Pointers into Arrays C++ MCQ

1. 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.

Answer:b

2. What is size of generic pointer in c?
a) 0
b) 1
c) 2
d) Null

Answer:c

3. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main()

4.    {

5.        int a[2][4] = {3, 6, 9, 12, 15, 18, 21, 24};

6.        cout << *(a[1] + 2) << *(*(a + 1) + 2) << 2[1[a]];

7.        return 0;

8.    }

a) 15 18 21
b) 21 21 21
c) 24 24 24
d) Compile time error

Answer:b

4. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main()

4.    {

5.        int i;

6.        char *arr[] = {"C", "C++", "Java", "VBA"};

7.        char *(*ptr)[4] = &arr;

8.        cout << ++(*ptr)[2];

9.        return 0;

10.    }

a) ava
b) java
c) c++
d) compile time error

Answer:a

5. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main()

4.    {

5.        int arr[] = {4, 5, 6, 7};

6.        int *p = (arr + 1);

7.        cout << *p;

8.        return 0;

9.    }

a) 4
b) 5
c) 6
d) 7

Answer:b

6. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main()

4.    {

5.        int arr[] = {4, 5, 6, 7};

6.        int *p = (arr + 1);

7.        cout << arr;

8.        return 0;

9.    }

a) 4
b) 5
c) address of arr
d) 7

Answer:c

7. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main ()

4.    {

5.        int numbers[5];

6.        int * p;

7.        p = numbers;  *p = 10;

8.        p++;  *p = 20;

9.        p = &numbers[2];  *p = 30;

10.        p = numbers + 3;  *p = 40;

11.        p = numbers;  *(p + 4) = 50;

12.        for (int n = 0; n < 5; n++)

13.            cout << numbers[n] << ",";

14.        return 0;

15.    }

a) 10, 20, 30, 40, 50
b) 1020304050
c) compile error
d) runtime error

Answer:a

8. What is the output of this program?

1.    #include <iostream>

2.    using namespace std;

3.    int main()

4.    {

5.         int arr[] = {4, 5, 6, 7};

6.         int *p = (arr + 1);

7.         cout << *arr + 9;

8.         return 0;

9.    }

a) 12
b) 5
c) 13
d) error

Answer:c