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main.cpp
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140 lines (99 loc) · 2.59 KB
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#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char **argv)
{
/* 三维指针 [2][3][4] */
int*** pa = new int**[2];
for (int i = 0; i < 2; i++) {
*(pa + i) = new int*[3];
for (int j = 0; j < 3; j++) {
*(*(pa + i) + j) = new int[4];
for(int k = 0; k < 4; k++) {
*(*(*(pa + i) + j) + k) = i * j * k;
printf("pa[%d][%d][%d]: %d\n", i, j, k, *(*(*(pa + i) + j) + k));
}
}
}
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 3; j++) {
delete[] *(*(pa + i) + j);
}
delete[] *(pa + i);
}
delete[] pa;
int* (*paa)[10] = new int*[2][10];
for (unsigned int i = 0; i < 2; i++) {
for (unsigned int j = 0; j < 10; j++) {
*(*(paa + i) + j) = new int;
*(*(*(paa + i) + j)) = i * j;
printf("paa[%d][%d]: %d\n", i, j, *(*(*(paa + i) + j)));
}
}
for (unsigned int i = 0; i < 2; i++) {
for (unsigned int j = 0; j < 10; j++) {
delete *(*(paa + i) + j);
}
}
delete[] paa;
/* 2 * 10 */
int** paaa = new int*[2];
*paaa = new int[2 * 10];
for (unsigned int i = 1; i < 2; i++ ) {
*(paaa + i) = *(paaa + i - 1) + 10; //重新分配地址， 10表示向后int*向后移动10个位置(10 * sizeof(int))
}
for (unsigned int i = 0; i < 2; i++ ) {
for (unsigned int j = 0; j < 10; j++) {
*(*(paaa + i) + j) = i * j;
printf("paaa[%d][%d]: %d\n", i, j, *(*(paaa + i) + j));
}
}
delete[] *paaa;
delete[] paaa;
int (*pppp)[10] = new int[2][10]; // return int(*)[10]
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 10; j++) {
*(*(pppp + i) + j) = i * j;
}
}
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 10; j++) {
printf("pppp[%d][%d]: %d\n", i, j, *(*(pppp + i) + j));
}
}
typedef int array_t[10];
array_t *pp = new array_t[2];
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 10; j++) {
*(*(pp + i) + j) = i + j;
printf("pp[%d][%d]: %d\n", i, j, *(*(pp + i) + j));
}
}
delete[] pp;
// int [10][1] == int* [10]
int **ppp = new int*[10];
for (unsigned int i = 0; i < 10; i++) {
*(ppp + i) = new int;
*(*(ppp + i)) = i;
printf("ppp[10][0]: %d\n", *(*(ppp + i)));
}
for (unsigned int i = 0; i < 10; i++) {
delete *(ppp + i);
}
delete[] ppp;
// int (*)[1]
int (*ppppp)[1] = new int[10][1];
for (unsigned int i = 0; i < 10; i++) {
*(*(ppppp + i)) = i;
printf("ppppp[%d]: %d\n", i, *(*(ppppp + i)));
}
delete[] ppppp;
typedef int pppppp_t[1];
pppppp_t *pppppp = new pppppp_t[10];
for (unsigned int i = 0; i < 10; i++) {
*(*(pppppp + i)) = i;
printf("pppppp[%d]: %d\n", i, *(*(pppppp + i)));
}
system("pause");
return 0;
}