File: main.c

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#include <stdlib.h>
#include <assert.h>

int main()
{
  int *ptr=malloc(sizeof(int));
  *ptr=42;
  ptr=realloc(ptr, 20);
  assert(*ptr==42);

  int *ptr2=malloc(2*sizeof(int));
  *ptr2=42;
  *(ptr2+1)=42;
  ptr2=realloc(ptr2, 20);
  assert(*ptr2==42);
  assert(*(ptr2+1)==42);

  return 0;
}