What is the difference between creating an object,
using 'new' and using 'malloc'?
- 3 Answers
- 11211 Views
- HFG, Siemens, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / btech
new operator returns a pointer of the correct type and
malloc() returns a void*
New calls the object’s constructor and malloc does not.
Any object created with new must be freed using delete and
where as malloc() and free() allocates and deallocates
memory
new operator can be overloaded by a class, where as
malloc() can't be overloaded.
| Is This Answer Correct ? | 9 Yes | 0 No |
Answer / sundaram
?new? is used for dynamic memory allocation in C++,
?malloc()? is used for dynamic memory allocation in C.
?new? allocates memory on heap.
?malloc()? allocates memory on heap.
?new? is operator,
?malloc()? is function
?new? returns memory pointer to the correct object on
SUCCESS,
?malloc? returns pointer to void void* on success
?new? throws exception called ?bad_alloc? on FAILURE,
?malloc? returns NULL on FAILURE
?new? is 2 step process
(i) First Allocates memory for a given object
(ii) Calls corresponding destructor if required
?malloc? is one step process ie it allocating only memory.
| Is This Answer Correct ? | 7 Yes | 2 No |
Answer / guna
malloc
1) can't initialize the memory
2)type casting is required
3)malloc is a function.
4)can't be overloaded.
new
1) memory can be initialized
2)no type casting for operator
3)new is an operator
4)can be overloaded.
| Is This Answer Correct ? | 0 Yes | 0 No |
What Is A Default Constructor in C++ ?
In C++ what is a vtable and how does it work?
What does malloc return in C and C++?
Identify the errors in the following program. #include <iostream> using namespace std; void main() { int i=5; while(i) { switch(i) { default: case 4: case 5: break; case 1: continue; case 2: case 3: break; } i-; } }
Explain why C++ is not purely Object Oriented Language
What is a virtual function in C++?
Write a C++ Program to find Square Root of a number using sqrt() function.
Execute the qsort () in c/sort() in c++ library or your own custom sort which will sort any type of data on user defined criteria.
What is an algorithm (in terms of the STL/C++ standard library)?
How will you print a list of all unique words from a string which may contain repeated words?
How to delete array of objects in C++? Proof by C++ code for proper deletion
Define namespace.
C 
