C++ Programming Multiple Choice Question - Pointers

This section focuses on the "Pointers" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Which of the following is the correct way to declare a pointer ?

A. int *ptr
B. int ptr
C. int &ptr
D. All of the above

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2. Which of the following gives the [value] stored at the address pointed to by the pointer : ptr?

A. Value(ptr)
B. ptr
C. &ptr
D. *ptr

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3. A pointer can be initialized with

A. Null
B. Zero
C. Address of an object of same type
D. All of the above

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4. 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. none of the above

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5. Generic pointers can be declared with__________ .

A. auto
B. void
C. asm
D. None of the above

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6. What is size of generic pointer in c?

A. 0
B. 1
C. 2
D. Null

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7. Which from the following is not a correct way to pass a pointer to a function?

A. Non-constant pointer to non-constant data
B. A non-constant pointer to constant data
C. A constant pointer to non-constant data
D. All of the above

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8. What does the following statement mean? 

 int (*fp)(char*)

A. Pointer to a pointer
B. Pointer to an array of chars
C. Pointer to function taking a char* argument and returns an int
D. Function taking a char* argument and returning a pointer to int

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9. A void pointer cannot point to which of these?

A. Methods in c++
B. Class member in c++
C. Both A & B
D. None of the above

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10. Referencing a value through a pointer is called

A. Direct calling
B. Indirection
C. Pointer referencing
D. All of the above

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11. What is the output of this program?

#include <iostream>
using namespace std;

int main()
    {
        int x = 1, y = 3, z = 5;
        int *lfc[ ] = {&x, &y, &z};
        cout << lfc[1];
        return 0;
    }

A. 1
B. 3
C. 5
D. it will return some random number

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12. What is the output of this program?

#include <iostream>

using namespace std;
int main()
{
    char lfc[20];
    int i;
    for(i = 0; i < 10; i++)
        *(lfc + i) = 65 + i;
    *(lfc + i) = ' ';
    cout << lfc;
    return(0);   
}

A. ABCDEFGHIJ
B. AAAAAAAAAA
C. JJJJJJJJ
D. None of the mentioned

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13. What is the output of this program?

#include <iostream>

using namespace std;
int main()
{
    char *ptr;
    char Str[] = "abcdefg";
    ptr = Str;
    ptr += 5;
    cout << ptr;
    return 0;

}

A. fg
B. cdef
C. defg
D. abcd

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14. Which of the following statement is correct about the program given below?

        
Note:Includes all required header files

 using namespace std;
   int main()
   {
       int a[2][4] = {1, 2, 3, 4, 5, 6, 7, 8};
       cout << *(a[1] + 2) << *(*(a + 1) + 2) << 2[1[a]];
       return 0;
   }

A. 5 6 7
B. 7 7 7
C. 8 8 8
D. Compile time error

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15. Which of the following is true about the following program

#include <iostream>

using namespace std;
int main()
{
   int i;
   char *lfc[] = {"C", "C++", "Java", "VBA"};
   char *(*ptr)[4] = &lfc;
   cout << ++(*ptr)[2];
   return 0;
}

A. ava
B. java
C. c++
D. compile time error

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16. What will be the output of this program?

        
Note:Includes all required header files

using namespace std;
   int main()
   {
       int find[] = {1, 2, 3, 4};
       int *p = (find + 1);
       cout << *p;
       return 0;
   }

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

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17. What will be the output of this program?

        
Note:Includes all required header files
using namespace std;
   int main()
   {
       int find[] = {1, 2, 3, 4};
       int *p = (find + 1);
       cout << find;
       return 0;
   }

A. 1
B. 2
C. address of find
D. 4

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18. What will be the output of the following program?

       
Note:Includes all required header files

using namespace std;
   int main()
   {
        int find[] = {1, 2, 3, 4};
        int *p = (find + 1);
        cout << *find + 9;
        return 0;
   }

A. 9
B. 10
C. 11
D. error

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19. What will be the output of the following program?

        
Note:Includes all required header files

using namespace std; 

   int main ()
   {
       int find[5];
       int * p;
       p = find;  *p = 1;
       p++;  *p = 2;
       p = &find[2];  *p = 3;
       p = find + 3;  *p = 4;
       p = find;  *(p + 4) = 5;
       for (int n = 0; n < 5; n++)
           cout << find[n] << ",";
       return 0;
   }

A. 1,2,3,4,5,
B. 12345
C. compile error
D. runtime error

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20. 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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21. The pointer can point to any variable that is not declared with which of these?

A. Const
B. Volatile
C. Both A & B
D. Static

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22. Which operator returns the address of unallocated blocks in memory?

A. The delete operator
B. The empty operator
C. The new operator
D. All of them

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23. Which of the following is illegal?

A. int *ip;
B. string s, *sp = 0;
C. int i; double* dp = &i
D. int *pi = 0;

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24. Which one of the following is not a possible state for a pointer?

A. Hold the address of the specific object
B. Point one past the end of an object
C. Zero
D. Point to a type

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25. A pointer contains __________.

A. Address of a variable
B. Name of the variable
C. Value of the variable
D. None of the above

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26. Which of the following are not a member dereferencing operators in CPP? 1. * 2. :: 3. ->* 4. ::* 5. ->

A. Only 1, 2, 4
B. Only 1 and 5
C. Only 2 and 5
D. Only 3,4,5

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27. What is meaning of following declaration?

int(*p[5])();

A. p is pointer to function.
B. p is array of pointer to function
C. p is pointer to such function which return type is array.
D. p is pointer to array of function.

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28. What will happen in this code?

int a = 100, b = 200;
int *p = &a, *q = &b
p = q;

A. b is assigned to a
B. p now points to b
C. a is assigned to b
D. q now points to a

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29. 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 pointer to string types
D. None of the above

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30. Which is true for b, if b is defined as "int *b[10];"?

A. The definition only allocates 10 pointers and does not initialize them
B. Initialization must be done explicitly
C. The definition only allocates 10 pointers and does not initialize them & Initialization must be done explicitly
D. Error

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