Pointers and References in C++ MCQ question and answer with solution

31.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    int  const  p = 5;
    cout << ++p;
    return 0;
}

A. 5

B. 6

C. Error

D. 8

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32.
What we can't do on a void pointer?

A. pointer arithmetic

B. pointer functions

C. pointer objects

D. pointer functions & objects

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33.

Choose the right option.

string* x, y;

A. x is a pointer to a string, y is a string

B. y is a pointer to a string, x is a string

C. both x and y are pointers to string types

D. y is a pointer to a string

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34.
What is size of generic pointer in C++ (in 32-bit platform)?

A. 2

B. 4

C. 8

D. 0

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35.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    int n = 5;
    void *p = &n;
    int *pi = static_cast<int*>(p);
    cout << *pi << endl;
    return 0;
}

A. 5

B. 6

C. compile time error

D. runtime error

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36.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
int main(int argc, char const *argv[])
{
	int a = 5;
	int &p = a;
	cout<<p;
	return 0;
}

A. 5

B. Run-time error

C. Segmentation fault

D. Compile-time error

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37.
The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is . . . . . . . .

A. int **fun(float**, char**)

B. int *fun(float*, char*)

C. int **fun(float*, char**)

D. int ***fun(*float, **char)

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38.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
void print (char * a)
{
    cout << a << endl;
}
int main ()
{
    const char * a = "Hello world";
    print(const_cast (a) );
    return 0;
}

A. Hello world

B. Hello

C. world

D. compile time error

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39.
Identify the incorrect statement.

A. Reference is the alternate name of the object

B. A reference value once defined can be reassigned

C. A reference value once defined cannot be reassigned

D. Reference is the alternate name of the variable

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40.
Which of the following function must use reference.

A. Assignment operator function

B. Copy Constructor

C. Destructor

D. Parameterized constructor

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31.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { int const p = 5; cout << ++p; return 0; }`

Answer & Solution

32.
What we can't do on a void pointer?

Answer & Solution

33.
Choose the right option.

`string* x, y;`

Answer & Solution

34.
What is size of generic pointer in C++ (in 32-bit platform)?

Answer & Solution

35.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { int n = 5; void p = &n; int pi = static_cast<int>(p); cout << pi << endl; return 0; }`

Answer & Solution

36.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const *argv[]) { int a = 5; int &p = a; cout<<p; return 0; }`

Answer & Solution

37.
The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is . . . . . . . .

Answer & Solution

38.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; void print (char * a) { cout << a << endl; } int main () { const char * a = "Hello world"; print(const_cast (a) ); return 0; }`

Answer & Solution

39.
Identify the incorrect statement.

Answer & Solution

40.
Which of the following function must use reference.

Answer & Solution

Pointers and References in C++ MCQ question and answer with solution | C++ Programimg MCQs

31. What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { int const p = 5; cout << ++p; return 0; }

Answer & Solution

32. What we can't do on a void pointer?

Answer & Solution

33. Choose the right option. string* x, y;

Answer & Solution

34. What is size of generic pointer in C++ (in 32-bit platform)?

Answer & Solution

35. What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { int n = 5; void *p = &n; int *pi = static_cast<int*>(p); cout << *pi << endl; return 0; }

Answer & Solution

36. What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const *argv[]) { int a = 5; int &p = a; cout<<p; return 0; }

Answer & Solution

37. The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is . . . . . . . .

Answer & Solution

38. What will be the output of the following C++ code? #include <iostream> using namespace std; void print (char * a) { cout << a << endl; } int main () { const char * a = "Hello world"; print(const_cast (a) ); return 0; }

Answer & Solution

39. Identify the incorrect statement.

Answer & Solution

40. Which of the following function must use reference.

Answer & Solution

31.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { int const p = 5; cout << ++p; return 0; }`

32.
What we can't do on a void pointer?

33.
Choose the right option.

`string* x, y;`

34.
What is size of generic pointer in C++ (in 32-bit platform)?

35.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { int n = 5; void p = &n; int pi = static_cast<int>(p); cout << pi << endl; return 0; }`

36.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const *argv[]) { int a = 5; int &p = a; cout<<p; return 0; }`

37.
The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is . . . . . . . .

38.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; void print (char * a) { cout << a << endl; } int main () { const char * a = "Hello world"; print(const_cast (a) ); return 0; }`

39.
Identify the incorrect statement.

40.
Which of the following function must use reference.