C++ Institute C++ Institute Certifications CPP Questions & Answers

• Question 221:

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

  #include

  #include

  #include

  using namespace std;

  int main ()

  {

  int t[] = {1, 2 ,3 ,4 ,5};

  vectorv1(t, t+5);

  listl1;

  l1.assign(v1.end(), v1.begin());

  for(int i=0; i

  {

  cout<

  }

  cout<

  return 0;

  }

  A. program displays 5 4 3 2 1

  B. program displays 1 2 3 4 5

  C. compilation error

  D. segmentation fault runtime exception

  Correct Answer: C

• Question 222:

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

  #include

  #include

  #include

  using namespace std;

  class B { int val;

  public:

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

  int getV() const {return val;} bool operator < (const B and v) const { return val

  ostream and operator <<(ostream and out, const B and v) { out<

  templatestruct Out {

  ostream and out;

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

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

  int main() {

  B t1[]={3,2,4,1,5};

  B t2[]={6,10,8,7,9};

  vector v1(10);

  sort(t1, t1+5);

  sort(t2, t2+5);

  merge(t1,t1+5,t2,t2+5,v1.begin());

  for_each(v1.begin(), v1.end(), Out(cout));cout<

  return 0;

  }

  Program outputs:

  A. 1 2 3 4 5 6 10 8 7 9

  B. 3 2 4 1 5 6 7 8 9 10

  C. 3 2 4 1 5 6 10 8 7 9

  D. 1 2 3 4 5 6 7 8 9 10

  E. compilation error

  Correct Answer: E

• Question 223:

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

  #include

  #include

  using namespace std;

  class B { int val;

  public:

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

  int getV() const {return val;} bool operator < (const B and v) const { return val>v.val;} };

  ostream and operator <<(ostream and out, const B and v) { out<

  templatestruct Out {

  ostream and out;

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

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

  int main() {

  B t1[]={3,2,4,1,5};

  B t2[]={5,6,8,2,1};

  vector v1(10,0);

  sort(t1, t1+5);

  sort(t2, t2+5);

  set_intersection(t1,t1+5,t2,t2+5,v1.begin());

  for_each(v1.begin(), v1.end(), Out(cout));cout<

  return 0;

  }

  Program outputs:

  A. compilation error

  B. 1 2 3 4 5 6 8 0 0 0

  C. 1 2 3 4 5 6 8 2 1 0

  D. 5 2 1 0 0 0 0 0 0 0

  E. 1 2 5 0 0 0 0 0 0 0

  Correct Answer: D

• Question 224:

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

  #include

  #include

  #include

  #include

  #include

  using namespace std;

  int main() {

  int t[] = { 3, 4, 2, 1, 0, 3, 4, 1, 2, 0 };

  vector v(t, t + 10);

  multimap m;

  for (vector::iterator i = v.begin(); i != v.end(); i++) {

  stringstream s;s << *i << *i;

  m.insert(pair(*i, s.str()));

  }

  pair::iterator, multimap::iterator> range;

  range = m.equal_range(2);

  for (multimap::iterator i = range.first; i != range.second; i++) {

  cout << i?>first << " ";

  }

  return 0;

  }

  A. 2 2

  B. 1 2

  C. 1 3

  D. 2

  E. 0 2

  Correct Answer: A

• Question 225:

  What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: one two three?

  #include

  #include

  using namespace std;

  int main ()

  {

  string a;

  cin>>a;

  cout<

  return 0;

  }

  Program will output:

  A. one

  B. one two three

  C. runtime exception

  D. compilation error

  E. the result is unspecified

  Correct Answer: A

• Question 226:

  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; };};

  templatestruct Out {

  ostream and out;

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

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

  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;

  }

  A. file test.out will be opened writing

  B. file test.out will be truncated

  C. file test.out will be opened for reading

  D. compilation error

  E. program will display sequence 1 2 3 4 5 6 7 8 9 10

  Correct Answer: D

• Question 227:

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

  #include

  #include

  #include

  using namespace std;

  templatestruct Out {

  ostream and out;

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

  void operator()(const T and val ) {

  out<

  }

  };

  struct Sequence {

  int start;

  Sequence(int start):start(start){}

  int operator()() {

  return start++ ; }};

  int main() {

  vector v1(10);

  generate(v1.rbegin(), v1.rend(), Sequence(1));

  rotate(v1.begin(),v1.begin() + 1, v1.end() );

  for_each(v1.begin(), v1.end(), Out(cout) );cout<

  return 0;

  }

  Program outputs:

  A. 1 2 3 4 5 6 7 8 9 10

  B. 10 9 8 7 6 5 4 3 2 1

  C. 9 8 7 6 5 4 3 2 1 10

  D. 1 10 9 8 7 6 5 4 3 2

  Correct Answer: C

• Question 228:

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

  #include

  #include

  #include

  using namespace std;

  int main(){

  int t[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 0 };

  vectorv(t, t+10);

  multiset s1(v.begin(),v.end());

  s1.insert(v.begin(),v.end());

  pair::iterator,multiset::iterator> range;

  range = s1.equal_range(6);

  while (range.first != range.second) {

  cout<<*range.first<<" "; range.first++;

  }

  return 0;

  }

  A. program outputs: 6 6

  B. program outputs: 5 7

  C. program outputs: 5 5 6 6 7 7

  D. program outputs: 5 5 7 7

  E. program outputs: 1 1 6 6 5 5

  Correct Answer: A