I come across an example of a function as below:

```
int someFunction(void)
{
    int i;

    for(i = 0; i < 10; i++)
    {           
            a_var[i] = 0xFFFF; //uninitialize a_var
    }

    return 0;
}

```

What is the purpose of uninitialize a variable and why is it have to use 0XFFFF?