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What function is used to release the memory on heap?
The free() function releases memory obtained with the malloc() family of functions. The delete and delete [] operators release memory obtained with the new operator. Note: realloc() can allocate and free memories as well as reallocate.
What is the difference between malloc and new other than syntax?
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.
Who is the address operator?
The address operator, often represented by the ampersand symbol (&) in programming languages like C and C++, is used to retrieve the memory address of a variable. By applying the address operator to a variable, you can obtain a pointer that points to the location in memory where that variable is stored. This is essential for pointer manipulation and dynamic memory management in these languages.
What is the use of new operator?
A new operater is used to allocating a memory space for a particular object.
Which is the unary operator used to dereference a pointer and return the value stored in it?
The asterisk (*) operator dereferences a pointer and returns the value stored in the memory pointed to by the pointer.
Which operator is used for deallocating memory in c plus plus?
delete
Difference between new operator and operator new?
new operator allows to allocate a memory from the heap..... so a new instance of a class is created.......... but operator new is used to overload the (new) operator........ juast like overloading of other operators
What function is used to release the memory on heap?
The free() function releases memory obtained with the malloc() family of functions. The delete and delete [] operators release memory obtained with the new operator. Note: realloc() can allocate and free memories as well as reallocate.
What are the different function used for dynamic memory allocation?
alloc :- to allocate memory. calloc :- to free the memory.
Are new and delete operators in c plus plus related to flush?
The new and delete operators in C++ are not related to flush. New is used to allocate memory, while delete is used to deallocate memory. Flush is a library concept that allows you to ensure that IO is completed, and not buffered, before proceeding to the next step.
How can delete operator used to prevent memory leak?
ss
How is memory management achieved by pointers in c plus plus?
Memory management in C++ is achieved using the new and delete operators. These operators are synonymous with the malloc() and free() functions found in C, and which you can also use in C++ but then your code would not strictly be C++. However, the new and delete operators are implemented behind the scenes with malloc() and free(), so the distinction at this level is somewhat moot.Although the new operator and malloc() function effectively do the same job, the new operator greatly simplifies the process. Whereas malloc() requires that you specify the exact amount of memory required, the newoperator can determine the amount at compile time, based upon the type of memory required. Moreover, the new operator returns a pointer to the required type whereas the pointer returned by malloc() must be cast to the appropriate type.There's very little difference between the deleteoperator and the free() function, however they are not interchangeable. If memory was allocated with the newoperator, then it must be released with the delete operator, not the free() function.Apart from these differences, memory management in C++ is much the same as it was with C. Whether memory is allocated with the new operator or the malloc() function, you must maintain a pointer variable to hold the reference that is returned (or a NULL value if the allocation failed). When the memory is no longer required, it must be released back to the system by deleting or freeing the original pointer or a copy of the original pointer. At that point, all pointers to that memory are deemed invalid, and should be zeroed to ensure they no longer refer to invalid memory.Note that the malloc() function also has two variants: calloc() and realloc(). calloc() works much the same as malloc() but is used to allocate a count of contiguous memory blocks, like an array, while realloc() is used to release an existing allocation and allocate another to the same pointer. There is no equivalent operator for realloc()in C++.
What is the difference between malloc and new other than syntax?
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.
What are the three major activities of an operating system with regard to memory management?
1- keeping track of which parts of memory are currently being used and by whom.2- decide which process is to be loaded in memory when the space is available.3- allocate and deallocate memory space as needed.
Who is the address operator?
The address operator, often represented by the ampersand symbol (&) in programming languages like C and C++, is used to retrieve the memory address of a variable. By applying the address operator to a variable, you can obtain a pointer that points to the location in memory where that variable is stored. This is essential for pointer manipulation and dynamic memory management in these languages.
What is an object in Java?
object is an instance of a class. it's used to allocate memory dynamically at run time to access class members.
What are the advantages of the new operator?
The new operator in C++ works in a similar manner to malloc in C, allocating memory from the heap (the free store). However, unlike malloc which returns a void* pointer to uninitialised memory, the new operator returns a pointer of the given type and invokes the appropriate constructor for that type. Moreover, every class of object can overload its new operator to allow construction within memory that has been allocated in advance. That memory is typically allocated through a resource handle (known as an allocator), however we can also override the global new operator if we need to provide our own memory management. We can still use malloc in C++, however it has no advantages over the new operator and is best avoided in the interests of consistency and, more importantly, type safety. In practice we rarely use the new operator unless we are actually designing our own resource handles or low-level memory allocators. The standard library already provides highly efficient resource handles for the vast majority of our everyday needs, so it is rarely necessary to design our own. Nevertheless, the facility exists for those (very) rare occasions where we really do require "raw" memory.
