Predict output of the following program C #include <stdio.h> int main() { printf(" ew_c_question b "); printf("geeksforgeeks"); getchar(); return 0; }

Depends on terminal configuration

What is the output of following program? CPP #include <iostream> using namespace std; class Point { int x, y; public: Point(const Point &p) { x = p.x; y = p.y; } int getX() { return x; } int getY() { return y; } }; int main() { Point p1; Point p2 = p1; cout << "x = " << p2.getX() << " y = " << p2.getY(); return 0; }

x = garbage value y = garbage value

C++ Constructors

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Question 1

When a copy constructor may be called?

A
When an object of the class is returned by value.
B
When an object of the class is passed (to a function) by value as an argument.
C
When an object is constructed based on another object of the same class
D
When compiler generates a temporary object.
E
All of the above

Question 2

Predict output of the following program

#include <stdio.h>
int main()
{
   printf("\new_c_question\b\r");
   printf("geeksforgeeks"); 
   getchar();
   return 0;
}

A
ew_c_question
geeksforgeeks
B
new_c_ques
geeksforgeeks
C

geeksforgeeks
D
Depends on terminal configuration

Question 3

Output of following program?

C++

#include <iostream>
using namespace std;

class Point {
    Point() { cout << "Constructor called"; }
};

int main()
{
    Point t1;
    return 0;
}

A
Runtime Error
B
None of these
C
Constructor called
D
Compiler Error

Question 4

Output of following C++ code will be?

C++

#include <iostream>
using namespace std;

class X 
{
public:
    int x;
};

int main()
{
    X a = {10};
    X b = a;
    cout << a.x << " " << b.x;
    return 0;
}

A
Compiler Error
B
10 followed by Garbage Value
C
10 10
D
10 0

Question 5

Predict the output of the following program:

C++

#include <iostream>
using namespace std;

class GfG {
    public:
    int val;
    
    GfG(): val(11) {}
    GfG(int x): val(x) {};
    GfG(const GfG& other): GfG(other.val) {}
};

int main() {
    GfG gfg1(22);
    GfG gfg2(gfg1);
    cout << gfg2.val;
    return 0;
}

A
0
B
22
C
Compiler Error
D
11

Question 6

What is the output of following program?

CPP

#include <iostream>
using namespace std;

class Point
{
    int x, y;
public:
   Point(const Point &p) { x = p.x; y = p.y; }
   int getX() { return x; }
   int getY() { return y; }
};

int main()
{
    Point p1;
    Point p2 = p1;
    cout << "x = " << p2.getX() << " y = " << p2.getY();
    return 0;
}

A
x = garbage value y = garbage value
B
x = 0 y = 0
C
Compiler Error

Question 7

Predict the output of the following program:

C++

#include <iostream>
using namespace std;

class GfG {
    public:
    int val;
    
    GfG(int x = 22) {
        this->val = x;
    }
};

int main() {
    GfG gfg;
    cout << gfg.val;
    return 0;
}

A
0
B
22
C
Runtime Error
D
Compiler Error

Question 8

Predict the output of the following program?

C++

#include <iostream>
using namespace std;

class GfG {
    GfG() {
        cout << "Constructor Called" << endl;
    }
};

int main() {
    cout << "Main Started" << endl;
    return 0;
}

A
Compiler Error
B
Main Started
Constructor Called
C
Constructor Called
Main Started
D
Main Started

Question 9

Implicit return type of a class constructor is:

A
not of class type itself
B
class type itself
C
a destructor of class type
D
a destructor not of class type

Question 10

We must use initializer list in a constructor when

A
There is a reference variable in class
B
There is a constant variable in class
C
There is an object of another class. And the other class doesn't have default constructor.
D
All of the above

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