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C++ Institute Exam CPP 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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Reita
25 days 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
9 days ago
I believe the correct output is 0 1.
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Bettina
16 days ago
I think it will output 0 1.
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Jolanda
1 months 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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Vanna
13 days ago
Yeah, that's correct. So the output should be 1 0.
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Leana
15 days 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
22 days 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 months 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
2 months ago
Why do you think it's C)?
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Katlyn
2 months ago
I disagree, I believe the correct answer is C) 1 0.
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Rodrigo
2 months ago
I think the answer is B) 0 1.
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Alva
2 months 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
2 months 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
24 days ago
User 4
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Celestine
25 days ago
User 3
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Kanisha
1 months ago
User 2
upvoted 0 times
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Kenny
1 months ago
User 1
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