如何阵列分成用C两个数组 [英] How to split array into two arrays in C

问题描述

说我有C中的数组

int array[6] = {1,2,3,4,5,6}

我怎么能分裂成

{1,2,3}

和

{4,5,6}

请问使用的memcpy这是可能的？

Would this be possible using memcpy?

感谢你，

NONONO

推荐答案

当然。这种简单的解决方法是使用的malloc ，然后用的memcpy 来将数据复制到两个数组分配两个新的阵列。

Sure. The straightforward solution is to allocate two new arrays using malloc and then using memcpy to copy the data into the two arrays.

int array[6] = {1,2,3,4,5,6}
int *firstHalf = malloc(3 * sizeof(int));
if (!firstHalf) {
  /* handle error */
}

int *secondHalf = malloc(3 * sizeof(int));
if (!secondHalf) {
  /* handle error */
}

memcpy(firstHalf, array, 3 * sizeof(int));
memcpy(secondHalf, array + 3, 3 * sizeof(int));

然而，如果原来的数组存在足够长的时间，你甚至不需要这么做。通过使用指针到原来的数组，你可以只'分裂'的阵列分为两个新的数组：

However, in case the original array exists long enough, you might not even need to do that. You could just 'split' the array into two new arrays by using pointers into the original array:

int array[6] = {1,2,3,4,5,6}
int *firstHalf = array;
int *secondHalf = array + 3;

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