C深度剖析，指针大小，迷惑死你

#include<stdio.h>
int b[100];
void fun(int b[100])
{
	sizeof(b);
	printf("%d\n",sizeof(b));					//4
}
int main()
{int a[100];
	int *p =NULL;
	printf("%d\n",sizeof(*p));					//4
	printf("%d\n",sizeof(a[100]));				//4
	printf("%d\n",sizeof(&a));					//400
	printf("%d\n",sizeof(&a[0]));				//4
	printf("%d\n",sizeof(a));					//400
	fun(a);
	while(1);
	return 0;
}