Realloc in c

#include <stdio.h>
int main () {
   char *ptr;
   ptr = (char *) malloc(10);
   strcpy(ptr, "Programming");
   printf(" %s,  Address = %u\n", ptr, ptr);

   ptr = (char *) realloc(ptr, 20); //ptr is reallocated with new size
   strcat(ptr, " In 'C'");
   printf(" %s,  Address = %u\n", ptr, ptr);
   free(ptr);
   return 0;
}

Source: guru99.com

Realloc

int ptr_new = *realloc(void *ptr, size_t size); 
Where 'ptr_new' is the new pointer you want to point to the required Dynamic
memory, 'ptr' is the already existing pointer to a dynamic memory and 'size'
is the new size of dynamic memory that you want to allocate.

Working:
Realloc creates/allocates a new memory in heap with specified size and copies
all the contents from the previous memory pointer to by the pointer 'ptr'.
It the deallocates the memory in heap pointed to by the old pointer i.e, 'ptr'.
Note: pointer 'ptr' should also point to a memory in heap.

Realloc in c

void *realloc(void *ptr, size_t size)

Similar codes

0 vote231 views1 answer
Vifm preview images
C
0 vote267 views1 answer
Graphics in C
C
0 vote282 views2 answers
Create role in psql with password
C
0 vote183 views1 answer
Yt derived field
C
-2 votes244 views1 answer
Copy array of integers in c
C
13 votes215 views2 answers
Python driver.get
C
1 vote242 views1 answer
No module named 'vectormath'
C
0 vote218 views1 answer
Google business customer care number india 24/7
C
-1 vote223 views1 answer
Free array in c
C
29 votes241 views3 answers
Online embedded c compiler
C