你可以调整初始化后的C ++数组？ [英] Can you resize a C++ array after initialization?

问题描述

我学习编程，和C ++是我的第一语言。不要刻意使用指针告诉我 - 我不明白他们着呢，不会打扰，直到我有更多的时间奉献给这个

I'm learning to program, and C++ is my first language. Don't bother using pointers to show me - I don't understand them yet, and won't bother until I have more free time to dedicate to this.

    int mergeSort()
{
    const int n = 9;
    int originalarray[n] = {1, 3, 5, 7, 9, 2, 4, 6, 8};


    const int halfelements = (sizeof(originalarray) / sizeof(int)) / 2;
    int farray[halfelements];
    int sarray[halfelements];

    for (int i = 0; i < halfelements; i++) {
        farray[i] = originalarray[i];
    }

    for (int i = halfelements, x = 0; i < (halfelements * 2); i++, x++) {
        sarray[x] = originalarray[i];
    }

我被分配（我不上课 - 刚刚与几个朋友帮助我学习）合并排序算法，该算法解释，但没有实现。我想改写这个所以它会为奇数和偶数工作。我尝试添加该code：

I was assigned (I'm not taking classes - just learning with a few friends helping me out) a merge sort algorithm, with the algorithm explained but not the implementation. I want to rewrite this so it will work for both odd and even integers. I tried adding this code:

if ((n % 2) != 0) int farray[halfelements + 1];

所以，我可以用相同的整数迭代双方随后阵列。一个的sizeof（farray）是显示为16个字节，或4个整数。因此它不改变大小。我想知道的 - 是否有可能调整他们的数组初始化后，？

So that I could use the same integer to iterate over both subsequent arrays. A sizeof(farray) is showing to be 16 bytes, or 4 integers. So it isn't resizing. What I want to know - is it possible to resize arrays after they initialized?

编辑：我将如何实现一个载体？我不知道如何使用迭代器在一个循环遍历并复制值。

How would I implement a vector? I don't understand how to use iterators in a loop to iterate over and copy the values.

推荐答案

C ++数组大小是固定的。

C++ arrays are fixed in size.

如果你需要一个可调整大小的数组，你要使用的std ::矢量而不是阵列。

If you need a "resizable array", you'll want to use std::vector instead of an array.

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