C/C++ 二维数组
使用C语言用到了二维数组
1 #include <iostream> 2 #include <stdlib.h> 3 using namespace std; 4 5 void print_arr_fun1(int arr[][3], int row){ 6 for (int i = 0; i < row; ++i){ 7 for (int j = 0; j < 3; ++j) 8 cout << arr[i][j] << " "; 9 cout << endl; 10 } 11 } 12 13 void print_arr_fun2(int *arr, int row, int col){ 14 for (int i = 0; i < row; ++i){ 15 for (int j = 0; j < col; ++j) 16 cout << *(arr + i * row + j) << " "; 17 cout << endl; 18 } 19 } 20 21 void print_arr_fun3(int **arr, int row, int col){ 22 for (int i = 0; i < row; ++i){ 23 for (int j = 0; j < col; ++j) 24 cout << arr[i][j] << " "; 25 cout << endl; 26 } 27 } 28 29 int main(){ 30 const int row = 2; //这里是const 31 const int col = 3; 32 int arr1[row][col]; 33 for (int i = 0; i < row; ++i) 34 for (int j = 0; j < col; ++j) 35 arr1[i][j] = i * col + j; 36 37 cout << "print_arr_fun1---------------------------" << endl; 38 print_arr_fun1(arr1, row); 39 cout << "print_arr_fun2---------------------------" << endl; 40 print_arr_fun2((int*)arr1, row, col); 41 42 cout << "print_arr_fun3---------------------------" << endl; 43 int **arr2 = (int**)malloc(sizeof(int*) * row); 44 //malloc 45 for (int i = 0; i < row; ++i) 46 arr2[i] = (int*)malloc(sizeof(int) * col); 47 for (int i = 0; i < row; ++i) 48 for (int j = 0; j < col; ++j) 49 arr2[i][j] = i * col + j; 50 print_arr_fun3(arr2, row, col); 51 52 //free 53 for (int i = 0; i < row; ++i) 54 free(arr2[i]); 55 free(arr2); 56 57 return 0; 58 }
输出:
print_arr_fun1--------------------------- 0 1 2 3 4 5 print_arr_fun2--------------------------- 0 1 2 2 3 4 print_arr_fun3--------------------------- 0 1 2 3 4 5
