这是一个指向数组开头的指针的指针吗? [英] Is this a pointer to a pointer of the start of an array?

问题描述

我只是在帮助某人处理一些代码.他有这个:

I've just been helping someone out with some code. He had this:

char dataArray[10];

然后想得到一个指向数组开头的指针.而不是使用:

Then wanted to get a pointer to the start of the array. Rather than use:

&dataArray[0]

或者只是

dataArray

他用过

&dataArray

他最终得到了一个指向那里的指针的指针吗?我不确定 &dataArray 会给他什么.

Did he end up with a pointer to a pointer there? I'm not sure what &dataArray would give him.

推荐答案

• &dataArray[0] 是 char * 类型.这是一个指向 char 的指针.
• dataArray 是 char[10]
类型
• &dataArray 的类型为 char (*)[10].这是一个指向数组的指针.
• &dataArray[0] is of type char *. That is a pointer to char.
• dataArray is of type char[10]
• &dataArray will be of type char (*)[10]. That is a pointer-to-array.

除此之外，值将是相同的，即它们指向相同的地址但它们的类型不需要兼容.

Apart from that, the value will be same, i.e., they point to the same address but their types need not be compatible.

这里没有一个是指针到指针.它们只是不同类型的指针.

None of them is a pointer-to-pointer here. They are just pointer with different types.

^{注意:由于数组的衰减特性，char [100] 会衰减为char *，例如作为函数的参数传递时.}

^{Note: Because the array decaying property, char [100] will decay to a char *, for example, when passed as an agument of a function.}

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