如何使用数组文件声明动态数组和2D数组

问题描述

嗨^ _ ^

我们可以输入

Hi ^_^
we can type

array <int , 10> s = {0};

声明一维数组，现在我该如何声明一个二维数组用这种方式？另一方面，
如何使用这种方式声明动态数组（我的意思是让用户在运行程序后输入数组长度的方法是什么（1D和2D数组）） ？





非常感谢提前。

to declaration a 1D array, now how do I can declare a 2D array using this way ?
on the other hand how do i can declare a dynamic array using this way (I mean what is the way to let user type the length of the array after running the program (1D and 2D array)) ?


many thanks in advance.

推荐答案

#include <array>
...
using namespace std;
...
enum { OUTER = 3, INNER = 2 };

array<array<int, INNER>, OUTER> a =  { {{ 1, 2 }, { 3, 4 }, { 5, 6 }} } ;

for(size_t outer = 0; outer < OUTER; ++outer) {
	for(size_t inner = 0; inner < INNER; ++inner) {
		cout << "a[" << outer << "][" << inner << "] = " << a[outer][inner] << endl;
	}
}

结果：

a[0][0] = 1
a[0][1] = 2
a[1][0] = 3
a[1][1] = 4
a[2][0] = 5
a[2][1] = 6

除了外括号之外，您可以将所有元素保留为平面元素序列。



参见 []和引用的 []修复缺陷。



For动态数组你可以使用嵌套 std :: vector s。

问候

Andi

You may leave away all but the outer braces and initialize the array as flat sequence of elements.

See also http://stackoverflow.com/questions/17759757/multidimensional-stdarray[^] and the referenced C++14 proposal[^] to fix that "defect".

For dynamic "arrays" you may use nested std::vectors.
Regards
Andi

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