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What happens when you attempt to compile and run the following code?
#include
#include
#include
using namespace std;
void myfunction(pair
cout << " " << i.first;
}
int main() {
int t[] = { 10, 5, 9, 6, 2, 4, 7, 8, 3, 1 };
map
for(int i=0; i < 10; i++) {
m[i]=t[i];
}
for_each(m.begin(), m.end(), myfunction);
return 0;
}
Program outputs:
Suggested Answer: D
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33 comments · newest first
KA
Kathrine
11 months ago
Wait, are we sure it won't throw any errors?
BE
Beata
11 months ago
No way, it can't be option E, the code looks fine.
ME
Merlyn
11 months ago
I thought it would be option A at first!
GL
Gladys
11 months ago
Definitely option B, since the keys are 0 to 9.
SH
Shaquana
11 months ago
It outputs the first elements of the pairs in the map.
JE
Jennie
12 months ago
I'm a bit confused. Could there be a compilation error if the function signature doesn't match what `for_each` expects?
GE
Gerald
12 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.
TH
Thea
12 months ago
I remember something about maps in C++. The keys are integers, so maybe the output is just the keys in order?
KA
Kanisha
1 year ago
I think the code should compile fine since all the includes are correct, but I'm not sure what the output will be.
IR
Ira
1 year 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.
LO
Louann
1 year 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.
KI
Kiley
1 year 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.
IZ
Izetta
1 year 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.
QU
Quentin
1 year ago
This looks like a pretty straightforward question. I'll start by carefully reading through the code to understand what it's doing.
UN
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!
PA
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.
CA
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.
AB
Abraham
1 year ago
A) 10 5 9 6 2 4 7 8 3 1
JU
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.
MI
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.
RE
Renay
1 year ago
No way, it's definitely B. The keys are printed in ascending order.
JA
Jacqueline
1 year ago
I think it's A, not C. The keys are printed in order, not reverse.
LA
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.
RO
Ronald
1 year ago
E) compilation error
JO
Johana
1 year ago
D) 1 3 8 7 4 2 6 9 5 10
AR
Aron
1 year ago
C) 9 8 7 6 5 4 3 2 1 0
HI
Hildred
1 year ago
B) 0 1 2 3 4 5 6 7 8 9
JO
Joanna
1 year ago
B) 0 1 2 3 4 5 6 7 8 9
BR
Brice
1 year ago
A) 10 5 9 6 2 4 7 8 3 1
MO
Mona
1 year ago
A) 10 5 9 6 2 4 7 8 3 1
DU
Dulce
2 years 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.
RE
Reiko
2 years 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.
CR
Cristy
2 years 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.