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What is the difference between new and malloc?

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2006-03-10 06:00:05
2006-03-10 06:00:05

For the dynamic memory allocation we use New and malloc. Both are used to allocate memory But the major difference between New and Malloc are. 1. New is a operator where as Malloc is a function. 2.In case of Malloc we need to specify the size of memory for our data types. But in case of New we do not need to specify the size. ex. int *a; a=(int*)malloc(sizeof(int)); int *a; a=new int; one more difference is malloc return void* by default ,we need to typecast pointer returned from malloc but in case of new there is no need to typecast ex: int *a; a=(int*)malloc(sizeof(int)); a= new int; arun

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What is the difference between malloc() and calloc()?

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Nothing, malloc does allocate memory from the heap.

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http://www.diffen.com/difference/Calloc_vs_Malloc try this. =)

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Hi, The difference between new and malloc: 1.The New is a operator however malloc is a function 2.New returns the object type and there is no typecasting required. In malloc type casting should be done as it returns a void*. 3. The new operator can be overloaded however there is no over loading in C and hence Malloc can not be overloaded. 4. Operater New asks for the number of objects to be allocated however in malloc it will ask you for the number of bytes to be allocated. 5. The New operater will return you a exception of memory is not available however in malloc it will return u a NULL. 6. New is a concept for dynamically allocation in OOPS(C++) however malloc is used in C. The difference between the delete and free is as follows: 1. delete is a operator and can be overloaded however free is a function and can not be overloaded. With Regards, Shashiraja Shastry

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malloc will return a 0 if memory is unable to be allocated. new on the other hand will either throw an exception or also return 0, depending on the compiler and the compiler settings.

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alloc is used as header file while using malloc and calloc functions in C prog.The definition of malloc function is in the alloc.h file.It's stdlib.h to be more precise

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malloc allocate a memory section whereas memset manipulate the content of the memory section, (for example fill a memory section pointed by pointer ptr with 0, we use memset(ptr,0,sizeof(ptr_data_type)) A memory section must be allocated(using either 'malloc' or 'new' in C++) before memset can be used on it.

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They are the same, and are often versions of the same routine. The difference is that operator new also invokes the constructor.

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new calls constructor of classes and delete calls deconstructor. malloc and free dont. also the syntax is hard with malloc eg. malloc(int) sizeof(int) or whatever while int * x; x= new int(9)

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When new has an object, space for the object is not only allocated but the object's constructor is called. And similarly when delete as an object, the object's destructor is called before the memory is released. If malloc and free are used, the destructor and constructor do not get called respectively and obviously, this simply won't do in C++ except in certain very rare situations where classes are present without any specific destructor/constructors. Operator new automatically calculates the size of the object that it constructs. Conversely, with malloc(), the programmer has to specify explicitly the number of bytes that have to be allocated. In addition, malloc() returns void *, which has to be explicitly cast to the desired type. This is both tedious and dangerous. Operator new returns a pointer to the desired type, so no explicit typecast is required. new and delete automatically construct and destroy objects. malloc() and free(), on the other hand, merely allocate and deallocate raw memory from the heap. delete can be overloaded, free cannot. delete invokes the destructor of the object to be deallocated, free does not do this. The difference could be qouted as - 1. Operator new constructs an object (calls constructor of object), malloc does not. 2. Operator new is an operator, malloc is a function. 3. Operator new can be overloaded, malloc cannot be overloaded. 4. Operator new throws an exception if there is not enough memory, malloc returns a NULL. 5. Operator new[] requires to specify the number of objects to allocate, malloc requires to specify the total number of bytes to allocate. 6. malloc() returns void *, which has to be explicitly cast to the desired type but new returns the proper type. 7. Operator new/new[] must be matched with operator delete/delete[] to deallocate memory, malloc() must be matched with free() to deallocate memory. 8. The new/delete couple does not have a realloc alternative that is available when malloc/free pair is used. realloc is used to resize the length of an array or a memory block dynamically.

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malloc will allocate a block of memoryrealloc will resize a block of memory// allocate a pointer to a block of memory to hold 10 intsint *intArray = malloc(10 * sizeof(int));// change intArray to hold 15 intsintArray = realloc(15 * sizeof(int));

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Dynamic memory can be declared at run-time using the new and delete operators (or malloc and free in C), while static memory must be declared at compile-time.

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In C, malloc is used to reserve a predetermined size of memory. void * malloc ( size_t size ); calloc is used to reserve a chunk of memory large enough to store num elements, each of a predetermined size. void * calloc ( size_t num, size_t size ); To create a char array of size 10 you can do it in one of two ways: char* mChars = malloc( 10 * sizeof(char) ); char* cChars = calloc( 10, sizeof(char) ); There is no concept of malloc or calloc in Java.

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malloc reserves memory for your use, free removes the reservation done by malloc and makes the memory available for other applications.Note: both of them is a special case of realloc:malloc (n) = realloc (NULL, n)free (p) = realloc (p, 0)

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Are you talking about freeing dynamically allocated memory in C/C++? free() is a function that you use to release dynamically (i.e. at run-time) created memory in C, using malloc() or alloc() or such other functions. In the same way, delete() is a function that is used in C++ to release memory created at run-time using the function new(). (Note that you can still use malloc and other C functions in your C++ code, but it is not considered a good programming habit. Moreover, new() is easier to use and more flexible, once you get the hang of it. If this is not what you had in mind, then I do not know if this will be of any help to you. addition: -new is constructor of which delete is destructor so use in pairs always.. similarly use malloc with free.. extra note: - no type cast required for new , whereas malloc, free may require it. - new returns exception whereas malloc returns NULL when memory issue.

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Click on the link to your right for the answer.Answerboth malloc and new functions are used for dynamic memory allocations and the basic difference is: malloc requires a special "typecasting" when it allocates memory for eg. if the pointer used is the char pointer then after the processor allocates memory then this allocated memory needs to be typecasted to char pointer i.e (char*).but new does not requires any typecasting. Also, free is the keyword used to free the memory while using malloc and delete the keyword to free memory while using new, otherwise this will lead the memory leak. AnswerBesides the basic syntactical difference: malloc is a C function which will allocate the amount of memory you ask and that's it. new is a C++ operator which will allocate memory AND call the constructor of the class for which's object memory is being allocated. Similarily, free is a C function which will free up the memory allocated. but delete is a C++ operator which will free up the allocated memory AND call the destructor of the object.Answermalloc in a function and new is an operator, and its a good programming practice to use an operator instead of functions, because function itself requires some time to be executed whenever that particular function is called. so the main difference is that we use operators instead of malloc because of the TIME CONSTRAINT. Answer1.malloc requires the type casting during decleration , where as new doesn't needed the type casting during decleration 2. when ever we use new for allocating memory along with this it calls the constructor of the class for which object memory is allocated 3. in case of malloc free is the word used to clear the memory, where as delete is the format used in case of new to free the memory after usage 4. malloc is function, where as new is operator..so the time required for execution is less in case of new (it being a operator) as compared to malloc(it being a function) Answer1. malloc is a function call, while new is an operator. This difference is syntactic; behind the scenes, they both perform pretty much the same work to allocate the memory, and operator new also invokes any required constructors. There is a commonplace urban myth that operators are somehow faster in your code than functions; this is not correct, as any operator (except for mathematical operations that correspond directly to a single machine-code instruction) invocation amounts to a function call in any case. 2. malloc can fail, and returns a NULL pointer if memory is exhausted. Operator new never returns a NULL pointer, but indicates failure by throwing an exception instead. There is also a nothrow() version of operator new, which does return NULL on failure.

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