C++ Programming

POINTERS INTO ARRAYS MCQs

Total Questions : 8

Question 1.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
int arr[] = {4, 5, 6, 7};
6.
int *p = (arr + 1);
7.
cout
  1.    12
  2.    5
  3.    13
  4.    error
 Discuss Question
Answer is Option C. -> 13

In this program, we are adding the value 9 to the initial value of the array, So it’s printing as 13.
Output:
$ g++ point5.cpp
$ a.out
13

Question 2.


What is the output of this program?



1.
#include
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
  1.    10,20,30,40,50,
  2.    1020304050
  3.    compile error
  4.    runtime error
 Discuss Question
Answer is Option A. -> 10,20,30,40,50,

In this program, we are just assigning a value to the array and printing it and immediately dereferencing it.
Output:
$ g++ point4.cpp
$ a.out
10,20,30,40,50,

Question 3.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
int arr[] = {4, 5, 6, 7};
6.
int *p = (arr + 1);
7.
cout
  1.    4
  2.    5
  3.    address of arr
  4.    7
 Discuss Question
Answer is Option C. -> address of arr

As we couted to print only arr, it will print the address of the array.
Output:
$ g++ point2.cpp
$ a.out
0xbfb1cff

Question 4.


what is the output of this program?



1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
int arr[] = {4, 5, 6, 7};
6.
int *p = (arr + 1);
7.
cout
  1.    4
  2.    5
  3.    6
  4.    7
 Discuss Question
Answer is Option B. -> 5

In this program, we are making the pointer point to next value and printing it.
$ g++ point3.cpp
$ a.out
5

Question 5.


What is the output of this program?



1.
#include
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
  1.    ava
  2.    java
  3.    c++
  4.    compile time error
 Discuss Question
Answer is Option A. -> ava

In this program we are moving the pointer from first position to second position and printing the 

remaining value.
Output:
$ g++ point1.cpp
$ a.out
ava

Question 6.

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


  1.    2
  2.    4
  3.    8
  4.    0
 Discuss Question
Answer is Option B. -> 4

Size of any type of pointer is 4 bytes in 32-bit platforms.

Question 7.


What is the output of this program?



1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
int a[2][4] = {3, 6, 9, 12, 15, 18, 21, 24};
6.
cout
  1.    15 18 21
  2.    21 21 21
  3.    24 24 24
  4.    Compile time error
 Discuss Question
Answer is Option B. -> 21 21 21

a[1][2] means 1 * (4)+2 = 6th element of an array staring from zero.
Output:
$ g++ point.cpp
$ a.out
21 21 21

Question 8.

What is meaning of following declaration?
int(*p[5])();


  1.    p is pointer to function.
  2.    p is array of pointer to function.
  3.    p is pointer to such function which return type is array.
  4.    p is pointer to array of function.
 Discuss Question
Answer is Option B. -> p is array of pointer to function.

In the above declaration the variable p is array not pointer.