C++中定义一个二维数组

在C++中定义二维数组有很多种方式

1.第一种方式：定义一个二级指针(指向指针的指针)

#include <iostream>

using namespace std;
void Traverse(int** p);

int main() {
  // two-dimension array
  int m = 3, n = 5;
  int** arr = new int*[m];
  arr[0] = new int[n];
  arr[1] = new int[n];
  arr[2] = new int[n];
  for (int i = 0; i < m; i++) {
    for (int j = 0; j < n; j++) {
      arr[i][j] = 10;
    }  
  }
  Traverse(arr);
  
  for (int i= 0; i < 3; i++) {
     delete[] arr[i];
     arr[i] = nullptr;
  }
  delete[] arr;
  arr = nullptr;
  
  return 0;
}

void Traverse(int** p) {
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 5; j++) {
      cout << p[i][j] << " ";
    }
    cout << endl;
  }
}