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Dynamic Memory Management & Pointers
Question 1
- int *arr = new int *[10];
- int **arr = new int *[10];
- int *arr = new int [10];
- Not Possible
Question 2
What is a pointer in C++?
A variable that stores a data type
A function that points to a variable
A variable that stores the memory address of another variable
A reference variable
Question 3
Which of the following is the correct syntax to declare a pointer?
int ptr;
int &ptr;
ptr *int;
int *ptr;
Question 4
What is the output of the following C++ code?
#include<iostream>
using namespace std;
int main() {
int var = 5;
int *ptr = &var;
cout << *ptr;
return 0;
}
0
5
Address of var
Garbage value
Question 5
What is dynamic memory allocation in C++?
Management of memory automatically
Allocation of memory at compile time
Allocation of memory during runtime
Increasing allocated memory
Question 6
Which of the following is not a valid way to allocate memory dynamically for an integer in C++?
int* ptr = new int;
int* ptr = new;
int* ptr = new int(10);
int* ptr = new int[1];
Question 7
What of the following is the correct way to use 'new' and 'delete' for dynamic memory allocation of an object in C++ ?
MyClass* obj = new MyClass(); delete obj;
MyClass obj = new MyClass(); delete obj;
MyClass* obj = new MyClass(); delete[] obj;
MyClass* obj = new MyClass[1]; delete obj;
Question 8
What is the initial value of dynamically allocated memory in C++?
0
1
Null
Indeterminate
Question 9
What is the effect of assigning a dynamically allocated pointer to nullptr after deletion?
Causes a memory leak
Increases memory usage
Throws an exception
Prevents dangling pointer issues
Question 10
What will be the output of the following program?
#include <iostream>
using namespace std;
int main()
{
int a = 32, *ptr = &a;
char ch = 'A', &cho = ch;
cho += a;
*ptr += ch;
cout << a << ", " << ch << endl;
return 0;
}
32, A
32, a
129, a
129, A
There are 12 questions to complete.