pointers.c

#include <stdio.h>
#include <stdlib.h>

int main()
{
	int x;
	int *p;

	p = (int*)malloc(sizeof(x));
	p = &x;
	scanf( "%d", &x );
	printf( "%d\n", *p );
	free(p);
}

I'd write what I think you're trying to do as:

int main()
{
  int *p = malloc(sizeof(int));

  scanf("%d", p);
  printf("%d\n", *p);

  free(p);

  return 0;
}