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C++ Institute Exam CPP Topic 3 Question 81 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 81
Topic #: 3
[All CPP Questions]

What happens when you attempt to compile and run the following code? Choose all that apply.

#include

#include

#include

#include

#include

#include

using namespace std;

templatestruct Out {

ostream & out;

Out(ostream & o): out(o){}

void operator() (const T & val ) {out<

int main () {

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

fstream f("test.out", ios::trunc|ios::out);

list l(t, t+10);

for_each(l.begin(), l.end(), Out(f));

f.close(); f.open("test.out");

for( ; f.good() ; ) {

int i; f>>i;

cout<

}

f.close();

return 0;

}

Show Suggested Answer Hide Answer
Suggested Answer: E

by Arthur at Apr 12, 2024, 07:04 AM

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Mozell
1 months ago
This code is making my head spin! I wonder if the author had a thesaurus nearby when they wrote it. 'Truncate' and 'hexadecimal' in the same question? Yikes!
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Ruth
19 days ago
The code seems to involve file handling and output formatting.
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Iesha
1 months ago
Hmm, I'm not sure about option C. Doesn't the code open the file for writing, not reading? I think I'll go with A, B, and E.
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Matthew
3 days ago
Let's go with options A, B, and E then.
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Brynn
13 days ago
Yeah, I agree. So option C is not correct.
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Gary
15 days ago
I think you're right, the code opens the file for writing, not reading.
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Margurite
2 months ago
Wow, this code is really complex! I'm not sure I would have thought to use `for_each` and a custom functor to write the values to a file. That's some pretty advanced C++ right there.
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Justa
9 days ago
User3: I would have never thought to do it that way, it's impressive.
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Levi
11 days ago
User2: I agree, using for_each with a custom functor is pretty advanced.
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Lelia
1 months ago
User1: Yeah, this code is definitely not for beginners.
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Malika
2 months ago
I think the code looks good, but I'm a bit concerned about the use of `for_each` with a lambda function. Isn't that a bit overkill for this task? I would have just used a simple `for` loop.
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Nguyet
17 days ago
What happens when you attempt to compile and run the following code? Choose all that apply.
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Jacinta
1 months ago
What happens when you attempt to compile and run the following code? Choose all that apply.
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Iluminada
2 months ago
The correct answers are A, B, and E. The code creates a file named 'test.out', writes the values of the array to the file in hexadecimal format, and then reads the contents of the file and displays them on the console.
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Tamesha
3 months ago
I'm not sure, but I think the program will display the sequence 1 2 3 4 5 6 7 8 9 10 (E) in the end.
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Michel
3 months ago
I believe the file test.out will be truncated (B) when the code is compiled and run.
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Grover
3 months ago
I think the file test.out will be opened for writing (A).
upvoted 0 times
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