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

What happens when you attempt to compile and run the following code?#include #include #include using namespace std;void myfunction(pair i) {cout
D) 1 3 8 7 4 2 6 9 5 10
A) 10 5 9 6 2 4 7 8 3 1
B) 0 1 2 3 4 5 6 7 8 9
C) 9 8 7 6 5 4 3 2 1 0
E) compilation error

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:

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Suggested Answer: D

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

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Kathrine
9 months ago
Wait, are we sure it won't throw any errors?
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Beata
9 months ago
No way, it can't be option E, the code looks fine.
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Merlyn
10 months ago
I thought it would be option A at first!
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Gladys
10 months ago
Definitely option B, since the keys are 0 to 9.
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Shaquana
10 months ago
It outputs the first elements of the pairs in the map.
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Jennie
10 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
10 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
11 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
11 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
11 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
11 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
11 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
11 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
11 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
1 year 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
1 year 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
1 year 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
1 year ago
A) 10 5 9 6 2 4 7 8 3 1
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Jules
1 year 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
1 year 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
1 year ago
No way, it's definitely B. The keys are printed in ascending order.
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Jacqueline
1 year ago
I think it's A, not C. The keys are printed in order, not reverse.
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Lawrence
1 year 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
1 year ago
E) compilation error
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Johana
1 year ago
D) 1 3 8 7 4 2 6 9 5 10
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Aron
1 year ago
C) 9 8 7 6 5 4 3 2 1 0
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Hildred
1 year ago
B) 0 1 2 3 4 5 6 7 8 9
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Joanna
1 year ago
B) 0 1 2 3 4 5 6 7 8 9
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Brice
1 year ago
A) 10 5 9 6 2 4 7 8 3 1
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Mona
1 year 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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