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

• Question 21:

  What happens 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, 6, 5, 7, 9, 8, 0 };

  vector v(t, t + 10);

  map m;

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

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

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

  }

  pair::iterator, map::iterator> range;

  range = m.equal_range(6);

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

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

  }

  return 0;

  }

  A. program outputs: 6

  B. program outputs: 5 7

  C. program outputs: 6 7

  D. program outputs: 1 5

  E. program outputs: 6 5

  Correct Answer: A

• Question 22:

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

  #include

  #include

  using namespace std;

  class A {

  int a;

  public:

  A(int a) : a(a) {}

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

  };

  struct Even {

  bool operator ()(const A and a, const A andb) {

  return (a.getA() % 2)==b.getA() % 2;

  }

  };

  int main () {

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

  deque d (t,t+15);

  deque::iterator it = search_n(d.begin(), d.end(), 3, 2, Even());

  cout<< it?d.begin()<

  return 0;

  }

  Program outputs:

  A. compilation error

  B. 12

  C. 3

  D. 1

  E. 15

  Correct Answer: B

• Question 23:

  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<

  };

  int main() {

  char s[]={"qwerty"};

  char t1[]={"ert"};

  char t2[]={"ERT"};

  sort(s, s+6);

  cout<

  return 0;

  } Program outputs:

  A. 0 0

  B. 0 1

  C. 1 0

  D. 1 1

  Correct Answer: C

• Question 24:

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

  #include

  #include

  #include

  #include

  #include

  using namespace std;

  void myfunction(int i) {

  cout << " " << i;

  }

  int add (int a, int b) { return a+b; }

  int main() {

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

  vector v1(t, t+10);

  set s1(t, t+10);

  deque d1;

  d1.resize(s1.size());

  transform(s1.begin(), s1.end(), v1.begin(), d1.begin(), add);

  for_each(d1.begin(), d1.end(), myfunction);

  return 0;

  }

  Program outputs:

  A. 0 0 0 0 0 0 0 0 0 0

  B. 11 7 12 10 7 10 14 16 12 11

  C. compilation error

  D. runtime exception

  E. 20 10 18 12 4 8 14 16 6 2

  Correct Answer: B

• Question 25:

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

  #include

  #include

  #include

  using namespace std;

  class A {

  int a;

  public:

  A(int a) : a(a) {}

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

  bool operator==(A and b) { return a == b.a; }

  };

  struct Compare{

  bool operator()(const A and a, const A and b) {return a.getA()==b.getA();};

  };

  int main () {

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

  vector v (t,t+10);

  vector::iterator it;

  A m1[] = {A(1), A(2), A(3)};

  it = find_end (v.begin(), v.end(), m1, m1+3, Compare());

  cout << "Found at position: " << it?v.begin() << endl;

  return 0;

  }

  A. program outputs: Found at position: 5

  B. program outputs: Found at position: 0

  C. program outputs: Found at position: 7

  D. compilation error

  E. program outputs: Found at position: 10 ***/

  Correct Answer: A

• Question 26:

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

  #include

  #include

  #include

  #include

  using namespace std;

  int main() {

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

  vector v1(t, t + 15);

  set s1(t, t + 15);

  pair::iterator, vector::iterator > resultSet = equal(s1.begin(), s1.end(), v1.begin());

  cout<<*resultSet.first<<" "<<*resultSet.second<

  }

  Program outputs:

  A. 2 4

  B. 4 2

  C. 0 5

  D. compilation error

  Correct Answer: D

• Question 27:

  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<

  int main() {

  string t[]={"aaa","Aaa", "aAa","aaA","bbb","Bbb", "bBb", "bbB"};

  vector v1(t, t+8);

  sort(v1.begin(), v1.end());

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

  return 0;

  }

  Program outputs:

  A. Aaa Bbb aAa aaA aaa bBb bbB bbb

  B. Aaa aAa Bbb aaA aaa bBb bbB bbb

  C. bBb bbB bbb Aaa aAa Bbb aaA aaa

  D. Aaa aAa bBb bbB bbb Bbb aaA aaa

  E. compilation error

  Correct Answer: A

• Question 28:

  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 10*(1+(start++ %3)); }

  };

  int main() {

  vector v1(10);

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

  unique(v1.begin(),v1.end());

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

  return 0;

  }

  Program outputs:

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

  B. 20 30 10

  C. 30 10 20

  D. compilation error

  Correct Answer: A

• Question 29:

  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 : public binary_function {

  int operator() (const int and a, const int 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 30:

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

  #include

  #include

  #include

  #include

  using namespace std;

  void myfunction(int i) {

  cout << " " << i;

  }

  int main() {

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

  vector v1(t, t+10);

  set s1(t, t+10);

  replace(v1.begin(), v1.end(), 1, 10);

  replace(s1.begin(), s1.end(), 1, 10);

  for_each(v1.begin(), v1.end(), myfunction);

  return 0;

  }

  Program outputs:

  A. 10 5 2 5 2 4 4 3 3 1

  B. 1 10 2 5 2 4 4 3 3 10

  C. compilation error

  D. 10 5 2 5 2 4 4 3 3 10

  Correct Answer: C