This is the basic program of C Language. What will be the output?

How about compile it, run it and see it for yourself?

No.

Bullshit interview question.

@irene I don't think that's undefined? Terrible code yea, but I'm pretty sure that's defined behavior

Dumb question because you would never write code that looks like this unless you're an absolute fucking idiot.

Edit: Sorry not sorry if I offended someone.

Looks like from an interview all right, or some such. Anyway… output is:

10 11 20 10

Variable i gets initialized to 9, then increased, so it prints 10.

New scope is declared with a variable i that shadows the i from the outer scope; the inner i is set to 11, so it prints 11.

Variable i is decremented, making it 10, then added to itself, making it 20, so it prints 20.

Inner scope is closed, next access to i is the original outer one, so it prints 10.

He/She/It who/which understands scopes and basic C operators should get this right without even having to type, compile, and run this program.

I am confused. I thought I would learn some new WTF thing about programming but I was wrong.

I failed ya all guys..

I failed to understand the point...
¯\_(ツ)_/¯

@SomeNone still a bullshit interview question.

I support that line 14 is undefined behaviour because there's no sequence point between two accesses to the same scalar that is subject to a side effect.

@Fast-Nop Maybe, maybe not, I don't have time to read the specs right now… and now that I think about it, it is not quite clear whether the final addition is to the value of i before or after evaluating the right-hand side. If the specs don't have an aswer (or explicitly state that the behaviour is undefined), then it is indeed undefined.

Well, this one is a good c# code. And actually VERY easy to use, even if definition is scary af

@irene That's why, at least in C++, it's not uncommon in company coding standards to forbid any use of templates except the ones the STL already provides.

@irene That is what I thought at first.
But usage is SOOOO simple. Basically this allows me to simplify Entity framework code soso much !

@irene True. And I try to avoid it as much as possible. But this one, saves around 5000 lines of code (Whole app combined)

Why the fuck did you tag a question about C with Python and C++

Not sure if it's a quiz or your homework 🙄