C Plus Plus Miscellaneous — Part 2 MCQs with Explanations

3 is the correct answer to “How many kinds of parameters are there in C++”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

160 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <functional> #include <numeric> using namespace std; int myfunction (int x, int y) { return x + 2 * y; } struct myclass { int operator()(int x, int y) { return x + 3 * y; } } myobject; int main () { int init = 100; int numbers[] = {10, 20, 30}; cout << accumulate(numbers, numbers + 3, init); cout << endl; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

cin is the correct answer to “Which is used to get the input during runtime”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Function which does not have definition of its own is the correct answer to “What is meant by pure virtual function”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

1210 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class poly { protected: int width, height; public: void set_values(int a, int b) { width = a; height = b; } }; class Coutput { public: void output(int i); }; void Coutput::output(int i) { cout << i; } class rect:public poly, public Coutput { public: int area() { return(width * height); } }; class tri:public poly, public Coutput { public: int area() { return(width * height / 2); } }; int main() { rect rect; tri trgl; rect.set_values(3, 4); trgl.set_values(4, 5); rect.output(rect.area()); trgl.output(trgl.area()); return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

2 is the correct answer to “How many types of sequence operations are provided by the C++ algorithm STL”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

steve jobs is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <memory> #include <string> using namespace std; int main () { string numbers[] = {"steve", "jobs"}; pair <string*, ptrdiff_t> result = get_temporary_buffer<string>(2); if (result.second>0) { uninitialized_copy ( numbers, numbers + result.second, result.first ); for (int i = 0; i < result.second; i++) cout << result.first[i] << " "; return_temporary_buffer(result.first); } return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Uni-directional is the correct answer to “What kind of iteration does forward_list provide in C++”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

<vector> is the correct answer to “Which of the following header file is needed to use vectors in your program”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

returns all the combination of ter is the correct answer to “What will be the output of the following C++ code? #include <string> #include <iostream> using namespace std; void string_permutation( string& orig, string& perm ) { if (orig.empty()) { cout<<perm<<endl; return; } for (int i = 0; i < orig.size(); ++i) { string orig2 = orig; orig2.erase(i, 1); string perm2 = perm; perm2 += orig.at(i); string_permutation(orig2, perm2); } } int main() { string orig = "ter"; string perm; string_permutation(orig, perm); return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Node-based is the correct answer to “What type of class template is list”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

vector<int> values (5) is the correct answer to “Pick out the correct statement about vector.”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

inheriting and overriding exception class functionality is the correct answer to “How do define the user-defined exceptions”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

7 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <vector> using namespace std; int main () { vector<int> first; first.assign (7,100); vector<int>::iterator it; it=first.begin()+1; int myints[] = {1776,7,4}; cout << int (first.size()) << '\n'; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

1 2 3 4 5 3 4 5 0 0 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <Valarray> using namespace std; int main() { Valarray<int> varr = { 1, 2, 3, 4, 5 }; for (int &x: varr) cout << x << " "; cout<<endl; varr = varr.shift(2); for (int &x: varr) cout << x << " "; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

terminate is the correct answer to “What function will be called when we have an uncaught exception”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

1 2 3 4 5 1 2 3 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <vector> #include <forward_list> using namespace std; int main() { forward_list<int> fl1 = {1,2,3,4,5}; for (int&c : fl1) cout << c << " "; cout<<endl; fl1.remove_if([](int x){ return x > 3;}); for (int&c : fl1) cout << c << " "; cout<<endl; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Sum of array: 63 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <valarray> using namespace std; int main() { valarray<int> varr = { 10, 2, 20, 1, 30 }; cout<<"Sum of array: "<<varr.sum(); return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

1342 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class Base { public: Base ( ) { cout << "1" << endl; } ~Base ( ) { cout << "2" << endl; } }; class Derived : public Base { public: Derived ( ) { cout << "3" << endl; } ~Derived ( ) { cout << "4" << endl; } }; int main( ) { Derived x; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

