int a[10]; memset(a, 0, sizeof(a)); int *pt = a; *pt = 2; pt[1] = 1; pt++; printf("*pt = %d, pt[-1] = %d, sizeof(a) = %d\n", *pt, pt[-1], sizeof(a)); --pt; *(pt + 10) = 77; int (*p)[10] = &a; memset(*p, 0, sizeof(*p)); (*p)[0] = 10; (*p)[1] = 9; printf("**p = %d, (*p)[1] = %d, sizeof(*p) = %d\n", **p, (*p)[1], sizeof(*p)); p++; //跳过40个地址长度,即a[10]连续地址之后, printf("**p = %d\n", **p); //得到77这个值 --p; //为不影响后面的结果,修正p的指向为a[0]的地址; int (**pa)[10] = &p; memset(**pa, 0, sizeof(**pa)); (**pa)[0] = 50; (**pa)[1] = 30; printf("***pa = %d, (**pa)[1] = %d, sizeof(**pa) = %d,\n", ***pa, (**pa)[1], sizeof(**pa)); int **pp = &p; memset(*pp, 0, sizeof(**pa)); (*pp)[0] = 31; (*pp)[1] = 32; (*pp)++; printf("**pp = %d, (*pa)[-1] = %d\n", **pp, (*pp)[-1]); --(*pp); int ***ppp = &pp; memset(**ppp, 0, sizeof(**pa)); ***ppp = 40; (**ppp)[1] = 99; (**ppp)++; printf("***ppp = %d, (**ppp)[-1] = %d\n", ***ppp, (**ppp)[-1]); --(**ppp); int ****pppp = &ppp; memset(***pppp, 0, sizeof(**pa)); ****pppp = 50; (***pppp)[1] = 100; (***pppp)++; printf("****pppp = %d, (***pppp)[-1] = %d\n", ****pppp, (***pppp)[-1]);
主要还是在于如何理解解引用,++操作只能用于指针变量,而*p与**pa却明确指向一个数组,如果*p++或者**pa++的话,gcc编译器会出现:
error: lvalue required as increment operand
这样的错误,然而p与*pa指向一个数组的首地址,如果使用++或--的话,就会有跨度,即直接跨过数组地址长度而指向下一块,对的,有点块的感觉。
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