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C++ Institute CPP Exam - Topic 6 Question 105 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 105
Topic #: 6
[All CPP Questions]

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

#include

#include

#include

using namespace std;

void myfunction(pair i) {

cout << " " << i.first;

}

int main() {

int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };

map m;

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

m[i]=t[i];

}

for_each(m.begin(), m.end(), myfunction);

return 0;

}

Program outputs:

Show Suggested Answer Hide Answer
Suggested Answer: D

by France at Mar 04, 2025, 10:13 PM

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Kathrine
4 months ago
Wait, are we sure it won't throw any errors?
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Beata
5 months ago
No way, it can't be option E, the code looks fine.
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Merlyn
5 months ago
I thought it would be option A at first!
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Gladys
5 months ago
Definitely option B, since the keys are 0 to 9.
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Shaquana
5 months ago
It outputs the first elements of the pairs in the map.
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Jennie
6 months ago
I'm a bit confused. Could there be a compilation error if the function signature doesn't match what `for_each` expects?
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Gerald
6 months ago
I feel like I've seen a similar question before, and the output was related to the values in the map, but I can't recall exactly.
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Thea
6 months ago
I remember something about maps in C++. The keys are integers, so maybe the output is just the keys in order?
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Kanisha
6 months ago
I think the code should compile fine since all the includes are correct, but I'm not sure what the output will be.
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Ira
6 months ago
This seems like a good opportunity to practice my C++ knowledge. I'll work through the code carefully and try to come up with the correct output.
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Louann
6 months ago
I'm not too familiar with the for_each() function, so I'll need to look that up in the documentation to make sure I understand how it's being used here.
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Kiley
6 months ago
Okay, I think I've got it. The code is iterating through the map and calling the myfunction() function on each key-value pair. I'll work through the logic step-by-step to determine the output.
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Izetta
6 months ago
Hmm, I'm a bit confused by the use of the map data structure here. I'll need to think through how that's being used in the code.
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Quentin
6 months ago
This looks like a pretty straightforward question. I'll start by carefully reading through the code to understand what it's doing.
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Una
11 months ago
Hold on, is that a typo in the code? 'pair' instead of 'pair'? Clearly, the answer is E. Someone call the compiler police!
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Pamela
11 months ago
B, definitely. Though I have to say, the real question is why anyone would want to do this in the first place. Seems like a lot of work just to print an array in order.
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Carmelina
11 months ago
E. Compilation error? Psh, please. This code is as clean as a whistle. I'm going with A. Just a good ol' fashioned array printing, nothing to see here.
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Abraham
10 months ago
A) 10 5 9 6 2 4 7 8 3 1
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Jules
11 months ago
Ah, the old 'map the array to a map and then print the keys' trick. Clever, but I'm gonna go with C. Gotta keep those numbers in reverse order, you know.
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Mirta
10 months ago
I agree with you, it's E. There will be a compilation error because myfunction should take a const pair& as argument.
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Renay
10 months ago
No way, it's definitely B. The keys are printed in ascending order.
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Jacqueline
11 months ago
I think it's A, not C. The keys are printed in order, not reverse.
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Lawrence
12 months ago
The correct answer is B. The code iterates through the map and prints the keys, which are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
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Ronald
10 months ago
E) compilation error
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Johana
10 months ago
D) 1 3 8 7 4 2 6 9 5 10
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Aron
11 months ago
C) 9 8 7 6 5 4 3 2 1 0
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Hildred
11 months ago
B) 0 1 2 3 4 5 6 7 8 9
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Joanna
11 months ago
B) 0 1 2 3 4 5 6 7 8 9
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Brice
11 months ago
A) 10 5 9 6 2 4 7 8 3 1
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Mona
11 months ago
A) 10 5 9 6 2 4 7 8 3 1
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Dulce
1 year ago
I'm not sure about that. I think there might be a compilation error because the myfunction is expecting a pair but the map contains pairs of int, int. So, the correct answer might be E) compilation error.
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Reiko
1 year ago
I agree with Cristy. The code is iterating over the map and calling the myfunction for each pair, which will output the keys in ascending order.
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Cristy
1 year ago
I think the output will be B) 0 1 2 3 4 5 6 7 8 9 because the code is using a map to store key-value pairs and then iterating over it using for_each.
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