11111000 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <bitset> using namespace std; int main() { bitset<8> b1(95); bitset<8> b2 = b1 << 3; cout<<b2; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Portability is the correct answer to “What is the main feature of locale in C++”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

decreasing order is the correct answer to “Elements in STL heap are removed in . . . . . . . .”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

4 1 2 3 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <algorithm> #include <vector> using namespace std; int main () { vector<int> myvector; for (int i = 1; i < 5; ++i) myvector.push_back(i); rotate(myvector.begin(), myvector.begin() + 3, myvector.end( )); for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it) cout << ' ' << *it; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Arguments passed to main() function is the correct answer to “What are command line arguments”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

2 or 3 is the correct answer to “How many parameters are there in getline function”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Both Aggregation and Composition is the correct answer to “Which of the following relationships is uni-directional”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

compile time error is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { int a = 10; if (a < 15) { time: cout << a; goto time; } break; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

=0 is the correct answer to “Which is used to create a pure virtual function”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Wrong number used is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { int num = 3; string str_bad = "wrong number used"; try { if ( num == 1 ) { throw 5; } if ( num == 2 ) { throw 1.1f; } if ( num != 1 || num != 2 ) { throw str_bad; } } catch (int a) { cout << "Exception is: " << a << endl; } catch (float b) { cout << "Exception is: " << b << endl; } catch (...) { cout << str_bad << endl; } return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

push_back() is the correct answer to “Which of the following function is used to insert an element at the end of a vector”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

Objects that can hold more than one element of different types is the correct answer to “What are the tuples in C++”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

2 is the correct answer to “How many ways of reusing are there in the class hierarchy”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

<limits> is the correct answer to “Which header file is used for the numeric limits in C++”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

(6, a, Hello) (9, z, World) (9, z, World) (6, a, Hello) is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> #include <tuple> using namespace std; int main() { tuple <int, char, string> tp1; tuple <int, char, string> tp2; tp1 = make_tuple(6, 'a', "Hello"); tp2 = make_tuple(9, 'z', "World"); cout<<"("<<get<0>(tp1)<<", "<<get<1>(tp1)<<", "<<get<2>(tp1)<<")"<<endl; cout<<"("<<get<0>(tp2)<<", "<<get<1>(tp2)<<", "<<get<2>(tp2)<<")"<<endl; tp1.swap(tp2); cout<<"("<<get<0>(tp1)<<", "<<get<1>(tp1)<<", "<<get<2>(tp1)<<")"<<endl; cout<<"("<<get<0>(tp2)<<", "<<get<1>(tp2)<<", "<<get<2>(tp2)<<")"<<endl; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

355 535 553 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <vector> #include <algorithm> using namespace std; void show(const vector<int>& vi) { for (size_t i = 0; i < vi.size(); ++i) cout << vi[i]; cout << endl; } int main() { vector<int> vi; vi.push_back(3); vi.push_back(5); vi.push_back(5); sort(vi.begin(), vi.end()); show(vi); while(next_permutation(vi.begin(), vi.end())) show(vi); return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

3 is the correct answer to “In how many different ways any-container can be constructed”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

A function taking a single generic parameter and returning a generic type which may be different from argument type is the correct answer to “What does this template function indicates? ================== template<class T, class U> U func(T a, U b) { cout<<a<<"\t"<<b; } ==================”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

found. is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <algorithm> #include <vector> using namespace std; int main () { vector<int> v = {4,2,10,5,1,8}; sort(v.begin(), v.end()); if (binary_search(v.begin(), v.end(), 4)) cout << "found.\n"; else cout << "not found.\n"; return 0; }”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

A function can throw an exception of certain type only is the correct answer to “Identify the correct statement about throw(type).”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.

ellipses operator is the correct answer to “Which operator is used as catch-all handler”. This question is standard in competitive examination syllabi for C Plus Plus Miscellaneous.