x =((int)x 1 & lt； & lt24)+((int)x2 & lt； & lt 16)+((int)x3 & lt； & lt8)+((int)x4)；
Write as a macro:
# Definition change (x 1, x2, x3, x4) ((int) x1< & lt24)+((int)x2 & lt； & lt 16)+((int)x3 & lt； & lt8) + ((int)x4)
Call:
x = change(x 1，x2，x3，x4)；
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