【例11-2】int a = 10, b = 20, t;int *pa =&a, *pb =&b,*pt;int **ppa = &pa, **ppb = &pb, **ppt;ppapaa**ppa&&pa20*pbpbppbb**ppb&10&pa*pa操作(1): ppt = ppb; ppb = ppa; ppa= ppt;操作(2): pt = pb; pb = pa; pa = pt;操作(3)： t=b;b=a;a=t;&a pa a &pa 10 ppa **ppa *pa &b pb b &pb 20 ppb **ppb *pb ppa pa a &pb &a 10 **ppb *pa &b pb b &pa 20 ppb **ppa *pb ppa pa a &pb &b 10 **ppa *pb &a pb b &pa 20 ppb **ppb *pa ppa pa a &pb &b 20 **ppa *pb &a pb b &pa 10 ppb **ppb *pa int a = 10, b = 20, t; int *pa = &a, *pb = &b, *pt; int **ppa = &pa, **ppb = &pb, **ppt; 【例11-2】 操作(1)：ppt = ppb; ppb = ppa; ppa = ppt; 操作(2)：pt = pb; pb = pa; pa = pt; 操作(3)：t = b; b = a; a = t;