Question

I have an array of int and i have to initialize this array with the value -1. For now i use this loop:

int i;
int myArray[10];

for(i = 0; i < 10; i++)
    myArray[i] = -1;

There are faster ways?

Answer 1

The quickest way I know for the value -1 (or 0) is memset:

int v[10];
memset(v, -1, 10 * sizeof(int));

Anyway you can optimize the loop in this way:

int i;
for(i = 10; i--;)
    v[i] = -1;