What is the output of this code and why??

Question

int i,a[10];
For(i=4;i<9;i+=3)
{i=i-2;}
Cout<<a[8];

Answer 1

After correcting and completing, this code will produce different output in different runs. It's output is undefined. Why? It's simple, you are printing the value a[8] but you didn't assign anything to it. So garbage value will be printed.

In other words, it'll print based on the random bits in that memory location because you didn't modify it to have your own value

But if the variable is global variable, then it'll print 0. The reason for it is below, tnx to @Mehran

https://stackoverflow.com/questions/14049777/why-are-global-variables-always-initialized-to-0-but-not-local-variables

Answer 2

Nariman Tajari well, I would say it'd be better to choose the right option as "undefined" or something similar to it

Answer 3

Nariman Tajari well, I run it on Sololearn and got some negative number with really high magnitude

Answer 4

If "a" is defined in global scope, its value isn't garbage. all its indices are 0.
Are you sure it was inside the function?

Answer 5

Mehran how? Do global variables get auto initialization in C?

Answer 6

Rishi
https://stackoverflow.com/questions/14049777/why-are-global-variables-always-initialized-to-0-but-not-local-variables

Answer 7

Mehran ooh yeah tnx very much =)

Answer 8

Yes rishi well answered but i donno why sololearn offers "0"as answer.

Answer 9

Nariman Tajari

I think your shared code is incomplete.

Answer 10

Nariman Tajari

You will get garbage value because i never would be 8

Because after i = 6, i would be 9 so "for" loop will not execute because 9 < 9 is false

Answer 11

A͢J - S͟o͟l͟o͟H͟e͟l͟p͟e͟r͟ yes true but i donno why sololearn offers "0" as a output.
I guess in some quizes question's last answer designed like this just for fun.

Answer 12

Nariman Tajari

Not for fun because garbage value may change everytime so they just put 0 in quizzes which makes more sense instead of some garbage value.

Answer 13

Here, this is your complete code, run it and see for yourself =)
https://code.sololearn.com/c9a8p94VyowS/?ref=app

Answer 14

Yes i know rishi but A͢J - S͟o͟l͟o͟H͟e͟l͟p͟e͟r͟ said the sololearn did it as it seems to be more senseful.