Classes And Objects In C Plus Plus — Part 2 MCQs with Explanations

memory heap is the correct answer to “How to store the large objects in c++ if it extends its allocated memory”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

tfosorcim is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { string str ("microsoft"); string::reverse_iterator r; for (r = str.rbegin() ; r < str.rend(); r++ ) cout << *r; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

complex(3, 4) is the correct answer to “How to declare the complex number”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

bool operator<(Box b) { return this->capacity < b.capacity ? true : false; } is the correct answer to “Given the following C++ code. How would you define the < operator for Box class so that when boxes b1 and b2 are compared in if block the program gives correct result? #include <iostream> #include <string> using namespace std; class Box { int capacity; public: Box(){} Box(double capacity){ this->capacity = capacity; } }; int main(int argc, char const *argv[]) { Box b1(10); Box b2 = Box(14); if(b1 < b2){ cout<<"Box 2 has large capacity."; } else{ cout<<"Box 1 has large capacity."; } return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

4 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class sample { public: sample(int i) : m_i(i) { } public: int operator()(int i = 0) const { return m_i + i; } operator int () const { return m_i; } private: int m_i; friend int g(const sample&); }; int f(char c) { return c; } int main() { sample f(2); cout << f(2); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Example. is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { string str ("example."); str.front() = 'E'; cout << str << endl; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

vector is the correct answer to “Which container in c++ will take large objects”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

2 is the correct answer to “How many types of models are available to create the user-defined data type”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

call by reference is the correct answer to “Which concepts does the Pre Increment use”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

+ is the correct answer to “Which is the correct example of a binary operator”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

1511 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { string str = "HelloWorld!"; cout<<str.capacity(); cout<<str.size(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

a is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstring> using namespace std; int main(int argc, char const *argv[]) { string s("a"); cout<<s; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

|= is the correct answer to “Which of the following operator can be used to overload when that function is declared as friend function”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Error 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 argc, char const *argv[]) { char s1[6] = "Hello"; char s2[6] = "World"; char s3[12] = s1 + " " + s2; cout<<s3; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

private is the correct answer to “The data members and functions of a class in C++ are by default . . . . . . . .”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

1 is the correct answer to “How many arguments will the subscript operator will take for overloading”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Compile-time Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A { static int a; public: A() { cout<<"Object of A is created\n"; } void show() { a++; cout<<"a: "<<a<<endl; } }; class B { public: }; int main(int argc, char const *argv[]) { A a1, a2; A a3 = a1 + a2; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

55, 106, 156 is the correct answer to “#include <iostream> using namespace std; class three_d { int x, y, z; public: three_d() { x = y = z = 0; } three_d(int i, int j, int k) { x = i; y = j; z = k; } three_d operator()(three_d obj); three_d operator()(int a, int b, int c); friend ostream &operator<<(ostream &strm, three_d op); }; three_d three_d::operator()(three_d obj) { three_d temp; temp.x = (x + obj.x) / 2; temp.y = (y + obj.y) / 2; temp.z = (z + obj.z) / 2; return temp; } three_d three_d::operator()(int a, int b, int c) { three_d temp; temp.x = x + a; temp.y = y + b; temp.z = z + c; return temp; } ostream &operator<<(ostream &strm, three_d op) { strm << op.x << ", " << op.y << ", " << op.z << endl; return strm; } int main() { three_d objA(1, 2, 3), objB(10, 10, 10), objC; objC = objA(objB(100, 200, 300)); cout << objC; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

252015105 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class sample { private: int* i; int j; public: sample (int j); ~sample (); int& operator [] (int n); }; int& sample::operator [] (int n) { return i[n]; } sample::sample (int j) { i = new int [j]; j = j; } sample::~sample () { delete [] i; } int main () { sample m (5); m [0] = 25; m [1] = 20; m [2] = 15; m [3] = 10; m [4] = 5; for (int n = 0; n < 5; ++ n) cout << m [n]; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

3 is the correct answer to “How many specifiers are present in access specifiers in class”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

is the correct answer to “Which special character is used to mark the end of class”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

64 is the correct answer to “What will be the output of the following C++ code? #include <stdio.h> #include<iostream> using namespace std; int main() { int x = 5, y = 5; cout << ++x << --y << endl; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

direct member access operator is the correct answer to “How to access the object in the class”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

