What is possible value for the below snippet in C#

Question

5.00/5 (1 vote)

See more:

What can be the possible output of Console.WriteLine() in below code and in what scenarios?

static void Check(out int a, out int b)
{
a = 2;
b = 3;
Console.WriteLine (a == b);
}

What I have tried:

as I ran it in VS , it simply gave false as the answer.
But this was asked in a puzzle so I think there would be true possible for this but in a specific scenario that I am looking forward to have the explanation for

Posted 1-Aug-16 18:42pm

Learning_to_code

Updated 3-Aug-16 19:20pm

Add a Solution

Comments

[no name] 2-Aug-16 3:19am

Do you have a link to the "puzzle"?

Richard MacCutchan 2-Aug-16 4:47am

The use of the out keyword has no bearing on the answer, which will always be false, since 2 is not equal to 3.

3 solutions

Solution 1

In my opinion t is always false.

In this method you always set a to 2 and b to 3.
After that you compare if they are equal and thanks to the method settings (a=2, b=3), it is always the same.

Create this in C# and test with various scenarios to be sure tho

Posted 1-Aug-16 20:17pm

Evosoul04

Comments

Learning_to_code 2-Aug-16 3:03am

I have tried this in VS and it returned false, That is pretty much clear.
But the beauty/trick lies in the understanding of Out keyword used here.

The question is under which scenario does this snippet have "true" as answer and there should be no change to the snipped put above.

Evosoul04 2-Aug-16 3:11am

The out keyword works like this:

You call the method like this:
int a = 5;
int b = 6;
Check(a,b);
after that method a is 2 and b is 3.

The out keyword simply says that the Value of the Variables are "returned". So the 2 is returned to a and the 3 is returned to b.

The answer to the question is that without a change the Console.Writeline is never true.

For the out keyword try to implement the example above and make a Console.Writeline which shows the values a and b after the Check method.

Learning_to_code 4-Aug-16 1:03am

Returns True when function is called as below -

int a;
Check(out a, out a);

Returns False in all other cases.

Solution 4

I think interviewer was trying to confuse you by using OUT keyword. As in the program it is written a=2 and b=3 so it will be false obviously.

Posted 3-Aug-16 19:20pm

hemantkulshrestha

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Learning_to_code · Accepted Answer · 2016-08-03T19:03:00

Solution 3

Returns True when function is called as below

int a;
Check(out a, out a);

Returns False in all other cases.

This is what I got to know after the answer was revealed. !!!

Posted 3-Aug-16 19:03pm

Learning_to_code