Allocation of memory: In static memory allocation the variables are allocated permanently hence a wastage of memory is occurred, But in case of dynamic memory allocation the variables are get allocated until the program unit gets inactive. Memory allocation occurs during runtime.
Programming in C
It is a statement in C that allows to execute a specific code block. It is one of the many alternative ways. Note: switch case follows a top-down approach. Syntax : Example : 1 Explanation:For value 1, the expression is matched with all the case values, the case value which matches with the expression i.e. …
Though both malloc() and calloc() are used in C programming language to allocate memory dynamically. Despite of having some similarity there are some difference too between these two statements.
For storing it in the pointer of required data type (int, float, char etc.) we have to typecast it. Until we typecast a memory allocation the compiler will not get to know that what type of data we are gonna store to through the pointer. That’s why it’s important to typecast.
In dynamic memory allocation the memory have to be deallocated explicitly. It releases all the used memory spaces previously allocated by calloc(), malloc() or realloc() functions. If we no longer need the data stored in a particular block of memory, then we should have a practice to release that memory for future use. After freeing the memory blocks the memories are returned to heap.
Realloc stand for Reallocation. At the time of memory allocation using calloc() or malloc(), it may be possible memory is excess or insufficient. So for that reason we need to reallocate memory at the run time. realloc() is used to dynamically reallocate those memory without losing the data.
Calloc stands for Contiguous Allocation. To allocate memory dynamically we also use the function which is called as calloc() function. calloc() function on success returns the base address of the array and every memory location will be initialized to 0. Whereas in malloc() it was initialized by a garbage value.
In case of static memory allocation there are some drawbacks like: wastage of memory, less flexibility, permanent allocation of variables etc. To overcome these situations the concept of Dynamic Memory Allocation has been introduced. In dynamic memory allocation the memories can be allocated dynamically at run time. There 4 library functions that are described under <stdlib.h> …
Suppose we have an array of length 5 named a shown below Now during the length of the array (5) is fixed here. But what if we need to change the size of the array as per circumstances? It won’t be possible right? Here comes the idea of dynamic memory allocation where we can change …
%p is a format specifier in C programming language used to print the pointer type data. It prints the memory address of the variable in hexadecimal form.