Difference between new and malloc

Comparison:

 

1. malloc and free are standard library functions of C ++/C, and new/delete are operators of C ++. They can be used to apply for dynamic memory and release memory.
2. For non-Internal data objects, the use of maloc/free alone cannot meet the requirements of dynamic objects.
The constructor must be automatically executed when the object is created, and the Destructor must be automatically executed before the object is extinct.
Since malloc/free is a library function rather than an operator and is not controlled by the compiler, it is impossible to impose the tasks of executing constructor and destructor on malloc/free.
3. Therefore, the C ++ language requires a new operator that can complete dynamic memory allocation and initialization, and a delete operator that can clean up and release memory.
Note that new/delete is not a database function.
4. c ++ programs often call C functions, while C Programs can only use malloc/free to manage dynamic memory. New is an operator, and what "+ ","-", "= "... have the same status
Put simply: malloc and free are C functions, while new and delete are c ++ operators,
New is mandatory, malloc is not, type conversion is required
Of course, there are many different new constructors that can be called. Initializing malloc at the time of declaration only allocates space. initialization should be performed elsewhere, and delete will not only release space, the Destructor will be called before release, and malloc needs to specify the size of the allocated space, while new is automatically calculated.

Difference between new and malloc