Bitshift and equals together

Question

What does >>= do in this example?

byte fsr = 2;
fsr >>= 2; 

I came across it here: https://github.com/sparkfun/MMA8452_Accelerometer/blob/master/Firmware/MMA8452Q_BasicExample/MMA8452Q_BasicExample.ino

Answer 1

It does this:

fsr = fsr >> 2;

Answer 2

fsr >>= 2;

is

fsr = fsr >> 2;

In Bitwise Context, two bit places to the right is being shifted.

In Arithmetic context, the number in fsr is being divided by 2^2(4);