#include <stdio.h>
#include <stdlib.h>
int main()
{
int* p = (int*)malloc(40);
if (p!=NULL)
{
;
}
for (int i = 0; i < 10; i++)
{
printf("%d", p[i] = i);
}
printf("\n");
int* ptr = NULL;
ptr = (int*)realloc(p, 80);
if (ptr != NULL)
{
p = ptr;
}
for (int i = 0; i < 20; i++)
{
printf("%d", p[i] = 1);
}
free(p);
p = NULL;
return 0;
}