Category: Career Guidance

30 Sep 2014 15:27

Joined:	11/09/2014
Level:	Bronze
Points:	88

Points:	2

Difference between ++a and a++ in c#

Hi all,

Today I met a interview question

what is the result for the following code in c# ?

int a = 29;
a--;
a -= ++a;

actually I checked this code in a c# function it return -1.

So please tell me what is the logic in this code....

Thanks in advance

#752380

30 Sep 2014 22:23

Joined:	28/04/2006
Level:	Gold
Points:	29773

Points:	4

Hai Ramesh Kumar,
This is correct as per the C# coding.itmight behe differently when you use C language.
As per the C# language:


int a = 29;
a--;
a -= ++a;
Console.WriteLine(a.ToString());

Line #1: Setting the value 29 to the integer variable so value of a will be 29.
Line #2: a-- will have now 28(in C#) with the decrements of 1.
Line #3:it is equivalent to
a = a - (++a);
So again a will be increment to 29 and then 28-29 will return -1. Which is assigned to a again.
Line #4: Printing the value of a.
Hope it will be helpful to you.

Regards,
Pawan Awasthi(DNS MVM)
+91 8123489140 (whatsApp), +60 14365 1476(Malaysia)
pawansoftit@gmail.com

#752382

30 Sep 2014 22:49

Joined:	18/07/2014
Level:	Gold
Points:	1837

Points:	2

Hi,

There is very basic difference in both.
a++ is used to get value of a variable and than it increments value of a.
++a is used to increment value and than get value of a.
I hope you got my point,
If still you have an issue ,than i'll get back to you.

Regards,
Nirav Prabtani (Senior Web Developer)
Email : niravjprabtani@gmail.com
blog : niravprabtani.blogspot.in

#752399

01 Oct 2014 00:04

Joined:	12/11/2009
Level:	Gold
Points:	43848

Points:	2

Hi,

In simple explanation

a++ is called as postfix and ++a is called as prefix

When you say a++ compiler adds 1 to a but returns the old value.

When you say ++a compiler adds 1 to a and returns the new value

Regards,
Asheej T K

#752444

01 Oct 2014 09:35

Joined:	11/09/2014
Level:	Bronze
Points:	88

Points:	1

Thanks All ..I got clear idea...

Difference between ++a and a++ in c#

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