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. for more gcc manual http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Designated-Inits.html