What is Calloc() function in C Programming Language?
A calloc() function allocates space for an array of elements of a certain size and initializes the memory to zero.
- void *calloc(size_t num, size_t size);
Here num is number of objects to allocate and size is the size of each objects. If the allocation is successful then function returns a Pointer to the first byte and if allocation fails then the function returns NULL.
Examples:
- #include<stdio.h>
- #include<stdlib.h>
- void main()
- {
- unsigned a;
- int *ptr;
- printf(“Enter the number to allocate:-”);
- scanf("%d", &a);
- ptr= (int*) calloc(a, sizeof(int));
- if(ptr!=NULL)
- {
- puts("Memory allocation successful");
- }
- else
- {
- puts("Memory allocation failed");
- }
- return(0);
- }
Output:-
- Enter the number to allocate:- 200
- Memory allocation successful
- Enter the number to allocate:- 111111111111
- Memory allocation failed
