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

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
C) no output
A) 1 2 3
B) 1 2 3 3
D) compilation error
E) program runs forever without output

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

Actual exam question for C++ Institute's CPP exam
Question #: 102
Topic #: 2
[All CPP Questions]

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<

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:

Show Suggested Answer Hide Answer
Suggested Answer: C

by Rosenda at Jan 13, 2025, 07:08 PM

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Lourdes
6 months ago
Sounds fishy, I doubt it runs forever.
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Verona
6 months ago
I think it might just output "1 2 3".
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Terry
7 months ago
Wait, why would it output "3" again?
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Frederica
7 months ago
Totally agree, the loop keeps reading until it fails.
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Margret
7 months ago
It will output "1 2 3 3".
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Benton
7 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.
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Edna
7 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.
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Rex
8 months ago
I'm not entirely sure, but I remember something about the `good()` function. Could it cause an infinite loop?
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Gary
8 months ago
I think the code should output "1 2 3" since it reads the integers from the file correctly.
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Lyla
8 months 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.
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Pearly
8 months 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.
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Thurman
8 months 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.
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Diane
8 months 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.
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Burma
8 months 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.
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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!
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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.
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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!
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Floyd
11 months ago
I think it might be D) compilation error
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Serita
12 months ago
I believe it will be C) no output
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Jerry
12 months ago
I'm going with B) 1 2 3 3
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Vallie
12 months ago
I think it will output A) 1 2 3
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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!
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Fredric
11 months ago
I would go with option A as well, the code seems to be correct.
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Barb
11 months ago
Yes, the code looks fine, so option A is the most likely result.
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Hollis
12 months ago
I agree, option A is the correct output.
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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.
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Ressie
12 months ago
A) 1 2 3
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Tiera
1 year 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.
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Devorah
1 year 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.
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Valentine
1 year 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.
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