I've a String with Length = 100;
I need to center the text "Hello", in that string using whitespaces.
How can i do ?
thanks.
3
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Actually i found what i want (but in java) stackoverflow.com/questions/8154366/…Yoann. B– Yoann. B2011-11-20 09:42:37 +00:00Commented Nov 20, 2011 at 9:42
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take a look at csharp-examples.net/align-string-with-spacesGlory Raj– Glory Raj2011-11-20 09:44:15 +00:00Commented Nov 20, 2011 at 9:44
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@Yoann.B take a look at here stackoverflow.com/questions/644017/… i hope it will helps you..Glory Raj– Glory Raj2011-11-20 09:57:30 +00:00Commented Nov 20, 2011 at 9:57
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4 Answers
You can use the string padding methods and a little match to calcualte the center position:
var stringToCenter = "hello";
var totalLength = 100;
var centeredString =
stringToCenter.PadLeft(((totalLength - stringToCenter.Length) / 2)
+ stringToCenter.Length)
.PadRight(totalLength);
And you can move this logic into an extension method:
public static class StringExtensions{
public static string CenterString(this string stringToCenter, int totalLength)
{
return stringToCenter.PadLeft(((totalLength - stringToCenter.Length) / 2)
+ stringToCenter.Length)
.PadRight(totalLength);
}
}
And you can use it like
var centeredString = "hello".CenterString(100);
Demo .NETFiddle.
6 Comments
Tim
What happens if ((totalLength - stringToCenter.Length) / 2) = 34.33 or some other non-integer value?
nemesv
It won't happen (totalLength - stringToCenter.Length) / 2 will do integer division so the result will be always integer.
Tim
I didn't know that (just tried it out myself). Nice to know. Thanks.
sgmoore
Downvoted as this answer actually gives the wrong result. It should insert 47 spaces at the start, but it only inserts 42. For the correct result see @Theophilus's answer
nemesv
@sgmoore thanks for the comment, I fixed now my answer so it contains the correct calculation and also extended and formatted it when I was there. Sadly Theophilus posted his valuable comment as an answer so a was not notified about my error until now.
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I would have added this as a comment to @nemesv's answer, but my lack of reputation on Stack Overflow prevents it.
The code in that answer causes more padding to be added on the right than the left. For example, in the code for that answer, the "h" in hello appears at the 43rd position instead of the 48th.
This revised code balances the padding.
var stringToCenter = "hello";
var stringToCenterLength = stringToCenter.Length;
var totalLength = 100;
var centeredString = stringToCenter.PadLeft(((totalLength - stringToCenterLength) / 2) + stringToCenterLength).PadRight(totalLength);
Comments
You can calculate string lenght and then apply appropriate padding by:
"".PadLeft() or "".PadRight()
Comments
I've expanded @nemesv's answer to contain an overload accepting a padding character so you can get something like:
################################# Hello World! #################################
Code:
using System;
public class Program
{
public void Main()
{
Console.WriteLine(" Hello World! ".CenterString(80, '#'));
}
}
public static class StringExtensions
{
public static string CenterString(this string stringToCenter, int totalLength)
{
return stringToCenter.PadLeft(
((totalLength - stringToCenter.Length) / 2)
+ stringToCenter.Length).PadRight(totalLength);
}
public static string CenterString(this string stringToCenter,
int totalLength,
char paddingCharacter)
{
return stringToCenter.PadLeft(
((totalLength - stringToCenter.Length) / 2) + stringToCenter.Length,
paddingCharacter).PadRight(totalLength, paddingCharacter);
}
}
Example: .NETFiddle
