是指针和数组用C有何不同？ [英] Are pointers and arrays any different in C?

问题描述

我正在写一个小的C程序做一些数字运算，它需要阵列绕过功能之间。职能应接受并返回指针，对吧？

I'm writing a small C program to do some number crunching, and it needs to pass around arrays between functions. The functions should accept and return pointers, right?

例如，这（我知道这可能不是最有效的东西）：

For example, this (I know it may not be the most efficient thing):

int* reverse(int* l, int len) {
    int* reversed = malloc(sizeof(*reversed)*len);
    int i, j;
    for (i = 0, j = len-1; i < len; i++, j--) {
        reversed[j] = l[i];
    }
    return reversed;
}

我是使用指针吧？

Am I using pointers right?

推荐答案

您code片段是正确的。然而，指针和数组在C是确有不同。简单的说指针类型T并不等同于T类型的数组。

Your code snippet is correct. However, pointers and arrays in C are indeed different. Put simply "the pointer to type T" is not same as "the array of type T".

请看看Ç常见问题解答讨论指针与放大器;阵列更好地理解这一点。

Please have a look at C Faq discussing Pointers & arrays to get a better understanding of this.

这篇关于是指针和数组用C有何不同？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！