c++ - 在函数中返回数组(Return array in a function)

Question

I have an array int arr[5] that is passed to a function fillarr(int arr[]) :

(我有一个数组int arr[5]传递给函数fillarr(int arr[]) ：)

int fillarr(int arr[])
{
    for(...);
    return arr;
}

1. How can I return that array?

   (如何返回该数组？)

2. How will I use it, say I returned a pointer how am I going to access it?

   (我将如何使用它，说我返回了一个指针，我将如何访问它？)

  ask by Ismail Marmoush translate from so

Answer 1

In this case, your array variable arr can actually also be treated as a pointer to the beginning of your array's block in memory, by an implicit conversion.

(在这种情况下，通过隐式转换，您实际上也可以将数组变量arr视为指向数组在内存中块的开头的指针。)

This syntax that you're using:

(您使用的语法如下：)

int fillarr(int arr[])

Is kind of just syntactic sugar.

(只是一种语法糖。)

You could really replace it with this and it would still work:

(您可以用它替换它，它仍然可以工作：)

int fillarr(int* arr)

So in the same sense, what you want to return from your function is actually a pointer to the first element in the array:

(因此，从同样的意义上说，您要从函数中返回的内容实际上是指向数组中第一个元素的指针：)

int* fillarr(int arr[])

And you'll still be able to use it just like you would a normal array:

(而且您仍然可以像使用普通数组一样使用它：)

int main()
{
  int y[10];
  int *a = fillarr(y);
  cout << a[0] << endl;
}