Discuss C++ Institute CPP Exam Topic 6 Question 104

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

#include

int main ()

{

int t[]={1,2,3,4,5};

std::vectorv1(t,t+5);

std::vectorv2(v1);

v1.resize(10);

v2.reserve(10);

std::vector::iterator i = v1.begin();int ii = 0;

while (i != v1.end()) { std::cout<

i = v2.begin();ii=0;

while (i != v2.end()) { std::cout<

return 0;

}

Aprogram outputs 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Bcompilation error

Cprogram outputs 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5

Dprogram outputs 1 2 3 4 5 0 0 0 0 0 1 2 3 4 5 0 0 0 0 0

Suggested Answer: E

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36 comments · newest first

Altha 11 months ago

I agree, D seems like the most likely output here.

Merilyn 11 months ago

Wait, why would it output so many 1s? That seems off.

Tenesha 11 months ago

Definitely not a compilation error.

Altha 11 months ago

I think the output will be a mix of 1s and 0s.

Curtis 11 months ago

Looks like it should compile fine.

Lachelle 12 months ago

I feel like the program will just print a bunch of ones because of how the iterator is being used, but I could be wrong.

Ria 12 months ago

The output might be a mix of the original array and zeros, but I can't recall exactly how the resizing affects the output.

Brett 12 months ago

I remember something similar where using an uninitialized index caused issues. I wonder if that's what's happening here with "ii??".

Elvis 1 year ago

I think the code should compile fine since it uses standard vector operations, but I'm not sure about the iterator part.

Vivan 1 year ago

I've seen similar questions before, so I think I have a good handle on this. Let me walk through the code and the expected behavior of the vector operations.

Jarod 1 year ago

I'm not sure about this one. The output doesn't seem straightforward, and I'll need to think it through carefully to determine the correct answer.

Salena 1 year ago

Okay, I think I've got this. The key is understanding the difference between the capacity and size of the vectors. Let me work through it step-by-step.

Lisbeth 1 year ago

Hmm, I'm a bit confused about the use of `reserve()` and `resize()` here. I'll need to review how those methods work to figure out the expected output.

Ardella 1 year ago

This looks like a tricky one. I'll need to carefully step through the code to understand what's happening with the vectors.

Jose 1 year ago

Wait, is that a typo in the loop? I think the '??' is supposed to be '++'. Gotta pay attention to the small details!

Artie 1 year ago

↳ replying to Jose

B) compilation error

Rosann 1 year ago

↳ replying to Jose

B) compilation error

Tamesha 1 year ago

↳ replying to Jose

B) compilation error

Alecia 1 year ago

I'm picturing the output being a weird mix of 1s and the original elements. This should be a fun one to work through.

Christoper 1 year ago

↳ replying to Alecia

C) program outputs 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5

Christoper 1 year ago

↳ replying to Alecia

B) compilation error

Christoper 1 year ago

↳ replying to Alecia

A) program outputs 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Nichelle 1 year ago

Haha, I can already see the compiler throwing a fit at this code. Time to brush up on my C++ vector knowledge!

Rosio 1 year ago

↳ replying to Nichelle

I believe the program will output 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5.

Rosio 1 year ago

↳ replying to Nichelle

Yeah, the code looks like it might have some issues with iterators.

Rosio 1 year ago

↳ replying to Nichelle

I think it will output a compilation error.

Trina 2 years ago

Ah, the classic vector resizing and copying conundrum. I bet the answer has something to do with the difference between resize() and reserve().

Roosevelt 1 year ago

↳ replying to Trina

B) compilation error

Roosevelt 1 year ago

↳ replying to Trina

C) program outputs 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5

Micaela 2 years ago

This looks like a tricky one! I'm going to have to think through the memory management implications carefully.

Howard 1 year ago

↳ replying to Micaela

I think it will result in a compilation error

Howard 1 year ago

↳ replying to Micaela

No, it will output 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5

Howard 1 year ago

↳ replying to Micaela

It will output 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Beth 2 years ago

I'm not sure, but I think the answer might be C) program outputs 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5 because of the way the vectors are being manipulated.

Andrew 2 years ago

I agree with Goldie, the code looks like it will not compile correctly.

Goldie 2 years ago

I think the answer is B) compilation error because there seems to be an issue with the code.

C++ Institute CPP Exam - Topic 6 Question 104 Discussion