分配数组的值未初始化 [英] value of allocated array not initialized

问题描述

如果我有

int array[20];

array [0] 的值是什么(如果尚未初始化)?有没有办法检查它是否已经初始化?

What is the value of array[0] if nothing has been initialized there yet? Is there a way to check if it has been initialized?

推荐答案

"...假设我有..."您有哪里?

"...suppose I have..." You have it where?

如果在命名空间范围内有类似的内容，则它是一个具有静态存储持续时间的对象，该对象始终为零初始化.

If you have something like this in namespace scope, then it is an object with static storage duration, which is always zero-initialized.

如果在本地范围内有这样的对象，则它是一个具有自动存储持续时间的对象，该对象根本没有初始化. array [0] 的值是不可预测的.不，没有办法告诉您是否已对某些内容进行了初始化.

If you have something like this in local scope, then it is an object with automatic storage duration, which is not initialized at all. The value of array[0] is unpredictable. And no, there's no way to tell whether something has been deliberately initialized or not.

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