如何初始化结构的2d对象数组。 [英] How to initialize 2d object array of strucuture.

问题描述

但是当我访问Structure的属性时我得到了异常，我使用的代码在下面



我尝试了什么：



i有结构名称吉他，代码用于创建2D对象吉他对象

吉他**吉他手=（吉他**）malloc（ sizeof （吉他*））; 
  for （ int  i =  0 ; i< row; i ++）
 {
 guitarlists [i] =（Guitar *）malloc（ sizeof （吉他））; 
} 
 

解决方案

引用：

吉他** guitarlists =（吉他**）malloc（sizeof（吉他*））;

应该是

吉他**吉他手=（吉他**）malloc（行 *  sizeof （吉他*））; 

[update]

As Thaddeus Jones 正确指出out，如果你需要一个吉他的二维数组，那么你必须修改

引用：

guitarlists [i] =（吉他*）malloc（sizeof（吉他））;

以及。

[/ update]





请注意：因为你显然使用 C ++ ，为什么不使用 C ++ 编程语言和标准库功能（例如容器）？

如果你想要 r <的二维数组/ var> rows和 c 列，你可以这样做：

吉他** guitarlists =（吉他* *）malloc（r * sizeof（吉他*））; 
 for（int i = 0; i< r; i ++）
 {
 guitarlists [i] =（Guitar *）malloc（c * sizeof（Guitar））; 
} 

在C ++中，使用newnew和delete运算符是标准的：

< pre lang =c ++>吉他* guitarlists = 新吉他[row]; // 普通数组
delete guitarlists;

或者我错过了一些位？

but when i access the attributes of Structure i get the exception, the code i used is below

What I have tried:

i have structure name "Guitar", code that is used to create 2 D array of Guitar Objects

Guitar ** guitarlists = (Guitar **)malloc(sizeof(Guitar *));
 for (int i = 0; i < row; i++)
 {
     guitarlists[i] = (Guitar *)malloc(sizeof(Guitar));
 }

解决方案

Quote:

Guitar ** guitarlists = (Guitar **)malloc(sizeof(Guitar *));

That should be

Guitar ** guitarlists = (Guitar **)malloc(row * sizeof(Guitar *));

[update]
As Thaddeus Jones correctly pointed out, if you need a bidimensional array of Guitar then you have to modify

Quote:

guitarlists[i] = (Guitar *)malloc(sizeof(Guitar));

as well.
[/update]


Please note: since you apparently are using C++, why don't you use C++ programming language and standard library features (e.g. containers)?

If you want a 2D array of r rows and c columns, you can do this:

Guitar ** guitarlists = (Guitar **)malloc(r* sizeof(Guitar *));
for (int i = 0; i < r; i++)
{
	guitarlists[i] = (Guitar *)malloc(c * sizeof(Guitar));
}

In C++ it is standard to use the "new" new and delete operators like that:

Guitar *guitarlists = new Guitar[row];//normal array
delete guitarlists; 

Or am I missing some bits?

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