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

• Question 11:

  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);

  vector v2(10);

  generate(v1.begin(), v1.end(), Sequence(1));

  random(v1.begin(),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. 8 2 4 9 5 7 10 6 1 3

  D. compilation error

  Correct Answer: D

• Question 12:

  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>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() {

  int t[]={20, 30, 10, 20, 30, 10, 20, 30, 10, 20};

  deque d1(t, t+10);

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

  pair ::iterator, deque::iterator > result = equal_range(d1.begin(), d1.end(), B(20), greater());

  for_each(result.first, result.second, Out(cout));cout<

  return 0;

  }

  Program outputs:

  A. 30 30 30 20 20 20 20 10 10 10

  B. 20 20 20 20

  C. 30 20 20 20 10

  D. 20 20 20 20 10

  E. 30 20 20 20 20 10

  Correct Answer: B

• Question 13:

  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<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());

  set s1(t,t+10);

  cout<

  return 0;

  }

  Program outputs:

  A. 1 0

  B. 1 1

  C. 0 0

  D. 0 1

  E. compilation error

  Correct Answer: B

• Question 14:

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

  vector v1(t,t+10);

  cout<<*max_element(v1.begin(), v1.end(), greater());

  cout<

  return 0;

  }

  Program outputs:

  A. 3

  B. 1

  C. 6

  D. 10

  E. compilation error

  Correct Answer: B

• Question 15:

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

  #include

  using namespace std;

  class C {};

  template

  class A {

  T_v;

  public:

  A() {}

  A(T v): _v(v){}

  T getV() { return _v; }

  void add(T a) { _v+=a; }

  };

  int main()

  {

  A b;

  Aa;

  a.add(C());

  cout << b.getV() <

  return 0;

  }

  A. program will display:0

  B. program will not compile

  C. program will compile

  D. program will cause runtime exception

  Correct Answer: B

• Question 16:

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

  #include

  #include

  using namespace std;

  int main ()

  {

  bool a,b;

  cin>>a>>b;

  cout<

  return 0;

  }

  Program will output:

  A. truetrue

  B. falsefalse

  C. 11

  D. 00

  E. none of these

  Correct Answer: E

• Question 17:

  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};

  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 18:

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

  #include

  #include

  using namespace std;

  bool mycomparison (int first, int second){return first>second;}

  template

  void print(T start, T end) {

  while (start != end) {

  std::cout << *start << " "; start++;

  }

  }

  int main()

  {

  int t1[] ={ 1, 7, 8, 4, 5 };

  list l1(t1, t1 + 5);

  int t2[] ={ 3, 2, 6, 9, 0 };

  list l2(t2, t2 + 5);

  l1.sort(mycomparison);

  l2.sort(mycomparison);

  l1.merge(l2,mycomparison);

  print(l1.begin(), l1.end());

  print(l2.begin(), l2.end()); cout<

  return 0;

  }

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

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

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

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

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

  Correct Answer: A

• Question 19:

  What happens when you attempt to compile and run the following code? Choose all that apply.

  #include

  #include

  using namespace std;

  int main ()

  {

  vectorv1(10, 3);

  v1.push_back(3);

  cout<

  return 0;

  }

  A. program displays 4 4

  B. program displays 10 3

  C. size of vector v1 is 11

  D. all elements of vector v1 are of the same value

  Correct Answer: CD

• Question 20:

  What happens when you attempt to compile and run the following code? Choose all possible answers.

  #include

  using namespace std;

  class C {

  public:

  int _c;

  C():_c(0){}

  C(int c) { _c = c;}

  C operator+=(C and b) {

  C tmp; tmp._c = _c+b._c;

  return tmp;

  } };

  ostream and operator<<(ostream and c, const C and v) {

  c<

  template

  class A {

  T_v;

  public:

  A() {}

  A(T v): _v(v){}

  T getV() { return _v; }

  void add(T and a) { _v+=a; }

  };

  int main()

  {

  A b(2);

  Aa (5);

  a.add(C());

  cout << a.getV() <

  return 0;

  }

  A. program will display:5

  B. program will not compile

  C. program will compile

  D. program will cause runtime exception

  Correct Answer: AC