Câu 54: CPP: C++ Certified Professional Programmer

What will happen when you attempt to compile and run the code below, assuming that file test.in contains the following sequence: 1 2 3?#include #include #include #include #include using namespace std;template struct Out {ostream & out;Out(ostream & o): out(o){}void operator() (const T & val ) {out l;for( ; f.good() ; ) {int i;f>>i;l.push_back(i);}f.close();for_each(l.begin(), l.end(), Out (cout));return 0;}Program will output:

1. A. 1 2 3 — đáp án hiện tại
2. B. 1 2 3 3
3. C. no output
4. D. compilation error
5. E. program runs forever without output