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

• Question 1:

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

  #include

  #include

  #include

  using namespace std;

  int main(){

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

  vectorv(myints, myints+10);

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

  set > s2(v.begin(), v.end());

  for(set::iterator i=s1.begin();i!= s1.end(); i++) {

  cout<<*i<<" ";

  }

  for(set >::iterator i=s2.begin();i!= s2.end(); i++) {

  cout<<*i<<" ";

  }

  cout<

  return 0;

  }

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

  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: 0 1 2 3 4 5 6 7 8 9 9 8 7 6 5 4 3 2 1 0

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

  Correct Answer: C

• Question 2:

  What will happen 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);

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

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

  pair::iterator,set::iterator> range;

  range = s1.equal_range(6);

  cout<<*range.first<<" "<<*range.second<

  return 0;

  }

  The output will be:

  A. 6 6

  B. 5 7

  C. 6 7

  D. 1 5

  E. 6 5

  Correct Answer: C

• Question 3:

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

  #include

  #include

  #include

  using namespace std;

  void print(int v) { cout<

  struct Sequence {

  int start;

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

  int operator()() {

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

  }

  };

  int main() {

  vector v1(10);

  generate_n(v1.begin(), 10, Sequence(1));

  remove(v1.begin(), v1.end(), 10);

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

  return 0;

  }

  Program outputs:

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

  B. 20 30 20 30 20 30 20

  C. 20 30 20 30 20 30 20 30 10 20

  D. compilation error

  Correct Answer: C

• Question 4:

  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(1,Add()));

  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 5:

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

  #include

  #include

  using namespace std;

  template

  class A {

  T_v;

  public:

  A() {}

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

  T getV() { return _v; }

  void add(T and a);

  void add(string and a);

  };

  template

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

  void A::add(string and a) {

  _v.insert(0, a);

  }

  int main()

  {

  Aa("Hello");

  string s(" world!");

  a.add(s);

  cout << a.getV() <

  return 0;

  }

  A. program will display: Hello world!

  B. compilation error

  C. program will display: world!Hello

  D. program will run without any output

  Correct Answer: B

• Question 6:

  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 };

  multiset s1(t,t+10);

  s1.insert(s1.find(7), 3);

  for(multiset::iterator i=s1.begin();i!= s1.end(); i++) {

  cout<<*i<<" ";

  }

  return 0;

  }

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

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

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

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

  E. runtime exception

  Correct Answer: A

• Question 7:

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

  #include

  #include

  #include

  using namespace std;

  template

  int calculate(T start, T end)

  {

  int s = 0;

  while (start != end)

  s+= *start; start++;return s;

  }

  int main ()

  {

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

  vectorv1(t, t+5);

  dequed1(t+5, t+10);

  cout<

  cout<

  cout<

  cout<

  cout<

  return 0;

  }

  A. compilation error

  B. runtime exception

  C. program outputs 55 5 17 55

  D. program outputs 55 5 17 0

  Correct Answer: A

• Question 8:

  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++; }

  };

  struct Odd { bool operator()(int v) { return v%2==0; } };

  int main() {

  vector v1(10);

  vector v2(10);

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

  stable_partition(v1.begin(),v1.end(), Odd());

  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. 5 7 3 9 1 10 2 8 4 6

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

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

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

  Correct Answer: E

• Question 9:

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

  #include

  using namespace std;

  int main()

  {

  cout.setf(ios::oct, ios::basefield);

  cout<<100<<" ";

  cout.setf(ios::showbase);

  cout<<100<<" ";

  return 0;

  }

  Program outputs:

  A. 144 0144

  B. 144 0x64

  C. 0x144 0144

  D. 0144 100

  E. compilation error

  Correct Answer: A

• Question 10:

  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;

  getline(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: B