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C++ Institute CPP Exam - Topic 9 Question 110 Discussion

What happens when you attempt to compile and run the following code?#include #include using namespace std;int main() {int t[] = { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5 };string s[] = { "one", "one", "two", "two", "three","three", "four", "four", "five", "five"};map m;for (int i = 0; i < 10; i++) {m.push_back(pair(t[i], s[i]));}for (map::iterator i = m.begin(); i != m.end(); i++) {cout first
B) compilation error
A) program outputs: 1 2 3 4 5
C) program outputs: 1 1 2 2 3 3 4 4 5 5
D) program outputs: one two three four five
E) program outputs: one one two two three three four four five five

C++ Institute CPP Exam - Topic 9 Question 110 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 110
Topic #: 9
[All CPP Questions]

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

#include

#include

using namespace std;

int main() {

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

string s[] = { "one", "one", "two", "two", "three","three", "four", "four", "five", "five"};

map m;

for (int i = 0; i < 10; i++) {

m.push_back(pair(t[i], s[i]));

}

for (map::iterator i = m.begin(); i != m.end(); i++) {

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

}

return 0;

}

Show Suggested Answer Hide Answer
Suggested Answer: B

by Solange at Jul 04, 2025, 11:52 PM

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Nathalie
8 months ago
Wait, are you sure? I thought it would just ignore duplicates.
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Ronna
8 months ago
Totally agree, maps use insert, not push_back!
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Haydee
9 months ago
Looks like a compilation error due to push_back on map.
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Gracie
9 months ago
I thought it would output 1 2 3 4 5, but now I'm confused!
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Daniela
9 months ago
Definitely a compilation error, no doubt about it.
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Cordelia
9 months ago
I remember that the `map` should store unique keys, so I guess it will output "one two three four five" based on the last occurrences.
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Bea
10 months ago
I practiced a similar question, and I think the iterator part might have a syntax issue with `i?>first`.
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Mattie
10 months ago
I’m not sure, but I feel like the output should be unique keys, so maybe it will print "1 2 3 4 5"?
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Veronika
10 months ago
I think there’s a compilation error because I remember that `map` doesn’t have a `push_back` method.
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Amos
10 months ago
Ah, I see the problem now. The map is going to store each key-value pair, but since the keys are duplicates, it will only output the unique keys.
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Vinnie
10 months ago
I'm a bit confused about how the map is being populated. Shouldn't we be using the map.insert() method instead of push_back()?
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Virgina
11 months ago
I'm pretty confident I know the answer to this one. The map will automatically sort the keys, so the output should be the unique numbers in order.
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Deonna
11 months ago
Okay, I think I see the issue. The map.push_back() method doesn't exist, so that's going to cause a compilation error.
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Felicitas
11 months ago
Hmm, this looks tricky. I'll need to carefully read through the code and think about how the map data structure works.
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Sheron
1 year ago
I'm going with option E. The map will preserve the order of the elements, so it'll print out all the values.
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Evan
11 months ago
Yes, I agree. The program will output: one one two two three three four four five five.
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Princess
12 months ago
I think it's option E because the map will keep the order of the elements.
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Dana
1 year ago
Option D seems like the way to go. The map should store the unique keys and their corresponding values.
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Carissa
1 year ago
Haha, option C would be hilarious! The map just prints out the keys without caring about the values. What a mess!
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Loren
1 year ago
I believe the error is due to the use of push_back with a map.
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Annett
1 year ago
I agree with Brock, there seems to be an issue with the code.
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Providencia
1 year ago
I think the correct answer is B. The code has a compilation error because you can't use push_back() with a map.
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Octavio
1 year ago
The output should be option A, since the map will automatically handle the duplicate keys and only store unique values.
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Scot
1 year ago
B) compilation error
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Scot
1 year ago
B) compilation error
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Brock
1 year ago
I think the answer is B) compilation error.
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