举例:
int *
p[3], *pa, a=12, b=20;
pa = &a;
p[0] = pa;
p[1] = &b;
p[0]=pa
0
1
a
b
p[1]=&b
p[2] 随机值
&a
12
20
2
pa
p
p[0] 随机值
0
1
a
b
p[1] 随机值
p[2] 随机值
随机值
12
20
2
pa
p
*p[0] 等价于 a *p[1] 等价于 b