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red = (1<<0)
amber = (1<<1)
green = (1<<2)
light = 0; // off
light = light | red; // turn red ON
light = light | amber;// turn amber ON, red is still ON
light = light & ~(red | amber); // turn them both off again
x = 11001010 (dec 202; hex CA; oct 312)
y = x << 3;
y = 01010000;
z= x >> 2;
z= 110010;