How to check a string

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How to check a string if this string is composite of number?

[Rakesh Rajan]

Hi ad,

What exactly did you mean by "composite of number"?

Could you please describe in more detail what you are trying to accomplish?

--
HTH,
Rakesh Rajan
MVP, MCSD
http://www.msmvps.com/rakeshrajan/

"ad" wrote:

How to check a string if this string is composite of number?

[ad]

It must be composite of char 0..9
Thank

"Rakesh Rajan" <rakeshrajan {at} mvps {dot} org> ¼¶¼g©ó¶l¥ó·s»D:2C********************************* *@microsoft.com...

Hi ad,

What exactly did you mean by "composite of number"?

Could you please describe in more detail what you are trying to
accomplish?

--
HTH,
Rakesh Rajan
MVP, MCSD
http://www.msmvps.com/rakeshrajan/

"ad" wrote:

How to check a string if this string is composite of number?

[Octavio Hernandez]

Hi,

You can use:

bool IsInteger(string s)
{
try
{
int n = int.Parse(s);
return true;
}
catch
{
return false;
}

This will accept a '+' or '-' sign in front of a number. If you don't want
that, you could write your own function:

bool IsInteger(string s)
{
for (int i = 0; i < s.Length; i++)
if (s[i] < '0' || s[i] > '9')
return false;
return true;
}

Check against a regular expression could be another solution.

Regards - Octavio

"ad" <[e-mail]> escribió en el mensaje
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How to check a string if this string is composite of number?

[Oliver Sturm]

Octavio Hernandez wrote:

Check against a regular expression could be another solution.

Yep, and much easier:

if (Regex.IsMatch(myString, "\d+"))
// myString contains at least one character 0-9
Oliver Sturm
--
omnibus ex nihilo ducendis sufficit unum
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[Octavio Hernandez]

You're absolutely right, Oliver!

Regards - Octavio

"Oliver Sturm" <ol****@sturmnet.org> escribió en el mensaje
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Octavio Hernandez wrote:

Check against a regular expression could be another solution.

Yep, and much easier:

if (Regex.IsMatch(myString, "\d+"))
// myString contains at least one character 0-9
Oliver Sturm
--
omnibus ex nihilo ducendis sufficit unum
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[Rakesh Rajan]

That was real clever Oliver :)

BTW, I think the regex should be "^\d+$"

--
HTH,
Rakesh Rajan
MVP, MCSD
http://www.msmvps.com/rakeshrajan/

"Oliver Sturm" wrote:

Octavio Hernandez wrote:

Check against a regular expression could be another solution.

Yep, and much easier:

if (Regex.IsMatch(myString, "\d+"))
// myString contains at least one character 0-9
Oliver Sturm
--
omnibus ex nihilo ducendis sufficit unum
Spaces inserted to prevent google email destruction:
MSN oliver @ sturmnet.org Jabber sturm @ amessage.de
ICQ 27142619 http://www.sturmnet.org/blog