Pointers C++ MCQ

1. 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

Answer:c

2. The operator used for dereferencing or indirection is ____
a) *
b) &
c) ->
d) –>>

Answer:a

3. 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 mentioned

Answer:a

4. 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 tye

Answer:d

5. Which of the following is illegal?
a) int *ip;
b) string s, *sp = 0;
c) int i; double* dp = &i;
d) int *pi = 0;

Answer:c

6. 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

Answer:b

7. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main()

4.     {

5.         int a = 5, b = 10, c = 15;

6.         int *arr[ ] = {&a, &b, &c};

7.         cout << arr[1];

8.         return 0;

9.     }

a) 5
b) 10
c) 15
d) it will return some random number

Answer:d

8. 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)

Answer:c

9. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main()

4.     {

5.         char arr[20];

6.         int i;

7.         for(i = 0; i < 10; i++)

8.             *(arr + i) = 65 + i;

9.         *(arr + i) = '\0';

10.         cout << arr;

11.         return(0);

12.     }

a) ABCDEFGHIJ
b) AAAAAAAAAA
c) JJJJJJJJ
d) none of the mentioned

Answer:a

10. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main()

4.     {

5.         char *ptr;

6.         char Str[] = "abcdefg";

7.         ptr = Str;

8.         ptr += 5;

9.         cout << ptr;

10.         return 0;

11.     }

a) fg
b) cdef
c) defg
d) abcd

Answer:a