C++ MCQs with answers Page - 102

#include<iostream>
using namespace std;

class Point {
private:
    int x;
    int y;
public:
    Point(int a = 0, int b = 0);    // Normal constructor
    Point(const Point &p); // Copy Constructor
}; 

Point::Point(int a, int b)  {
    x = a;
    y = b;
    cout << "Normal constructor called
";
}

Point::Point(const Point &p) {
   x = p.x;
   y = p.y;
   cout << "Copy constructor called
";
}

int main()
{
   Point *p1, *p2;
   p1 = new Point(5, 10);
   p2 = new Point(*p1);
   Point p3 = *p1;
   Point p4;
   p4 = p3;
   return 0;
}

#include<iostream> 
using namespace std; 
  
class MyClass { 
    int val; 
public: 
    MyClass(int v); 
}; 
  
MyClass::MyClass(int v) { 
    val = v; 
    cout << "Constructor called
";
} 
  
int main() { 
    MyClass arr[100]; 
    return 0; 
}

#include<iostream> 
using namespace std;
int &f() {
  static int x = 10;
  return x;
}

int main() {
  int &y = f();
  y = y +5;
  cout << f();
  return 0;
}

#include <iostream>
using namespace std;
 
class A
{
  static int val;
 
   public:
  void write(int i){
    val = i;
  }
  void read(){
    cout << val;
  }
};
 
int main(int argc, char const *argv[])
{
  A a = A();
  a.write(10);
  a.read();
  return 0;
}

#include <iostream>
using namespace std;
 
class A
{
  static int val;
 
   public:
  void write(int i){
    val = i;
  }
  void read(){
    cout << val;
  }
};

int A::val = 55;

int main(int argc, char const *argv[])
{
  A a = A();
  a.write(10);
  a.read();
  return 0;
}