What will happen when you attempt to compile and run the code below, assuming that file test.in contains the following sequence: 1 2 3?#include #include #include #include #include using namespace std;templatestruct Out {ostream & out;Out(ostream & o): out(o){}void operator() (const T & val ) {out

E) program runs forever without output

Discuss C++ Institute CPP Exam Topic 2 Question 102

What will happen when you attempt to compile and run the code below, assuming that file test.in contains the following sequence: 1 2 3?

#include

using namespace std;

templatestruct Out {

ostream & out;

Out(ostream & o): out(o){}

void operator() (const T & val ) {out<

int main () {

ifstream f("test.in");

list l;

for( ; f.good() ; ) {

int i;

f>>i;

l.push_back(i);

}

f.close();

for_each(l.begin(), l.end(), Out(cout));

return 0;

}

Program will output:

Suggested Answer: C

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30 comments · newest first

Lourdes 11 months ago

Sounds fishy, I doubt it runs forever.

Verona 11 months ago

I think it might just output "1 2 3".

Terry 11 months ago

Wait, why would it output "3" again?

Frederica 11 months ago

Totally agree, the loop keeps reading until it fails.

Margret 11 months ago

It will output "1 2 3 3".

Benton 12 months ago

I don't recall seeing any compilation errors, so I doubt it's option D. But I'm confused about the loop condition.

Edna 12 months ago

I practiced a similar question, and I feel like it might output "1 2 3 3" if it reads the last integer again somehow.

Rex 12 months ago

I'm not entirely sure, but I remember something about the `good()` function. Could it cause an infinite loop?

Gary 1 year ago

I think the code should output "1 2 3" since it reads the integers from the file correctly.

Lyla 1 year ago

Hmm, I'm not sure about this one. The code looks a bit complex, and I'm worried there might be some edge cases I'm missing. I'll need to really think it through carefully.

Pearly 1 year ago

I think I've got it! The key is that the file reading loop continues until the `good()` function returns false, which happens when we reach the end of the file. So the output should be exactly what's in the file.

Thurman 1 year ago

Wait, I'm a bit confused. Why are we using a template class for the output? Isn't that overkill for this simple task? I'll need to double-check the details.

Diane 1 year ago

Okay, let me think this through step-by-step. We're reading in a file, storing the numbers in a list, and then printing them out. I'm pretty confident I can figure this out.

Burma 1 year ago

Hmm, this looks like a tricky one. I'll need to carefully read through the code and the question to make sure I understand what's going on.

Dorethea 1 year ago

This question is making my head spin! I feel like I'm being tested on my ability to read minds, not C++ code. Maybe the real answer is that the program will summon a horde of angry cats who will steal all the test papers. Now that would be a real surprise!

Amie 1 year ago

Hmm, I'm not too sure about this one. The code looks a bit complex, and I can see a couple of potential issues. I'm going to play it safe and go with D, just in case there's a compilation error lurking somewhere.

Tashia 1 year ago

I'm going with B. The code looks a bit weird, and I think it might read the last integer '3' twice. You never know with these tricky questions!

Floyd 1 year ago

↳ replying to Tashia

I think it might be D) compilation error

Serita 1 year ago

↳ replying to Tashia

I believe it will be C) no output

Jerry 1 year ago

↳ replying to Tashia

I'm going with B) 1 2 3 3

Vallie 1 year ago

↳ replying to Tashia

I think it will output A) 1 2 3

Hannah 1 year ago

Definitely option A. The code is straightforward and should work as expected. I'm surprised the other options are even there. This is an easy one!

Fredric 1 year ago

↳ replying to Hannah

I would go with option A as well, the code seems to be correct.

Barb 1 year ago

↳ replying to Hannah

Yes, the code looks fine, so option A is the most likely result.

Hollis 1 year ago

↳ replying to Hannah

I agree, option A is the correct output.

Ashlyn 1 year ago

The program will output '1 2 3', as the code reads the integers from the input file and stores them in a list, then uses the for_each algorithm to print each element of the list to the console.

Ressie 1 year ago

↳ replying to Ashlyn

A) 1 2 3

Tiera 2 years ago

I'm not sure, but I think the program will output B) 1 2 3 3 because the last integer will be printed twice.

Devorah 2 years ago

I agree with Valentine. The program will output A) 1 2 3 because the for_each function will print the integers in the list.

Valentine 2 years ago

I think the program will output A) 1 2 3 because it reads the integers from the file and pushes them into the list.

C++ Institute CPP Exam - Topic 2 Question 102 Discussion