void swap (int x[])
{
        int temp = x[0];
        x[0] = x[1];
        x[1] = temp;
}

int main()
{
        int num[2] = {111, 222};
        swap(num);
        printf("\n num[0]=[%d], num[1]=[%d]\n", num[0], num[1]);
        return(0);
}