float

#663

Author: Tor Iver Wilhelmsen (TeamB)
Date: Fri, 11 Apr 2003 06:14

5 lines
1090 bytes

"RaynorPao" <RaynorPao.nospam@nospam.pchome.com.tw> writes:

> How can I determine a string is integer or floating?

Try Integer.parseInt() and catch any NumberFormatException thrown.

Re: int or float

#665

Author: RaynorPao
Date: Fri, 11 Apr 2003 14:06

24 lines
1599 bytes

Hi TorIver & Kevin:

Thanks for your reply.
I found a solution like this as below:

    try {
      Integer.parseInt(str);
      jTextField1.setText("int");
    }
    catch(NumberFormatException e1) {
      try {
        Float.parseFloat(str);
        jTextField1.setText("float");
      }
      catch(NumberFormatException e2) {
        jTextField1.setText("Not int or float");
      }
    }

But, I'm not sure it is OK or not.
Any suggestion, please?

Thanks.
RaynorPao.

Re: int or float

#666

Author: Gillmer J. Derge [TeamB]
Date: Fri, 11 Apr 2003 14:16

18 lines
1826 bytes

"RaynorPao" <RaynorPao.nospam@nospam.pchome.com.tw> wrote in message
news:3e96c819$1@newsgroups.borland.com...
> But, I'm not sure it is OK or not.

Looks OK to me.

You could also consider using java.text.NumberFormat.  The approach would
be similar.  Get a NumberFormat instance to parse integers and another to
parse floats.  Then try each one and catch exceptions to find the invalid
values.

The advantage is that it would be a little more robust to international
variations in number formatting.  For example, "1,234" means something very
different in the United States versus Germany.  In particular, it's a valid
integer in Germany but not in the U.S.

--
Gillmer J. Derge [TeamB]

Re: int or float

#667

Author: RaynorPao
Date: Sat, 12 Apr 2003 17:10

26 lines
1795 bytes

Hi Gillmer:

Thanks for your suggestion.
RaynorPao.

"Gillmer J. Derge [TeamB]" <spam@gillmerderge.com> ���g��l��
news:3e96ce20$1@newsgroups.borland.com...
>
> Looks OK to me.
>
> You could also consider using java.text.NumberFormat.  The approach would
> be similar.  Get a NumberFormat instance to parse integers and another to
> parse floats.  Then try each one and catch exceptions to find the invalid
> values.
>
> The advantage is that it would be a little more robust to international
> variations in number formatting.  For example, "1,234" means something
very
> different in the United States versus Germany.  In particular, it's a
valid
> integer in Germany but not in the U.S.
>
> --
> Gillmer J. Derge [TeamB]
>
>

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