Initialization of Array in defination

Array can be initialized in definition by normal way as below

int a[5] = { 1, 1, 1, 1, 1};

Another a good way to fill the array with 0 using static

static int a[5]; which fills up the array with 0s
or int a[5] = {0}; fills all elements of the array with 0;

Another very good way to fill the array with different values when using gcc compiler is as below

int a[10] = {[0-2] = 5, [3-9] = 7};

which fills all the array element with 5 and 7s.