realloc() :
- It is used to increase/decrease the size of array which is created by calloc()
- Using calloc(), we can create the size with fixed size
- Dynamic memory : Size varies depends on requirement
- We can modify the size of array using realloc() function
void* realloc(void* ptr, size_t size);
| #include<stdlib.h> void main(){ int *p1, *p2, m, n; printf(“enter size of array : “); scanf(“%d”,&m); p1 = (int*)calloc(m,sizeof(int)); if(p1 == NULL){ printf(“calloc failed\n”); exit(1); } else printf(“memory allocated..\n”); printf(“Enter new size of array : “); scanf(“%d”,&n); p2=(int*)realloc(p1 , n*sizeof(int)); if(p2 == NULL){ printf(“realloc failed\n”); exit(1); } else printf(“memory re-aquired..\n”); free(p1); free(p2); } |
free() :
- The memory which has allocated dynamically must be released explicitly using free function.
- Function prototype is:
- void free(void* ptr);
- Using free() unction , we can de-allocate the memory of any type of pointer.