C++ Institute Exam CPP Topic 9 Question 91 Discussion

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

Question #: 91
Topic #: 9

[All CPP Questions]

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

#include

using namespace std;

templatestruct Out {

ostream & out;

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

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

int main() {

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

vector v1(t, t+10);

for_each(v1.begin(), v1.end(), bind1st(plus(), 1));

for_each(v1.rbegin(), v1.rend(), Out(cout));cout<

return 0;

}

Program outputs:

A3 2 4 1 5 6 10 8 7 9

B4 3 5 2 6 7 11 9 8 10

C9 7 8 10 6 5 1 4 2 3

D10 8 9 11 7 6 2 5 3 4

Ecompilation error

Show Suggested Answer

Suggested Answer: B

by Casandra at Aug 03, 2024, 06:08 PM

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Avery

2 months ago

The correct answer is B) 0 1. The for_each loop adds 1 to each element, so the vector becomes 4 3 5 2 6 1 11 9 8 10. Then the reversed for_each loop prints these elements, but the last element is printed as 0 because it's out of range.

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2 months ago

Hmm, I'm not sure. The code looks a bit complex, but I'd guess the output is 1 1, since the for_each loop is adding 1 to each element and then the reversed for_each is printing 1 for each element.

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