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 vote158 views1 answer
Python adding calculator
C
0 vote168 views1 answer
D3 box shadow
C
0 vote154 views2 answers
Google cloud open port
C
1 vote173 views1 answer
Java.lang.SecurityException: Permission denied (missing INTERNET permission?)
C
2 votes153 views1 answer
Square in c
C
2 votes165 views8 answers
NgIf
C
0 vote97 views1 answer
Strftime c
C
6 votes164 views4 answers
Angle between two points
C
17 votes146 views6 answers
Array in c
C
0 vote140 views1 answer
50 north main 07522
C