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

• Question 41:

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

  #include

  #include

  #include

  #include

  #include

  using namespace std;

  int main()

  {

  deque mydeck;list mylist; vector myvector;

  queue first; queue second(mydeck);

  queue third(second); queue > fourth(mylist);

  fourth.push(10);fourth.push(11);fourth.push(12);

  queue > fifth(myvector);

  fifth.push(10);fifth.push(11);fifth.push(12); // Line I

  while(!fifth.empty())

  {

  cout<

  fifth.pop(); // Line III

  } while (!fourth.empty()) { cout << fourth.front() << " "; fourth.pop(); // Line IV } return 0; }

  A. program outputs: 10 11 12 10 11 12

  B. compilation error in line I

  C. compilation error in line II

  D. compilation error in line III

  E. compilation error in line IV

  Correct Answer: D

• Question 42:

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

  #include

  #include

  using namespace std;

  class A

  {

  int a;

  public:

  A():a(0){} A(int a){ this?>a = a;}

  void setA(int a) {this?>a = a;}

  int getA() {return a;}

  };

  ostream andoperator<<(ostream and cout, A and a)

  {

  cout<< a.getA();

  return cout;

  }

  int main ()

  {

  vectorv(5, new A());

  v.push_back(new A(1));

  vector::iterator it;

  for(it = v.begin(); it != v.end(); it++)

  {

  cout<<*it<<" ";

  }

  cout<

  return 0;

  }

  A. program outputs 0 0 0 0 0 1

  B. program outputs 0 0 0 0 0 0

  C. compilation error

  D. program outputs 1 1 1 1 1 1

  E. none of these

  Correct Answer: E

• Question 43:

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

  #include

  #include

  int main ()

  {

  std::vectorv1;

  for(int i = 0; i<10; i++) {v1.push_back(i); }

  std::vector v2(v1.begin()+2, v1.end()?2);

  std::vector::iterator it = v2.begin();

  for( ; it != v2.end(); it++) {std::cout<<*it++<<" "; }std::cout<

  return 0;

  }

  A. compilation error

  B. program outputs 0 1 2 3 4 5 6 7 8 9

  C. program outputs 2 3 4 5 6 7

  D. program outputs 2 4 6

  Correct Answer: D

• Question 44:

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

  #include

  #include

  #include

  #include

  using namespace std;

  class B { int val;

  public:

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

  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<struct Out {

  ostream and out;

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

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

  int main() {

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

  deque d1(t, t+10);

  sort(d1.begin(), d1.end(), greater());

  deque::iterator it = lower_bound(d1.begin(), d1.end(), 4,greater());

  for_each(it, d1.end(), Out(cout));cout<

  return 0;

  }

  Program outputs:

  A. 4 3 2 1

  B. 3 2 1

  C. 5 4 3 2 1

  D. compilation error

  E. 1 2 3 4

  Correct Answer: A

• Question 45:

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

  #include

  #include

  using namespace std;

  int main() {

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

  string s[] = { "one", "one", "two", "two", "three","three", "four", "four", "five", "five"};

  map m;

  for (int i = 0; i < 10; i++) {

  m.insert(pair(t[i], s[i]));

  }

  if (m.count(3) == 2) {

  m.erase(3);

  }

  for (map::iterator i = m.begin(); i != m.end(); i++) {

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

  }

  return 0;

  }

  A. program outputs: 1 2 3 4 5

  B. program outputs: 1 2 4 5

  C. program outputs: 1 1 2 2 3 4 4 5 5

  D. program outputs: 1 1 2 3 3 4 4 5 5

  E. program outputs: one two three four five

  Correct Answer: A

• Question 46:

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

  #include

  #include

  class A {

  public:

  virtual int f() { return 10; }

  virtual ~A(){}

  };

  class B: public A {

  int f() {return 11; }

  virtual ~B(){}

  };

  int main (){

  std::vectorv1;

  for(int i = 10; i>0; i??)

  {

  i%2>0?v1.push_back(new A()):v1.push_back(new B());

  }

  std::vector::iterator it = v1.begin();

  while(it != v1.end())

  {

  std::cout<f()<<" ";

  v1.pop_back();++it;

  }

  return 0;

  }

  A. destructor of class A will be called

  B. destructor of class B will be called

  C. code will not compile

  D. program outputs 10 11 10 11 10

  E. program outputs 10 11 10 11 10 11 10 11 10 11

  Correct Answer: D

• Question 47:

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

  #include

  #include

  #include

  #include

  using namespace std;

  class B { int val;

  public:

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

  int getV() const {return val;}

  B operator +(const B andb )const { return B(val + b.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<

  template

  struct Add : public binary_function {

  A operator() (const A and a, const A and b) const { return a+b; } };

  int main() {

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

  deque d1(t, t+10);

  deque d2(10);

  transform(d1.begin(), d1.end(), d2.begin(), bind2nd(Add(), 1));

  for_each(d2.rbegin(), d2.rend(), Out(cout));cout<

  return 0;

  }

  Program outputs:

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

  B. 2 3 4 5 6 7 8 9 10 11

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

  D. 11 10 9 8 7 6 5 4 3 2

  E. compilation error

  Correct Answer: D

• Question 48:

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

  #include

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

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

  deque d1(t, t+10);

  set s1(t, t+10);

  sort(d1.begin(), d1.end());

  cout<

  <

  return 0;

  }

  Program outputs:

  A. 1 1

  B. 1 0

  C. 0 1

  D. 0 0

  E. compilation error

  Correct Answer: A

• Question 49:

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

  #include

  #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 Add {

  int operator()(int a, int b) {

  return a+b;

  }

  };

  int main() {

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

  vector v1(t, t+10);

  vector v2(10);

  transform(v1.begin(), v1.end(), v2.begin(), bind1st(ptr_fun (Add()), 1));

  for_each(v2.rbegin(), v2.rend(), Out(cout));cout<

  return 0;

  }

  Program outputs:

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

  B. 2 3 4 5 6 7 8 9 10 11

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

  D. 11 10 9 8 7 6 5 4 3 2

  E. compilation error

  Correct Answer: E

• Question 50:

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

  #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;} };

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

  vector v1(t, t+10);

  transform(v1.begin(), v1.end(), v1.begin(), bind2nd(plus(), 1));

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

  }

  Program outputs:

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

  B. 4 3 5 2 6 7 11 9 8 10

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

  D. 10 8 9 11 7 6 2 5 3 4

  E. compilation error

  Correct Answer: D