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Difference between Malloc and New

Difference between Malloc and New

Malloc and new are two functions that allocate memory in C++. malloc is a function that returns a block of uninitialized memory, while new is a function that returns a pointer to an initialized object. In this blog post, we’ll take a look at the differences between malloc and new, and when you should use each one. We’ll also discuss some best practices for using malloc and new. Stay tuned!

What is Malloc?

Malloc is a memory management function that is used to allocate memory to variables during runtime. This function is part of the C standard library and is also available in other programming languages that are based on C, such as C++ and Objective-C. Malloc takes a single argument, which is the size of the block of memory that needs to be allocated. The function then returns a pointer to the beginning of the allocated block. If there is not enough memory available to allocate the requested block, Malloc will return a NULL pointer. For this reason, it is important to check the return value of Malloc before using the allocated memory. Memory that has been allocated with Malloc must be freed using the Free function when it is no longer needed, in order to avoid leaking memory.

What is New?

New allocate memory is a type of computer memory that is used to store data that is currently being processed. This type of memory is typically used by applications that require a lot of processing power, such as video editing or 3D rendering. New allocate memory is different from other types of memory, such as system memory or cache memory, because it is not directly accessible by the CPU. Instead, data must be transferred from new allocate memory to system memory before it can be processed. New allocate memory is typically slower than other types of memory, but it is essential for applications that require a lot of processing power.

Difference between Malloc and New

Malloc and new are two ways of allocating memory to variables in C++. Malloc is part of the C standard library, while new is an operator introduced in C++. Both Malloc and new allow you to dynamically allocate memory during runtime, but there are some important differences to be aware of. Malloc allocates memory for a single object, while new can allocate memory for an array of objects. Malloc returns a void pointer, which needs to be cast to the correct data type, while new automatically initializes the object with the correct data type. Malloc does not call the constructor for the object, while new does. Finally, Malloc requires you to explicitly deallocate memory using free(), while new calls the destructor for the object and automatically deallocates memory. Although both Malloc and new serve similar purposes, understanding the subtle differences between them is important for any C++ programmer.


In conclusion, Malloc should be used for allocations that are intended to last for the life of the program while New should be used for one-time allocations or when you need to return memory to the system.

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