Essential C++ Pointers & Functions Interview Questions & Answers:

1. Where does the execution of the program starts?
a) user-defined function
b) main function
c) void function
d) none of the mentioned

b) main function

2. What are mandatory parts in function declaration?
a) return type,function name
b) return type,function name,parameters
c) both a and b
d) none of the mentioned

a) return type,function name

3. How many max number of arguments can present in function in c99 compiler?
a) 99
b) 90
c) 102
d) 127

d) 127

4. Which is more effective while calling the functions?
a) call by value
b) call by reference
c) call by pointer
d) none of the mentioned

b) call by reference

5. The output of this program?

#include <iostream>
using namespace std;
int main()
{
int arr[] = {4, 5, 6, 7};
int *p = (arr + 1);
cout << *p;
return 0;
}
a) 4
b) 5
c) 6
d) 7

b) 5

6. Output of this program?

#include <iostream>
using namespace std;
int main()
{
int i;
char *arr[] = {"C", "C++", "Java", "VBA"};
char *(*ptr)[4] = &arr;
cout << ++(*ptr)[2];
return 0;
}
a) ava
b) java
c) c++
d) compile time error

a) ava

7. What is the output of this program?

#include <iostream>
using namespace std;
int main()
{
int a[2][4] = {3, 6, 9, 12, 15, 18, 21, 24};
cout << *(a[1] + 2) << *(*(a + 1) + 2) << 2[1[a]];
return 0;
}
a) 15 18 21
b) 21 21 21
c) 24 24 24
d) Compile time error

b) 21 21 21

8. 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

b) p is array of pointer to function.

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

c) 2

10. How many minimum number of functions are need to be presented in c++?
a) 0
b) 1
c) 2
d) 3

b) 1