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

1 vote140 views2 answers
Create role with password postgres
C
0 vote203 views1 answer
Get configuration script window 7
C
3 votes188 views1 answer
Haskell print
C
0 vote188 views1 answer
Imprimir matriz
C
0 vote204 views1 answer
Virtualbox how to move vmdk to another folder
C
0 vote212 views2 answers
How to determine the level of each node in the given tree?
C
0 vote182 views1 answer
Series sort values
C
0 vote191 views2 answers
233 pounds to inr
C
0 vote202 views1 answer
Gsl matrix invert
C
16 votes233 views6 answers
Golang map
C