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

Discuss C++ Institute CPP Exam Topic 9 Question 91

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

#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:

A3 2 4 1 5 6 10 8 7 9

B4 3 5 2 6 7 11 9 8 10

C9 7 8 10 6 5 1 4 2 3

D10 8 9 11 7 6 2 5 3 4

Ecompilation error

Suggested Answer: B

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36 comments · newest first

Stefany 11 months ago

I'm surprised it works with reverse iterators like that!

Georgiana 11 months ago

Definitely not a compilation error, so E is wrong.

Linn 11 months ago

Wait, does it really use bind1st? That's kinda old school!

Dahlia 11 months ago

I think the output is actually option B.

Adell 11 months ago

The code compiles fine!

Lashaun 12 months ago

I’m leaning towards option B, but I’m not entirely confident about how the `plus()` works with `bind1st`.

Joanna 12 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.

Gracie 12 months ago

I remember something similar from practice where we used `for_each`, but I can't recall how `bind1st` affects the values.

Tamala 1 year ago

I think the code should compile fine since it uses standard libraries, but I'm not sure about the output.

Billy 1 year 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.

Laquanda 1 year 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.

Corrinne 1 year 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.

Barney 1 year 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.

Elenor 1 year 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.

Page 1 year 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.

Anglea 1 year 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.

Daniela 1 year 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?

Avery 1 year 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.

Rikki 1 year ago

This code is like a game of 'Guess the Output' - you never know what you're going to get!

Daren 1 year ago

↳ replying to Rikki

C) 1 0

Larae 1 year ago

↳ replying to Rikki

B) 0 1

Tamekia 1 year ago

↳ replying to Rikki

A) 0 0

Mozell 1 year 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.

Ocie 1 year ago

↳ replying to Mozell

I agree, the code adds 1 to each element and then prints 1 for each element in reverse.

Ocie 1 year ago

↳ replying to Mozell

I think it will output 1 1 as well.

Rebecka 1 year 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.

Noble 1 year ago

↳ replying to Rebecka

D) 1 1

Antione 1 year ago

↳ replying to Rebecka

C) 1 0

Trina 1 year ago

↳ replying to Rebecka

B) 0 1

Jose 1 year ago

↳ replying to Rebecka

A) 0 0

Dulce 1 year 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.

Annmarie 1 year ago

↳ replying to Dulce

User2

Lura 1 year ago

↳ replying to Dulce

User1

Marti 2 years 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.

Ashlyn 2 years ago

I agree with Franklyn, the bind1st function is not correctly used, so the output should be 0 0.

Franklyn 2 years ago

I think the program will output 0 0 because the bind1st function is not correctly used.

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