有人可以用非常简短的方式详细说明我吗？ [英] Can please someone elaborate me this in very brief manner?

问题描述

int * arr = new int [size];



我没有得到这个暗示的东西。



我的尝试：



如果我将值从0更改为10，会有什么不同？我的意思是这样做

大小会影响这个吗？这一切意味着什么？

int *arr=new int[size];

I am not getting what this thing is implying.

What I have tried:

What will be the difference if i change the value from 0 to 10? What i mean is this do
size will affect this? And what it all means ?

推荐答案

引用：

会有什么区别如果我将值从0更改为10？

What will be the difference if i change the value from 0 to 10?

什么值？没有0！



查看代码行，并将其分解：

What value? There is no "0"!

Look at the line of code, and break it down:

int *arr=new int[size];

int                        Integers are involved.
int *                      It's a pointer to an intger
int *arr                   The is called "arr" and it holds a pointer to an integer
int *arr=new               We want a new lump of memory allocated at run time.
int *arr=new int           The new memory will be integer(s)
int *arr=new int[...]      The new memory is an array of integers
int *arr=new int[size]

在运行时分配一个整数数组 - size 的内容表示有多少整数数组将保持，并存储指向 arr中的第一个元素的指针

Allocate at run time an array of integers - the contents of size says how many integers the array will hold, and store a pointer to the first element in arr

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