C++ Institute Exam CPP Topic 4 Question 63 Discussion

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

Question #: 63
Topic #: 4

[All CPP Questions]

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

#include

using namespace std;

int main () {

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

vector v (t,t+10);

vector::iterator it;

int m1[] = {1, 3, 2};

it = find_end (v.begin(), v.end(), m1, m1+3);

if (it != v.end())

cout << "Found at position: " << it?v.begin() << endl;

return 0;

}

Aprogram outputs: Found at position: 5

Bprogram outputs: Found at position: 0

Cno output

Dprogram outputs: Found at position: 10

Show Suggested Answer

Suggested Answer: C

by Frederica at Mar 01, 2023, 08:45 PM

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Elly

14 days ago

Ha! I bet the answer is 'D' - 'program outputs: Found at position: 10'. The 'find_end' function returns an iterator pointing to the last element of the found sequence, so we need to subtract the beginning of the vector to get the actual position. Classic C++ gotcha!

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Ciara

15 days ago

Wait, what? The code is trying to print the position of the found sequence, but it's using 'it?v.begin()' instead of 'it - v.begin()'. That's not going to work. I bet the output is going to be a bit... unexpected.

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Yong

19 days ago

Okay, let's see. The code is using the 'find_end' function from the 'algorithm' library to search for the sequence {1, 3, 2} in the vector 'v'. Sounds good so far.

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2 months ago

I think the answer is A.

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