How Can I Check Whether The Last Digit Is Integer Or Not

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how can i check weather the last position of a string is integer or not??

For Example:-

String str = "Hello123";

Now how can i check the last digit "3" is integer or string??

please help

Posted 1-Nov-15 19:25pm

Palash Sachan

Updated 1-Nov-15 19:33pm

v2

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3 solutions

Solution 2

Try this-

C#

String str = "Hello123";
str = str.Substring(str.Length - 1);
int temp=0;
if(int.TryParse(str,out temp))
   Console.WriteLine("Integer");
else
   Console.WriteLine("Not Integer");

Hope, it helps :)

Posted 1-Nov-15 19:38pm

Suvendu Shekhar Giri

Comments

Palash Sachan 2-Nov-15 1:54am

Nice..this also working very fine..thanks Sir

Solution 3

You can use Char.IsDigitMethod() to test

C#

String str = "pankaj3";
bool b = Char.IsDigit(str,str.Length - 1);

Posted 1-Nov-15 19:44pm

PANKAJMAURYA

Comments

Palash Sachan 2-Nov-15 1:55am

Working fine..thanks sir for help

George Jonsson 2-Nov-15 20:45pm

And how is your solution different from mine?

[no name] 2-Nov-15 23:37pm

I did not saw your solution. You edited the solution. Is your solution is same as 1st version?

[no name] 2-Nov-15 23:42pm

In previous version you did not mention the Char class.

Palash Sachan 2-Nov-15 22:23pm

nothing different..its the same as yours sir :)

[no name] 2-Nov-15 23:53pm

He edited the solution 3 hour before and In previous version He did not mention the Char class.

George Jonsson 3-Nov-15 0:00am

I did mention the Char class in the link, but made a typo in the code sample.
I corrected that part.
So yes, your solution was a little bit different.

Palash Sachan 3-Nov-15 0:24am

why the hell you both are fighting..i got the solution of my problem dear..thanks to all for reply :)

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George Jonsson · Accepted Answer · 2015-11-01T19:34:00

Solution 1

If your only concern is to check if the last character is a digit or alpha, you can use the method Char.IsDigit[^]

Like

C#

bool isDigit = Char.IsDigit(str, str.Length-1);

Posted 1-Nov-15 19:34pm

George Jonsson

Updated 2-Nov-15 14:15pm

v2

Comments

Suvendu Shekhar Giri 2-Nov-15 1:43am

5Ed.
It is better solution than mine.
My solution was smething like-
bool isDigit = int.TryParse(str.Substring(str.Length - 1));

George Jonsson 2-Nov-15 1:53am

Your solution might be better if the OP wants to do something with the integer.
In your case the integer is already available, my solution only provides the test.
Thanks for the upvote.

Palash Sachan 2-Nov-15 1:53am

working perfectly correct..Thanks you sir

George Jonsson 2-Nov-15 1:55am

You are welcome.