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Can anyone tell me what the output of this code is suppose to be?
It is from a test exam
Code:int tal2= 15;
int tal3= 17;
int * p = &tal2;
int * q = &tal3;
cout <<tal2 <<" " << *q <<endl;
(*p)++;
cout <<*p<<" " << tal3 <<endl;
p = p + 1;
cout <<*p<<" " << *q << endl;
Write a program such that you can execute the code and observe its output.
i can't do it from my computer. I just thought that it would be very easy to answer the question.
Thanks!
Why not? There are C++ compilers available for download and use at zero price.Quote:
Originally Posted by lesodk
Yes, it is. Why don't you give it a try? I think that the point is to explain why the output is what it is, rather just saying what is the output.Quote:
Originally Posted by lesodk
EDIT:
Okay, maybe I spoke too soon. Looking more carefully at the code, there is one part is actually results in undefined behaviour.
Well, i would think that p = p + 1makes the pointer invalid, this the output
-----
tal2 17
16 tal3
??? 17
------
here my ?? means, that i don't know what comes there.
That is correct, which is why the latter *p results in undefined behaviour.Quote:
Originally Posted by lesodk