NEW:

• calls constructor
• It is an operator
• Returns exact data type
• on failure, Throws bad_alloc exception
• size is calculated by compiler

malloc() :

• does not calls constructors
• It is a function
• Returns void *
• On failure, returns NULL
• size is calculated manually

new is faster than malloc() because an operator is always faster than a function.

The main differences between new and malloc() are:

1. new is type-safe and automatically calculates the required memory size based on the object type, while malloc() is not type-safe and requires manual size specification in bytes.
2. new calls the constructor of the object being created, ensuring proper initialization, whereas malloc() does not invoke any constructor.
3. new returns a pointer to the type being allocated, while malloc() returns a void* pointer that requires a typecast.
4. new throws a std::bad_alloc exception if memory allocation fails, while malloc() returns a NULL pointer for error checking.
5. new is preferred in modern C++ programming, but malloc() may be necessary when working with legacy code or interfacing with C libraries.

malloc(): It is a C library function that can also be used in C++, while the “new” operator is specific for C++ only. Both malloc() and new are used to allocate the memory dynamically in heap. But “new” does call the constructor of a class whereas “malloc()” does not.

malloc() is a C library function that can also be used in C++, whereas the “new” operator is only available in C++. Both malloc() and new are used to dynamically allocate memory in heap. However, “new” invokes the constructor of a class, whereas “malloc()” does not.