#include <stdio.h> #include <stdlib.h> int main() { int *ptr1, *ptr2; // Allocate memory ptr1 = malloc(4); // Attempt to resize the memory ptr2 = realloc(ptr1, 8); // Check whether realloc is able to resize the memory or not if (ptr2 == NULL) { // If reallocation fails   printf("Failed. Unable to resize memory"); } else { // If reallocation is sucessful   printf("Success. 8 bytes reallocated at address %p \n", ptr2);   ptr1 = ptr2;  // Update ptr1 to point to the newly allocated memory } return 0; }