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

• Question 31:

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

  #include

  #include

  #include

  using namespace std;

  template void print(T start, T end) {

  while (start != end) {

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

  }

  }

  int main(){

  vectorv;

  set s;

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

  v.push_back(i);

  s.push_back(i);

  }

  print(v.begin(), v.end()); print(s.begin(), s.end());cout<

  return 0;

  }

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

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

  C. 10 9 8 7 6 5 4 3 2 1 and unpredictable sequence of number range 1 to 10

  D. compilation error

  Correct Answer: D

• Question 32:

  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, 6 , 7, 8 , 9, 10};

  vectorv1(t, t+10);

  dequed1(t, t+10);

  vector::iterator it1 = v1.begin();

  deque::iterator it2 = d1.begin();

  d1.erase(it2+5);

  it2 = d1.begin();

  cout<<*(it2+5)<<" ";

  v1.erase(it1+5);

  it1 = v1.begin();

  cout<<*(it1+5)<

  }

  A. program outputs: 7 7

  B. program outputs: 6 6

  C. compilation error

  D. result is unpredictable

  Correct Answer: A

• Question 33:

  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() {

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

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

  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

  Correct Answer: A

• Question 34:

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

  set s1(t, t+10);

  vector v1(s1.rbegin(), s1.rend());

  swap(s1, v1);

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

  for_each(s1.begin(), s1.end(), myfunction);

  return 0;

  }

  Program outputs:

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

  B. compilation error

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

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

  Correct Answer: B

• Question 35:

  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() {

  vector v1(10,1);

  fill(v1.begin()+2, v1.end()?2,2);

  fill_n(v1.begin()+4,2,3);

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

  return 0;

  }

  Program outputs:

  A. 1 1 2 2 3 3 2 2 1 1

  B. 1 1 2 2 2 2 2 2 1 1

  C. compilation error

  D. none of these

  Correct Answer: A

• Question 36:

  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"};

  multimap m;

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

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

  }

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

  m.erase(3);

  }

  for (multimap::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 2 4 4 5 5

  E. program outputs: one two three four five

  Correct Answer: D

• Question 37:

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

  #include

  #include

  #include

  #include

  #include

  using namespace std;

  templateclass B { T val;

  public:

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

  T getV() const {return val;} };

  templateostream 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<

  string tolower(const string and s) {

  string tmp(s);

  for(unsigned i = 0; i< tmp.size(); ++i){

  tmp[i] = tolower(tmp[i]); }

  return tmp; }

  bool Less(const B anda, const B andb) { return tolower(a.getV())

  int main() {

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

  vector > v1; v1.assign(t, t+8);

  stable_sort(v1.begin(), v1.end(), Less);

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

  return 0;

  }

  Program outputs:

  A. Aaa aaa aAa aaA bbb Bbb bBb bbB

  B. Aaa aaa aAa aaA bbb Bbb bbB bBb

  C. aaa Aaa aAa aaA bbb Bbb bBb bbB

  D. the exact output is impossible to determine

  Correct Answer: C

• Question 38:

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

  #include

  #include

  #include

  using namespace std;

  int main(){

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

  string first[] = {"three", "four", "two", "one", "six","five", "seven", "nine","eight"," ten"};

  multimap m;

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

  m.insert(pair(second[i],first[i]));

  }

  if (m[11] == "eleven") {

  cout<<"eleven ";

  }

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

  cout<second<<" ";

  }

  cout<

  return 0;

  }

  A. program outputs: one two three four five six seven eight nine ten 11

  B. program outputs: one two three four five six seven eight nine ten 10

  C. program outputs: one two three four five six seven eight nine ten 10

  D. program outputs: eleven one two three four five six seven eight nine ten 10

  E. compilation error

  Correct Answer: E

• Question 39:

  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 Add {

  int operator()(int and a, int and 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(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 40:

  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, 6 , 7, 8 , 9, 10};

  vectorv1(t, t+10);

  dequed1(t, t+10);

  d1.empty();

  v1.empty();

  if (v1.isempty())

  {

  cout<<"I am empty ";

  }

  else

  {

  cout<<"I am not empty ";

  }

  cout<

  return 0;

  }

  A. program outputs: I am empty 0 0

  B. program outputs: I am not empty 0 0

  C. compilation error

  D. program outputs: I am not empty 10 10

  Correct Answer: C