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C++ Institute CPP Exam - Topic 9 Question 91 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 91
Topic #: 9
[All CPP Questions]

What happens when you attempt to compile and run the following code?

#include

#include

#include

#include

using namespace std;

templatestruct Out {

ostream & out;

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

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

int main() {

int t[]={3,2,4,1,5,6,10,8,7,9};

vector v1(t, t+10);

for_each(v1.begin(), v1.end(), bind1st(plus(), 1));

for_each(v1.rbegin(), v1.rend(), Out(cout));cout<

return 0;

}

Program outputs:

Show Suggested Answer Hide Answer
Suggested Answer: B

by Casandra at Aug 03, 2024, 06:08 PM

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Stefany
3 months ago
I'm surprised it works with reverse iterators like that!
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Georgiana
4 months ago
Definitely not a compilation error, so E is wrong.
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Linn
4 months ago
Wait, does it really use bind1st? That's kinda old school!
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Dahlia
4 months ago
I think the output is actually option B.
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Adell
4 months ago
The code compiles fine!
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Lashaun
4 months ago
I’m leaning towards option B, but I’m not entirely confident about how the `plus()` works with `bind1st`.
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Joanna
5 months ago
I feel like the output will be the original array reversed, but I might be mixing it up with another example we did.
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Gracie
5 months ago
I remember something similar from practice where we used `for_each`, but I can't recall how `bind1st` affects the values.
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Tamala
5 months ago
I think the code should compile fine since it uses standard libraries, but I'm not sure about the output.
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Billy
5 months ago
I'm a bit confused by the use of `bind1st` and the custom `Out` functor. I'll need to review those concepts before I can determine the correct output.
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Laquanda
5 months ago
Okay, let me think this through. The code creates a vector `v1` and then modifies each element by adding 1 using `for_each` and `bind1st`. Then it prints the elements in reverse order using another `for_each` and a custom functor `Out`. I think the answer is B, but I'll double-check my work.
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Corrinne
5 months ago
Hmm, the code uses some advanced C++ features like templates, functors, and the `for_each` algorithm. I'll need to make sure I understand how those work before I can confidently answer this.
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Barney
5 months ago
This looks like a tricky C++ question. I'll need to carefully read through the code and understand what's happening step-by-step.
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Elenor
5 months ago
This looks straightforward. The code increments each element of the vector by 1, then prints the elements in reverse order. The answer is clearly B.
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Page
5 months ago
Hmm, I'm not entirely sure about this one. I know amplitude and frequency are important, but I'm drawing a blank on the other critical factor. Let me think this through carefully.
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Anglea
5 months ago
Okay, let me think this through step-by-step. We need to create the ZFS file system with the specified options, so I'll focus on getting the command structure correct.
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Daniela
5 months ago
If I recall correctly, last week we practiced a question about sources for crime statistics, and the FBI was the answer. But for homicide and suicide, maybe it's different?
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Avery
10 months ago
The correct answer is B) 0 1. The for_each loop adds 1 to each element, so the vector becomes 4 3 5 2 6 1 11 9 8 10. Then the reversed for_each loop prints these elements, but the last element is printed as 0 because it's out of range.
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Rikki
10 months ago
This code is like a game of 'Guess the Output' - you never know what you're going to get!
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Daren
9 months ago
C) 1 0
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Larae
9 months ago
B) 0 1
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Tamekia
9 months ago
A) 0 0
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Mozell
10 months ago
Hmm, I'm not sure. The code looks a bit complex, but I'd guess the output is 1 1, since the for_each loop is adding 1 to each element and then the reversed for_each is printing 1 for each element.
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Ocie
9 months ago
I agree, the code adds 1 to each element and then prints 1 for each element in reverse.
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Ocie
9 months ago
I think it will output 1 1 as well.
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Rebecka
11 months ago
I think the output will be 4 3 5 2 6 1 10 8 7 9. The for_each function is adding 1 to each element, and then the reversed for_each is printing the elements.
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Noble
9 months ago
D) 1 1
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Antione
9 months ago
C) 1 0
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Trina
9 months ago
B) 0 1
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Jose
10 months ago
A) 0 0
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Dulce
11 months ago
The code seems to be adding 1 to each element of the vector and then printing them in reverse order. So the output should be 10 9 8 7 6 5 4 3 2 1.
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Annmarie
10 months ago
User2
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Lura
10 months ago
User1
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Marti
11 months ago
I'm not sure about the output, but I think it might be 0 1 because of the way the bind1st function is being called.
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Ashlyn
11 months ago
I agree with Franklyn, the bind1st function is not correctly used, so the output should be 0 0.
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Franklyn
11 months ago
I think the program will output 0 0 because the bind1st function is not correctly used.
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