Ternary Operators in C++ (Conditional Assignment) 

Aw everything is awesome

You work at a company that mentors new jr devopers? Sounds like the perfect first job. I think most are terrified of getting that first job and not knowing if they'll be able to produce what is expected.

Edit: Cherno discussed it later in the video but fwiw: I'm essentially a beginner, little bit of experience in python, but anyway: I'm assuming that ternary operators could be a source of MAJOR headaches for Sr. devs and software bugs in general because there's a lot of... density? On one hand you're saving that small amount of runtime, but even if it appears cleaner, to find a bug in the program you're sorting character by character rather than statement by statement. My observation is that in writing code this way: COMMENT everywhere. Otherwise, although I agree with this form in terms of efficiency and I too, think it looks cleaner, this seems like a PERFECT way to create piles and piles of little typo-bugs and misplaced logic. Thoughts?

The charno

Cool tips

Came here to write this, saw you mentioned it. Despite Ygritte's belief, It appears that you know your stuff, Jon Snow!

That's cool

wouldn't this be even more readable? s_speed = s_level > 10 ? 15 : s_level > 5 ? 10 : 5;

Thanks Jon Snow

damn, thats pretty cool , thanks for that.

I know this comment is kinda old but damn that is quite amazing

Isn't that basically some sort of assignment

@@mathematicusterra-4370 Yes, a conditional assignment.

I mean you could just do if (s_Level > 5) SetSpeed(10); else SetSpeed(5);

ternary should be used for one liners, not nested if/elses

@@lycanthoss That's also considered one liner, the man (@MultiPwolf) written. It's just a ... Syntactic Sugar, which is added in it. That's It. By the way, Nice Idea @MultiPwolf!

Isn't assignment are like int a =30?

I also think that makes more sense.

agree

Oh hi Hopson =D Don't you know all of these things yet ? ;D

Nah I do, I am here to help people in the comments as I doubt Cherno has time to help everyone xD

Thats really nice =)

The generated machine code should be exactly the same, it's really just a readability tool. A big use: It allows you to have a sort of "if statement into function argument", so you can decide what to pass into function arguments depending on a condition. Eg: void function (int x) { //blah blah } int main() { bool foo; //Code here which makes `foo` either true or false function(foo ? 10 : 20); //as opposed to: if (foo) { function(10); } else { function(20); } }

Hopson thanks! Nice example!

Hi Hopson! Makes sense.

Not sure about compile time, but it definitely helps in code cleanliness though.

I believe you can achieve the same effect with one line instead something < 5 ? x = 1, y = 2 : (y = 1, x = 2);

@@itsbk6192 Yeah thats what i was thinking too, you can definitely condense the two statements above .

what does this mean ?

@@freddy7304 Isn't it obvious? It's short for: int var; if(cond1) { var = 1; } else if(cond2) { if(cond3) { var = 2; } else { var = 3; } } else { var = 4; }

@@michalsebek2089 so if cond 2, then var = 3?

@@freddy7304 if cond2, then it depends on cond3. If not cond1 and cond2 and cond3, then var = 2. If not cond1 and cond2 and not cond3, then var = 3.

ooh, they're not class members, but the question still applies

that would be useless because there is C++17 already

Actually no that wouldn't be useless, because C++11/14 introduces features that aren't new in C++17...

Yes, we'll get to those eventually. :)

@@TheCherno, can we invoke g++ in a way (with some arguments) so that we get the C++ version(s) that are currently supported ? Also, how do we tell g++ to compile for a specific target version of C++ ?

The answer to the second question is:: g++ -std=c++17 .... Found with:: g++ --help -std= Assume that the input sources are for .

writing the nested one like: s_Speed = (s_Level > 5) ? ((s_Level > 10) ? 15 : 10) : 5;

you dont include the variable name in the expression

This will work: j = (j == 0) ? ++j : --j;

It's not working because you are using post-increment (j++). It will work with pre-increment (++j) as shown below: j = (j == 0) ? ++j : --j; Post-increment will evaluate to j = j++; Pre-increment will evaluate to j = ++j; OR even better, be explicit about the incrementation: j = (j == 0) ? (j + 1) : (j - 1);

blown == 5 true

I think you need another value there, so it would be mind = blown > 1 ? blown > 2 ? blown > 3 ? "totally" : "yes" : "maybe" : "no"; So 4 or greater would give you "totally", 3 would give you "yes", 2 would give you "maybe" and 1 or less would give you "no";

LOLol

I'd write it a bit differently, just for organization sake: mind = blown < 1 ? "no" : blown < 2 ? "maybe" : blown < 3 ? "yes" : "totally";

A tiny bit more optimized, from what I've learned.