C++ Institute Exam CPP Topic 2 Question 99 Discussion

Actual exam question for C++ Institute's CPP exam

Question #: 99
Topic #: 2

[All CPP Questions]

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

#include

int main ()

{

std::vectorv1;

for(int i = 10; i>0; i??)

{

v1.push_back(i);

}

std::vector::iterator it = v1.begin();

int sum = 0;

while(it != v1.end())

{

sum+=it++;

}

std::cout<<*v1.erase(v1.begin(),v1.end()?3)<<" "<

return 0;

}

Aprogram outputs 3 55

Bcompilation error

Cprogram outputs 3 45

Dprogram outputs 7 55

Show Suggested Answer

Suggested Answer: E

by Casie at Oct 21, 2024, 10:16 PM

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Paris

3 months ago

As a seasoned C++ programmer, I can tell you that this code is a dumpster fire waiting to happen. Trying to erase elements while iterating over the same vector? That's a recipe for disaster!

upvoted 0 times

Leonor

2 months ago

C) program outputs 3 45

upvoted 0 times

...

Luis

2 months ago

B) compilation error

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Katy

2 months ago

A) program outputs 3 55

upvoted 0 times

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Margarett

4 months ago

The program will output 7 55. The sum of the elements in the vector is 55, and the erase function will remove all but the last 3 elements, leaving 7 as the final element.

upvoted 0 times

Annice

2 months ago

C) program outputs 3 45

upvoted 0 times

...

Keith

2 months ago

B) compilation error

upvoted 0 times

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Jolanda

2 months ago

A) program outputs 3 55

upvoted 0 times

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Micheal

4 months ago

Haha, this code is a real brain-teaser! I bet the correct answer is going to be something totally unexpected. That's how they get you in these certification exams!

upvoted 0 times

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Eun

4 months ago

The program will output 3 55. The erase function returns an iterator to the element after the last element removed, and we're dereference that iterator to get the value 3.

upvoted 0 times