如何将元素添加到C ++数组? [英] How to add element to C++ array?

问题描述

我想在数组中添加一个int，但是问题是我不知道现在的索引是什么.

I want to add an int into an array, but the problem is that I don't know what the index is now.

int[] arr = new int[15];
arr[0] = 1;
arr[1] = 2;
arr[2] = 3;
arr[3] = 4;
arr[4] = 5;

该代码起作用是因为我知道我要分配给哪个索引，但是如果我不知道该索引该怎么办...

That code works because I know what index I am assigning to, but what if I don't know the index...

在PHP中，我可以执行arr[]=22;，这将自动将22加到数组的下一个空索引中.但是在C ++中我无法做到这一点，它给了我一个编译器错误.你们有什么建议?

In PHP, I can just do arr[]=22;, which will automatically add 22 to the next empty index of the array. But in C++ I can't do that, it gives me a compiler error. What do you guys suggest?

推荐答案

在C ++中，纯数组无法完成您所说的事情.为此，C ++解决方案是使用STL库，该库为您提供 std::vector .

There is no way to do what you say in C++ with plain arrays. The C++ solution for that is by using the STL library that gives you the std::vector.

您可以通过以下方式使用vector:

You can use a vector in this way:

std::vector< int > arr;

arr.push_back(1);
arr.push_back(2);
arr.push_back(3);

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