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，但问题是我现在不知道索引是什么.

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;

该代码有效，因为我知道要分配给哪个索引，但是如果我不知道该索引怎么办...

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

在 PHP 中，我可以只做 arr[]=22;，它会自动将 22 添加到数组的下一个空索引.但是在 C++ 中我不能这样做，它给了我一个编译器错误.大家有什么建议?

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

使用普通数组无法实现您在 C++ 中所说的那样.对此的 C++ 解决方案是使用 STL 库，该库为您提供 std::矢量.

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.

你可以这样使用vector:

#include <vector>

std::vector< int > arr;

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

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