C++ Institute Exam CPP Topic 8 Question 100 Discussion

Actual exam question for C++ Institute's CPP exam

Question #: 100
Topic #: 8

[All CPP Questions]

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

#include

using namespace std;

class B { int val;

public:

B(int v=0):val(v){}

int getV() const {return val;}

operator int() const { return val; };};

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() ; ) {

B i;

f>>i;

cout<

}

f.close();

return 0;

}

Afile test.out will be opened writing

Bfile test.out will be truncated

Cfile test.out will be opened for reading

Dcompilation error

Eprogram will display sequence 1 2 3 4 5 6 7 8 9 10

Show Suggested Answer Hide Answer

Suggested Answer: D

by Tamra at Nov 13, 2024, 05:57 AM

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Louvenia
2 days ago

Ah, the joys of C++ programming. Where the syntax is like a maze, and the output is a riddle wrapped in an enigma. I wonder if the exam will have a bonus round for interpretive dance?

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Virgina
3 days ago

I'm going with E. The code looks like it's writing the contents of the list to the file, and then reading them back out. Should be a piece of cake! Now, if only the exam questions were this straightforward...

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Melissa
5 days ago

This is a tricky one! I'm leaning towards C, since the code is opening the file for reading after writing to it. But then again, the output suggests E might be the right answer. Decisions, decisions...

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Lucina
7 days ago

Hmm, I'm torn between B and E. The code seems to be opening the file for writing, and then reading from it. I'll go with B, just to be safe. Wouldn't want to end up with a compile error!

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Makeda
8 days ago

I'm not sure, but I think it might be D) compilation error.

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Eleonore
10 days ago

I agree with Amira, because the code is opening the file in trunc mode.

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Charlene
13 days ago

The code looks correct, so I'd say the correct answer is E. The program will display the sequence 1 2 3 4 5 6 7 8 9 10. Can't wait to see if I get this one right!

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Amira
14 days ago

I think the answer is B) file test.out will be truncated.

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