What will happen when you attempt to compile and run the following code?#include #include #include #include #include using namespace std;int main() {int t[] = { 3, 4, 2, 1, 0, 3, 4, 1, 2, 0 };vector v(t, t + 10);multimap m;for (vector::iterator i = v.begin(); i != v.end(); i++) {stringstream s;s

Discuss C++ Institute CPP Exam Topic 7 Question 128

C++ Institute CPP Exam - Topic 7 Question 128 Discussion

Posted by Trinidad on Aug 16, 2026 at 04:34 PM

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

#include

using namespace std;

int main() {

int t[] = { 3, 4, 2, 1, 0, 3, 4, 1, 2, 0 };

vector v(t, t + 10);

multimap m;

for (vector::iterator i = v.begin(); i != v.end(); i++) {

stringstream s;s << *i << *i;

m.insert(pair(*i, s.str()));

}

pair::iterator, multimap::iterator> range;

range = m.equal_range(2);

for (multimap::iterator i = range.first; i != range.second; i++) {

cout << i?>first << " ";

}

return 0;

}

The output will be:

Suggested Answer: A

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13 comments · newest first

Barney 8 hours ago

No way, it has to be A. The loop inserts 2 twice.

Truman 5 days ago

But what about option D? Just 2?

Edda 11 days ago

I feel like it should be option A too.

Carmen 16 days ago

I think it will output 2 2.

Dalene 21 days ago

The stringstream part is clever!

Jerlene 26 days ago

I thought it would be "1 2" instead.

Melinda 1 month ago

Wait, how does it get "2 2"?

Katina 1 month ago

Definitely outputs "2 2".

Adelaide 1 month ago

The code compiles without errors.

Ernie 2 months ago

I believe the output should be just "2" since that's the only key that matches in the multimap, but I might be mixing it up with another question we did.

Olive 2 months ago

I’m a bit confused about the `stringstream` part. Does it actually concatenate the number twice? I feel like that might affect what gets stored in the multimap.

Louis 2 months ago

I remember something similar from practice where we used `equal_range` with a multimap. I think it should return all entries with the key 2, but I can't recall what those entries were.

Katie 2 months ago

I think the code will compile fine, but I'm not sure about the output. It seems like it should print the values associated with the key 2.

Thread summary

● Consensus

Community pick: Yes strong agreement

Vote breakdown

A 97%

B 3%

C 1%

D 2%

E 2%

Summary updated from 13 comments · last activity 8 hours ago

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Created dateAug 16, 2026
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