小编dav*_*ave的帖子

我正在研究如何借助指针显示2D数组的元素.这是我试过的代码:

#include<stdio.h>  

int main(){

    int arr[3][2] = {  

    {7, 8},
    {6,3},
    {3,4}
    };

    printf("%u\n", (arr + 2));
    printf("%u\n", *(arr + 2)); 
}

输出:

6487616
6487616

我期待的输出*(arr + 2)是3.它怎么样(arr + 2)？

我正在创建一个简单的数据库,它是用于学习目的的表:

这是我的PHP代码(script.php)

<?php

$sql = file_get_contents("init.sql");

$servername = "localhost";
$username = "root";
$password = "";
  // connect to database
$conn = new mysqli($servername, $username, $password);

if ($conn->connect_error) {
    die("Connection error: " . $conn->connect_error);
}


 if($conn->query($sql) == True){
   echo "Database and Table has been created succesfully!";
 }

 else {
   echo "\nError creating database and table:  . $conn->error";
 }

 ?>

这是mysql文件(init.mysql)

CREATE DATABASE test;
  USE test;

  CREATE TABLE  Users (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) …