c++二维数组

二维数组初始化

int arr[2][3] = {{1, 2, 3},{4, 5, 6}};
int arr2[2][3] = {1, 2, 3, 4, 5, 6};
int arr3[][3] = {{1, 2, 3},{4, 5, 6}};

memset(arr, 0, sizeof(arr)); // 清空二维数组

行指针

int(*p)[3]; //p1是行指针，用于指向数组长度为3的int型数组
double(*p2)[5]; // p2是行指针，用于指向数组长度为3的double型数组

二维数组名是行地址

int arr[3][2] = {{1, 2},{4, 6}, {7,9}};
int(*p)[2] = arr;

二维数组做函数参数

#include <iostream>
#include<string>
#include<cstring>
using namespace std;

// void fun(int p[][2], int len) {
void fun(int(*p)[2], int len) {
    for (size_t i = 0; i < len; i++)
    {
        for (size_t j = 0; j < 2; j++)
        {
            cout << "p["<<i<<"]"<<"["<<j<<"] ="<<p[i][j] << "   ";
        }
        cout << endl;
    }
    
}

int main() {
    int arr[3][2] = {{1, 2},{4, 6}, {7,9}};
    fun(arr, 3);
    return 0;   
}