指针与数组

#include <iostream>#include <iomanip>using namespace std;void main(){#define DIM2#ifdef DIM2int sz[2][3] = {1, 2, 3,4, 5, 6};int *pa = sz[0];//{1, 2, 3}int *pb = sz[1];//{4, 5, 6}int *pc[2] = {pa, pb};//指针数组, 是个数组int (*pd)[3] = sz;//数组名式指针, 是个指针: 数组名为sz, 那这个sz是什么类型呢？答案: int (*pd)[3]for (int i = 0; i < 2; i++){for (int j = 0; j < 3; j++){//cout << setw(4) << *(sz[i] + j);//cout << setw(4) << *(pa + 3*i + j);cout << setw(4) << *(*(pd +i) + j);}cout << endl;}#elseint sz[2][3][4] = { 1,  2,  3,  4, 5,  6, 7,  8, 9, 10, 11, 12,13, 14, 15, 16,17, 18,19, 20,21, 22, 23, 24};int *pa = sz[0][0];//{1, 2, 3, ...., 11, 12}int *pb = sz[1][0];//{13, 14, ....., 23, 24}int *pc[2] = {pa, pb};//指针数组, 是个数组int (*pd)[3][4] = sz;//数组名式指针, 是个指针for (int i = 0; i < 2; i++){for (int j = 0; j < 3; j++){for (int k = 0; k < 4; k++){//cout << setw(4) << *(*(sz[i] + j) + k);//cout << setw(4) << *(pa + 3*4*i + 4*j + k);cout << setw(4) << *(*(*(pd + i) + j) + k);}cout << endl;}cout << endl;}#endif}#include <iostream>using namespace std;void main(){int a[] = {1, 2, 3, 4, 5};int *p1 = (int *)(&a) + 1;int *p2 = (int *)(&a + 1);//这里的 +1 表示加上 1个a[5]数组的长度cout << *(a + 1)  << endl;//2cout << *(p1 + 3) << endl;//5cout << *(p2 - 2) << endl;//4}