Array Initialization

Here i am discussing how many ways we can initialize the array in
the 'C' language

Normal initialization

int arr[10] = { 0, 1, 2, 3 , 4, 5, 6, 7, 8, 9 };

This is very normal way of initialization of the array.

-->Let say there is a situation that all of the array elements holds the same
element.Different ways to initialize that is

int arr[ 10] = {0,0,0,0,0,0,0,0,0,0,}; /* this is not a good way */
int arr[10] = {0}; /* Good Practice */

--> let say there is another situation where an array of length "10"
which contains some elements up to index 4 ( means 5 elements)
after that the array contains only zeros.

int arr[10] = {1,12,3,4,5,0,0,0,0,0}; /* This is not good practice */
int arr[10] = { 1,12,3,4,5}; /* rest filled with zeros. */

--> Let say there is another strange situation where first 3 elements in array
holds same value and next 2 elements hold the same value.

int arr[10] = {4,4,4,7,7,1,2,3,4,5}; /* This is normal initialization */
int arr[10] = {[0 ... 2]=4,[3 ... 4]=7,1,2,3,4,5}; /* This is good practice */

--> Let say there is another situation where 3rd element holds 90 ,
8th element holds 100 and rest all holds the zeros.

int arr[10] = {0,0,90,0,0,0,0,100,0,0};/* General practice */
int arr[10] = {[2]=90, [7]=100};/* Good practice */