bitwise masks

#include <stdio.h>
int main()
{
    unsigned int y, mask1, mask2, left, right, result;
    y = 0xA2A3B4B6;
    mask1 = 0xFFFF0000;
    mask2 = 0x0000FFFF;
    left = y & mask1;
    printf("%#x\n", left);
    right = y & mask2;
    printf("%#x\n", right);
    left = left >> 16;
    printf("%#x\n", left);
    right = right << 16;
    printf("%#x\n", right);
    result = right | left;
    printf("%#x\n", result);
    return 0;

}