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Asked: 2026-05-31T18:44:06+00:00

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

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

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

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1 Answer

  1. Editorial Team

    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

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

    An alternative syntax for this which has been obsolete since GCC 2.5 but GCC still accepts is to write [index] before the element value, with no =.

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