Output of two-dimensional arrays--(pointer output and pointer array output)

When I first saw the two names of the array pointer and array of pointers, I thought it was a thing, and when I saw the English explanation, I knew the two were different.

Pointer array: array of pointers, which is used to store pointers to arrays, that is, array elements are pointers

Array pointer: A pointer to an array, pointer to array, array can be of any dimension

The following examples illustrate:
int A[3][4]---> This needless to say, is a two-dimensional array.

int (*p) [4]---> is equivalent to int p[][4], which is a pointer to a two-dimensional array that can point to a two-dimensional array with a second dimension of 4.

Directly on the code:

　　1, two-dimensional array of pointer output:

1#include <iostream>2#include <algorithm>3#include <cstdio>4 using namespacestd;5 intMain () {6     inta[3][4] = {0,1,2,3,4,5,6,7,8,9,Ten, One};7     int*p, I, J;8p = &a[0][0];//or P = a[0]; //or P = * (a+0);//or P = *a;9      for(inti =0; I <3; ++i) {Ten          for(intj =0; J <4; ++j) { Oneprintf ("%4d", *p++); A         } -printf ("\ n"); -     } the     return 0;  -}

　　2, two-dimensional array of pointer array output:

1#include <iostream>2#include <algorithm>3#include <cstdio>4 using namespacestd;5 intMain () {6     inta[3][4] = {0,1,2,3,4,5,6,7,8,9,Ten, One};7     int(*p) [4], I, J; 8p =A;9      for(inti =0; I <3; ++i) {Ten          for(intj =0; J <4; ++j) { Oneprintf ("%4d", * (* (p + i) +j)); A         } -printf ("\ n"); -     } the     return 0;  -}

　　3. Input and output a two-dimensional array of any row:

1#include <iostream>2#include <algorithm>3#include <cstdio>4 using namespacestd;5 voidInput (int*a,intMintN) {6printf ("Please enter a two-dimensional array of%d rows and%d columns: \ n", M, n);7      for(inti =0; I < m; ++i)8          for(intj =0; J < N; ++j)9scanf ("%d", A + I * n + j);//or scanf ("%d", &a[i*n+j]);Ten } One voidPrint (int*a,intMintN) { A      for(inti =0; I < m; ++i) { -          for(intj =0; J < N; ++j) -printf ("%4d", * (A + i * n + j));//or printf ("%4d", A[i * n + j]); theprintf ("\ n"); -     } - } - intMain () { +     inta[2][4], b[3][3];//two arrays can be set to the maximum value, the input size is considered -Input (*a,2,4);//or input (A, 2, 4);//or input (a[0], 2, 4); //or input (a[0][0], 2, 4)//////input (A, 2, 4) No, OH; +Input (*b,3,3); Aprintf"Array a:\n"); atPrint (a[0],2,4); -printf ("Array b:\n"); -Print (b[0],3,3); -     return 0; - } -  in /* - Please enter a two-dimensional array of 2 rows and 4 columns: to 1 2 3 4 + 5 6 7 8 - Please enter a two-dimensional array of 3 rows and 3 columns: the 1 2 3 * 4 5 6 $ 7 8 9Panax Notoginseng Array A: - 1 2 3 4 the 5 6 7 8 + Array B: A 1 2 3 the 4 5 6 + 7 8 9 - */

　　Almost, again meet worth record again Add.

Output of two-dimensional arrays--(pointer output and pointer array output)