C：确保你从一个数组返回元素是正确的 [英] C : Making sure the element you return from an array is correct

问题描述

假设我们有这一块 C code的：

Say we have this piece of C code:

int x[] = {1, 2, 3, 4, 5};

printf("%d", *(x + 1)); //prints 2
printf("%d", *(x + 500)); //prints 7209065 (...?)

你可以从第二个电话看，还是返回的东西...但它的垃圾。

As you can see from the second call, it still returns something...but it's garbage.

那么请问，你如何处理用C这样的情况？也就是说，你怎么知道，如果返回的元素是真正存在于数组或只是垃圾的因素呢？

So I ask, how do you handle such a case in C? ie, how do you know if the returned element is really an element that exists in the array or just garbage ?

推荐答案

添加持有数组的长度，只要你想访问数组确保您的数组的边界内的另一个变量。

Add another variable that holds the length of the array, and whenever you want to access the array make sure you are within the bounds of the array.

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