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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Reita

1 months 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

8 days ago

The code will most likely display 0 1.

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Bettina

24 days ago

I believe the correct output is 0 1.

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Bettina

1 months ago

I think it will output 0 1.

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Jolanda

2 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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Jerry

11 days 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

12 days ago

Great, so the answer is C) 1 0. Good job figuring it out!

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Jerry

12 days 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

13 days ago

Exactly, it's all about understanding how the transform() and for_each() functions work with vectors.

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Vanna

28 days ago

Yeah, that's correct. So the output should be 1 0.

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Leana

1 months 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 months 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

2 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

1 months ago

User 4

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Celestine

1 months ago

User 3

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Kanisha

2 months ago

User 2

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Kenny

2 months ago

User 1

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