如何申报在C可变大小的二维数组？ [英] How to declare a variable size 2D array in C?

问题描述

我有一个项目出现问题。我必须做出一个可变大小的二维数组用于存储一些prediction error..so这是关于图像。麻烦的是，我需要加载不同大小的图像，以便为每个图像，我将不得不进入搜索您的问题中的二维数组pixels..I've的coresponding号文件，但它不是我要找for.Can谁能帮助我？

I have a problem with a project. I have to make a variable size 2D array for storing some prediction error..so this is about images. The trouble is that I have to load images of different sizes so for each image I would have to get into a file the 2D array with the coresponding number of pixels..I've searched among your questions but it's not what I'm looking for.Can anyone help me?

感谢您

推荐答案

如果你有一个现代的C编译器（至少C99）的功能范围很简单：

If you have a modern C compiler (at least C99) in function scope it is as simple as:

unsigned arr[n][m];

这就是所谓的可变长度阵列（VLA）。它可能有问题，如果数组过大。所以，如果您有大量的图像，你可以这样做：

this is called a variable length array (VLA). It may have problems if the array is too large. So if you have large images you could do:

unsigned (*arr)[m] = malloc(sizeof(unsigned[n][m]));

和后来

free(arr);

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