C++ this Pointer Aptitude Questions and Answers

1) There are the following statements that are given below, which of them are correct about "this" keyword in C++?

1. In C++, "this" is a pointer that is used to point virtual functions.
2. In C++, "this" is a pointer that contains the reference of the current object.
3. In C++, "this" pointer can be used within the class only.
4. In C++, "this" pointer can be used inside as well as outside the class.

Options:

1. A and C
2. B and C
3. A, B and D
4. A, B, and C

2) Can we pass the reference of the current object using "this" pointer?

1. Yes
2. No

3) Can we call member function in a cascaded manner using "this" pointer?

1. Yes
2. No

4) What is the correct output of the given code snippets?

#include <iostream>
using namespace std;

class Sample {
    int VAL;

public:
    Sample(int VAL)
    {
        VAL = this.VAL;
    }
    void Print()
    {
        cout << VAL;
    }
};

int main()
{
    Sample S(10);

    S.Print();
}

Options:

1. 10
2. Garbage value
3. Syntax error
4. Runtime error

5) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
    int VAL;

public:
    Sample(int VAL)
    {
        VAL = this->VAL;
    }
    void Print()
    {
        cout << VAL;
    }
};

int main()
{
    Sample S(10);

    S.Print();
}

Options:

1. 10
2. Garbage value
3. Syntax error
4. Runtime error

6) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
    int VAL;

public:
    Sample(int VAL)
    {
        this->VAL = VAL;
    }
    void Print()
    {
        cout << VAL;
    }
};

int main()
{
    Sample S(10);

    S.Print();
}

Options:

1. 10
2. Garbage value
3. Syntax error
4. Runtime error

7) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
    int VAL;

public:
    Sample()
    {
        this->VAL = 0;
    }

    Sample(int VAL)
    {
        this->VAL = VAL;
    }

    Sample Sum(Sample S1, Sample S2)
    {
        this->VAL = S1.VAL + S2.VAL;

        return this;
    }

    void Print()
    {
        cout << VAL << " ";
    }
};

int main()
{
    Sample S1(10);
    Sample S2(20);

    Sample S3;

    Sample S4;

    S4 = S3.Sum(S1, S2);

    S1.Print();
    S2.Print();
    S3.Print();
    S4.Print();
}

Options:

1. 10 20 30 30
2. 10 20 0 30
3. Syntax error
4. Runtime error

8) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
    int VAL;

public:
    Sample()
    {
        this->VAL = 0;
    }

    Sample(int VAL)
    {
        this->VAL = VAL;
    }

    Sample Sum(Sample S1, Sample S2)
    {
        this->VAL = S1.VAL + S2.VAL;

        return *this;
    }

    void Print()
    {
        cout << VAL << " ";
    }
};

int main()
{
    Sample S1(10);
    Sample S2(20);

    Sample S3;

    Sample S4;

    S4 = S3.Sum(S1, S2);

    S1.Print();
    S2.Print();
    S3.Print();
    S4.Print();
}

Options:

1. 10 20 30 30
2. 10 20 0 30
3. Syntax error
4. Runtime error

9) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
public:
    Sample* fun1()
    {
        cout << "fun1 ";
        return this;
    }
    Sample* fun2()
    {
        cout << "fun2 ";
        return this;
    }
    Sample* fun3()
    {
        cout << "fun3 ";
        return this;
    }
};

int main()
{
    Sample S;

    S->fun1()->fun2()->fun3();
}

Options:

1. fun1 fun2 fun3
2. Syntax error
3. Runtime error
4. Garbage value

10) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

class Sample {
public:
    Sample fun1()
    {
        cout << "fun1 ";
        return *this;
    }
    Sample fun2()
    {
        cout << "fun2 ";
        return *this;
    }
    Sample fun3()
    {
        cout << "fun3 ";
        return *this;
    }
};

int main()
{
    Sample S;

    S.fun1().fun2().fun3();
}

Options:

1. fun1 fun2 fun3
2. Syntax error
3. Runtime error
4. Garbage value