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How is memory allocated in c program for a character data type?
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∙ 13y ago
One byte for every character.
Wiki User
∙ 13y ago
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Is memory allocated at runtime for the static variables?
No. Static memory is allocated at compile time. Static variables are allocated within the program's data segment which is a physical part of the executable. When you load the executable into memory, the operating system sets aside enough memory for the entire executable and copies it, byte for byte, into that memory. So when the program is executed, the data segment is already allocated.
Does a compiler allocate memory space for each constant?
No. Memory is allocated for each unique constant rather than to each individual constant. However, compilers do not physically allocate memory; the constants are allocated in the program's data segment at linktime. The actual allocation within memory occurs at loadtime, when static memory is physically allocated to the executable. Constants are then initialized using information found in the program's data segment.
What is the difference between stack and heap memory in C?
stack is memory allocated for temporary variables used by subroutinesheap is memory allocated for long term data structures (e.g. linked lists, trees) that are likely to change sizeBoth are forms of dynamically allocated memory (i.e. allocated/deallocated at runtime as needed), but the allocation/deallocation method and their place in physical/virtual memory are differentStatically allocated memory (i.e. allocated at compile/link time) is used for variables and data structures that must exist as long as the program is running and cannot change in size while the program is running.
What do you understand by static memory allocation and dynamic memory allocation?
MEMORY ALLOCATION MODELS……STATIC MEMORY ALLOCATION DYNAMIC MEMORY ALLOCATIONMemory is allocated before the execution of the program begins.(During Compilation)Memory is allocated during the execution of the program.No memory allocation or deallocation actions are performed during Execution.Memory Bindings are established and destroyed during the Execution.Variables remain permanently allocated.Allocated only when program unit is active.Implemented using stacks and heaps.Implemented using data segments.Pointer is needed to accessing variables.No need of Dynamically allocated pointers.Faster execution than Dynamic.Slower execution than static.More memory Space required.Less Memory space required.
Is declaration of variables allocated memory?
Constants, static variables and global variables are allocated in the program's data segment at compile time. Local variables are allocated on the stack at runtime. Variables cannot be allocated on the heap, you must use a constant, static variable, global variable or local variable to store the start address of a dynamic memory allocation. The variable must be a raw pointer or a reference handle (a smart pointer).
Is memory allocated at runtime for the static variables?
No. Static memory is allocated at compile time. Static variables are allocated within the program's data segment which is a physical part of the executable. When you load the executable into memory, the operating system sets aside enough memory for the entire executable and copies it, byte for byte, into that memory. So when the program is executed, the data segment is already allocated.
Does a compiler allocate memory space for each constant?
No. Memory is allocated for each unique constant rather than to each individual constant. However, compilers do not physically allocate memory; the constants are allocated in the program's data segment at linktime. The actual allocation within memory occurs at loadtime, when static memory is physically allocated to the executable. Constants are then initialized using information found in the program's data segment.
What is the difference between stack and heap memory in C?
stack is memory allocated for temporary variables used by subroutinesheap is memory allocated for long term data structures (e.g. linked lists, trees) that are likely to change sizeBoth are forms of dynamically allocated memory (i.e. allocated/deallocated at runtime as needed), but the allocation/deallocation method and their place in physical/virtual memory are differentStatically allocated memory (i.e. allocated at compile/link time) is used for variables and data structures that must exist as long as the program is running and cannot change in size while the program is running.
What do you understand by static memory allocation and dynamic memory allocation?
MEMORY ALLOCATION MODELS……STATIC MEMORY ALLOCATION DYNAMIC MEMORY ALLOCATIONMemory is allocated before the execution of the program begins.(During Compilation)Memory is allocated during the execution of the program.No memory allocation or deallocation actions are performed during Execution.Memory Bindings are established and destroyed during the Execution.Variables remain permanently allocated.Allocated only when program unit is active.Implemented using stacks and heaps.Implemented using data segments.Pointer is needed to accessing variables.No need of Dynamically allocated pointers.Faster execution than Dynamic.Slower execution than static.More memory Space required.Less Memory space required.
Is declaration of variables allocated memory?
Constants, static variables and global variables are allocated in the program's data segment at compile time. Local variables are allocated on the stack at runtime. Variables cannot be allocated on the heap, you must use a constant, static variable, global variable or local variable to store the start address of a dynamic memory allocation. The variable must be a raw pointer or a reference handle (a smart pointer).
How is memory allocated to the private-data member function when an object is not created during the calling process?
A class can have both static and non-static data. Static data is local to the class while non-static data is local to each object of the class. It makes no difference whether static data is global, local to a file, local to a function or local to a class (whether public, protected or private), all static data is allocated within the program's data segment along with all constants. As such they are allocated at compile time.
What is data adapter?
you can get data from dababase to your program memory by data adapter.
Difference between dynamic and static memory allocation?
Static memory allocation is memory allocated on the "stack" and cannot be resized after the initial allocation, while dynamic memory allocation is memory allocated in the "heap", and can be dynamically expanded and shrunk as necessary.
Why memory is divided into initialized and uninitialized areas?
The program's data segment. This area of memory is allocated by the linker and is used to store the program's global variables, static variables, static arrays and constants. Constants are always initialised, as are static variables, but global variables and static arrays need not be initialised.
What program in an OS coordinates the memories by tracking which one is available which is to be allocated or deallocated and how to swap between the main memory and secondary memories?
The memory manager is the program responsible for managing memory allocation and deallocation in an operating system. It keeps track of which memory is available and allocates it to processes based on their needs. It also handles swapping data between main memory and secondary storage when the system runs low on physical memory.
How can you increase the size of a statically allocated array?
/* Allocate space for an array with ten elements of type int. */int *ptr = malloc(10 * sizeof (int));if (ptr == NULL) { /* Memory could not be allocated, the program should handle the error here as appropriate. */ realloc It is often useful to be able to grow or shrink a block of memory. This can be done using realloc which returns a pointer to a memory region of the specified size, which contains the same data as the old region pointed to by ptr (truncated to the minimum of the old and new sizes). If realloc is unable to resize the memory region in-place, it allocates new storage, copies the required data, and frees the old pointer. If this allocation fails, realloc maintains the original pointer unaltered, and returns the null pointer value. The newly allocated region of memory is uninitialized (its contents are not predictable). The function prototype is void *realloc(void *pointer, size_t size);
What is the purpose of storing a program in memory?
Anything stored in memory can be accessed much faster than items stored on the harddrive. This is basically because of the physical composition of memory chips which allows for much faster data-transfer. The tradeoff is the amount of space that memory provides, and the number of programs that end up sharing the memory. So, when a program is stored in memory, its execution is much faster. However, if a program exists ONLY in the memory, and does not store any data on the primary disk, then when you exit a program, all your data will also be destroyed due to active memory management that takes place. Data will not persist when program exists. Hence, you will need to write the data to a file on the hardisk which can be accessed later and loaded into the memory next time when the program runs.