200 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class base { int val1, val2; public: int get() { val1 = 100; val2 = 300; } friend float mean(base ob); }; float mean(base ob) { return float(ob.val1 + ob.val2) / 2; } int main() { base obj; obj.get(); cout << mean(obj); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Error is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class complex { int i; int j; public: complex(int a, int b) { i = a; j = b; } complex operator+(complex c) { complex temp; temp.i = this->i + c.i; temp.j = this->j + c.j; return temp; } void show(){ cout<<"Complex Number: "<<i<<" + i"<<j<<endl; } }; int main(int argc, char const *argv[]) { complex c1(1,2); complex c2(3,4); complex c3 = c1 + c2; c3.show(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

0 is the correct answer to “In case of non-static member functions how many maximum object arguments a unary operator overloaded function can take”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

runtime error or random number is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class sample1 { float i, j; }; class sample2 { int x, y; public: sample2 (int a, int b) { x = a; y = b; } int result() { return x + y; } }; int main () { sample1 d; sample2 * padd; padd = (sample2*) &d; cout<< padd->result(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Hello is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstring> using namespace std; int main(int argc, char const *argv[]) { const char *a = "Hello\0World"; cout<<a; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

101010 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; class A { static int a; public: void change(int i){ a = i; } void value_of_a(){ cout<<a; } }; int A::a = 5; int main(int argc, char const *argv[]) { A a1 = A(); A a2 = A(); A a3 = A(); a1.change(10); a1.value_of_a(); a2.value_of_a(); a3.value_of_a(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

all of the mentioned is the correct answer to “Inline functions are avoided when . . . . . . . .”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

rect area: 12 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class rect { int x, y; public: void val (int, int); int area () { return (x * y); } }; void rect::val (int a, int b) { x = a; y = b; } int main () { rect rect; rect.val (3, 4); cout << "rect area: " << rect.area(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

A function which can access all the private, protected and public members of a class is the correct answer to “What is a friend function in C++”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

Volume of Box1 : 210 Volume of Box2 : 1560 Volume of Box3 : 5400 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; class Box { double length; double breadth; double height; public: double getVolume(void) { return length * breadth * height; } void setLength( double len ) { length = len; } void setBreadth( double bre ) { breadth = bre; } void setHeight( double hei ) { height = hei; } Box operator+(const Box& b) { Box box; box.length = this->length + b.length; box.breadth = this->breadth + b.breadth; box.height = this->height + b.height; return box; } }; int main( ) { Box Box1; Box Box2; Box Box3; double volume = 0.0; Box1.setLength(6.0); Box1.setBreadth(7.0); Box1.setHeight(5.0); Box2.setLength(12.0); Box2.setBreadth(13.0); Box2.setHeight(10.0); volume = Box1.getVolume(); cout << "Volume of Box1 : " << volume <<endl; volume = Box2.getVolume(); cout << "Volume of Box2 : " << volume <<endl; Box3 = Box1 + Box2; volume = Box3.getVolume(); cout << "Volume of Box3 : " << volume <<endl; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

operator sign is the correct answer to “How to declare operator function”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

15 9223372036854770000 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <string> using namespace std; int main () { string str ("Ubuntu"); cout << str.capacity(); cout << str.max_size(); return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

It makes the object "callable" like a function is the correct answer to “What is the use of functor”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

2614 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; void duplicate (int& a, int& b, int& c) { a *= 2; b *= 2; c *= 2; } int main () { int x = 1, y = 3, z = 7; duplicate (x, y, z); cout << x << y << z; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

50 is the correct answer to “What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { int a = 20; int b = 10; int c = 15; int d = 5; int e; e = a + b * c / d; cout << e << endl ; return 0; }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

dereference is the correct answer to “Which is used to tell the computer that where a pointer is pointing to”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.

5 5 is the correct answer to “What will be the output of the following C++ code? #include <iostream> #include <cmath> using namespace std; class Complex { private: double real; double imag; public: Complex(double r = 0.0, double i = 0.0) : real(r), imag(i) {} double mag() { return getMag(); } operator double () { return getMag(); } private: double getMag() { return sqrt(real * real + imag * imag); } }; int main() { Complex com(3.0, 4.0); cout << com.mag(); cout << com; return 0 }”. This question is standard in competitive examination syllabi for Classes And Objects In C Plus Plus.