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

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:

A9 7 5 3 1 ?1 ?3 ?5 ?7 ?9

B?1 ?3 ?5 ?7 ?9 9 7 5 3 1

C1 3 5 7 9 ?1 ?3 ?5 ?7 ?9

D1 3 5 7 9 ?1 ?3 ?5 ?7 ?9

E?9 ?7 ?5 ?3 ?1 1 3 5 7 9

Show Suggested Answer

Suggested Answer: C

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

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Jolanda

21 hours 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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Rene

5 days 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

8 days ago

Why do you think it's C)?

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Katlyn

10 days ago

I disagree, I believe the correct answer is C) 1 0.

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Rodrigo

15 days ago

I think the answer is B) 0 1.

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Alva

17 days 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

18 days 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.

upvoted 0 times

Kenny

4 days ago

User 1

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