📅  最后修改于: 2022-03-11 15:04:37.109000             🧑  作者: Mango
#include
#include
int main(void)
{
{
int* px = malloc(sizeof(int));
*px = 3;
printf("&px = %i, px = %p\n", *px, px);
free(px);
if( px == NULL)
printf("px is null after free\n");
else
printf(" px = %p\n",px);
}
// this printf would demonstrate that px is out of scope.
// printf(" px = %p\n",px);
}