Câu 4: CPP: C++ Certified Professional Programmer

What happens when you attempt to compile and run the following code?#include #include #include #include #include #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; };};template struct Out {ostream & out;Out(ostream & o): out(o){}void operator() (const T & val ) {out 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<<i<<" ";}f.close();return 0;}

1. A. file test.out will be opened writing
2. B. file test.out will be truncated
3. C. file test.out will be opened for reading
4. D. compilation error — đáp án hiện tại
5. E. program will display sequence 1 2 3 4 5 6 7 8 9 10