什么方括号意味着数组初始化用C？

问题描述

static uint8_t togglecode[256] = {
    [0x3A] CAPSLOCK,
    [0x45] NUMLOCK,
    [0x46] SCROLLLOCK
};

什么是的意义[0x3A] 在这里？我只学会了像 INT语句[2] = {1，2};

What's the meaning of [0x3A] here? I have only learned statements like int a[2] = {1, 2};

推荐答案

这意味着初始化的 N 的-th数组的元素。你给出的例子将意味着：

It means initialise the n-th element of the array. The example you've given will mean that:

togglecode[0x3A] == CAPSLOCK
togglecode[0x45] == NUMLOCK
togglecode[0x46] == SCROLLLOCK

这些被称为，并且实际C99标准的一部分。然而，如果没有语法 = 不是。从该页面：

These are called "designated initializers", and are actually part of the C99 standard. However, the syntax without the = is not. From that page:

这一个可选的语法，因为GCC 2.5这已经过时了，但GCC仍然接受是写 [指数] 元素值，没有 = 。

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