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C++ Institute CPP Exam - Topic 5 Question 83 Discussion

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
C) 1 3 5 7 9 ?1 ?3 ?5 ?7 ?9
A) 9 7 5 3 1 ?1 ?3 ?5 ?7 ?9
B) ?1 ?3 ?5 ?7 ?9 9 7 5 3 1
D) 1 3 5 7 9 ?1 ?3 ?5 ?7 ?9
E) ?9 ?7 ?5 ?3 ?1 1 3 5 7 9

C++ Institute CPP Exam - Topic 5 Question 83 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 83
Topic #: 5
[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 t1[]={1,2,3,4,5,6,7,8,9,10};

int t2[]={1,2,3,4,5,6,7,8,9,10};

vector v1(t1, t1+10);

vector v2(t2, t2+10);

vector v3(10);

transform(v1.begin(), v1.end(), v2.rbegin(), v3.begin(), minus());

for_each(v3.rbegin(), v3.rend(), Out(cout));cout<

return 0;

}

Program outputs:

Show Suggested Answer Hide Answer
Suggested Answer: C

by Tammi at Apr 28, 2024, 12:04 AM

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Marjory
10 months ago
Totally agree, it's all about the vector operations!
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Gerald
10 months ago
Wait, are those question marks supposed to mean something?
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Carey
11 months ago
Definitely looks like option A is correct!
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Quentin
11 months ago
I think the output will be reversed.
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Eleonora
11 months ago
The program uses `transform` with `minus()`.
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Nakita
11 months ago
I think the answer might be A, but I’m not confident. The minus operation could lead to some unexpected results with the reverse iterators.
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Laine
12 months ago
I feel like the output should be in descending order since we're using rbegin and rend, but I'm confused about the exact values.
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Lucy
12 months ago
I remember a similar question where we used transform with different operations, but I can't recall if the order of elements matters this much.
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Tanja
12 months ago
I think the transform function is supposed to subtract elements from v2 and v1, but I'm not entirely sure how the reverse iterators affect the output.
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Solange
12 months ago
Okay, let me break this down step-by-step. The `transform()` function is applying the `minus()` operation to the elements of `v1` and the reverse elements of `v2`, storing the results in `v3`. So the first element of `v3` will be `v1[0] - v2[9]`, the second element will be `v1[1] - v2[8]`, and so on. Then, the `for_each()` function is printing the elements of `v3` in reverse order. I think I've got the right approach to solve this.
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Yuette
12 months ago
Hmm, let me think this through. The `transform()` function is subtracting the reversed elements of `v2` from the elements of `v1` and storing the results in `v3`. So the output should be the difference between the corresponding elements of `v1` and the reverse of `v2`. I'll need to work through the logic carefully to determine the exact output.
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Magda
12 months ago
Ah, I see what's going on here. The `transform()` function is applying the `minus()` operation to the elements of `v1` and the reverse elements of `v2`, storing the results in `v3`. Then, the `for_each()` function is printing the elements of `v3` in reverse order. I think I've got this.
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Ariel
12 months ago
Whoa, this code is a bit complex for me. All those templates and algorithms are making my head spin. I'll need to carefully read through the code and the question to understand what's happening.
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Charlene
1 year ago
This looks like a standard C++ problem involving the use of the `transform()` and `for_each()` algorithms. I should be able to work through this step-by-step and arrive at the correct answer.
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Beckie
1 year ago
This looks like a tricky SAX processing question. I'll need to carefully review the SAX processing method and the expected output to determine the correct answer.
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Brynn
1 year ago
I'm a bit confused here. The policies mention dot1p and EXP, but I'm not sure how they're related. I'll need to review my notes on MPLS QoS to figure this out.
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Reita
1 year ago
I'm still trying to figure out how to reverse a vector without getting a headache. This code is like a C++ ninja move - using rbegin() and rend() to access the elements in reverse order. Pretty slick, but I'm just going to guess and say B) 0 1. *shrugs*
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Bettina
1 year ago
The code will most likely display 0 1.
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Bettina
1 year ago
I believe the correct output is 0 1.
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Bettina
1 year ago
I think it will output 0 1.
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Jolanda
1 year ago
Whoa, this is some serious C++ STL magic! I'm still trying to wrap my head around all the template shenanigans and functor business. But I think I got it - the transform() function is subtracting the elements of v2 in reverse order from the corresponding elements in v1, and the for_each() loop is printing the results in reverse order. The correct answer is C) 1 0.
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Jerry
1 year ago
You nailed it! The transform() is subtracting v2 from v1 in reverse, and for_each() is printing the result in reverse. The output should be 1 0.
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Trinidad
1 year ago
Great, so the answer is C) 1 0. Good job figuring it out!
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Jerry
1 year ago
Exactly! The transform() function is doing the subtraction in reverse order, and for_each() is printing the result in reverse. So the correct answer is C) 1 0.
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Quentin
1 year ago
Exactly, it's all about understanding how the transform() and for_each() functions work with vectors.
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Vanna
1 year ago
Yeah, that's correct. So the output should be 1 0.
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Leana
1 year ago
I think you're right, the transform() function is subtracting the elements of v2 from v1 and the for_each() loop is printing the results in reverse order.
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Jerry
1 year ago
Yep, you got it! The transform() function is subtracting the elements of v2 from v1 in reverse order, and for_each() is printing the results in reverse. So the output is 1 0.
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Rene
1 year ago
The code is doing a bit-by-bit subtraction of the elements of the two input vectors, v1 and v2, and storing the results in v3. Since the elements of v2 are being accessed in reverse order, the output will be the differences between the corresponding elements in the two vectors.
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Rodrigo
1 year ago
Why do you think it's C)?
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Katlyn
1 year ago
I disagree, I believe the correct answer is C) 1 0.
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Rodrigo
1 year ago
I think the answer is B) 0 1.
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Alva
1 year ago
Hmm, the transform() function is taking the elements of v1 and v2 in reverse order and subtracting them, storing the results in v3. The for_each() loop is then printing the elements of v3 in reverse order. I think the correct answer is C) 1 0.
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Dianne
1 year ago
This code looks like it's using the transform() and for_each() algorithms to perform some kind of vector manipulation. The output suggests that the transform() is subtracting the elements of the two input vectors, but I'm not sure about the details.
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Mitsue
1 year ago
User 4
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Celestine
1 year ago
User 3
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Kanisha
1 year ago
User 2
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Kenny
1 year ago
User 1
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