Packing 4 Integers as ONE BYTE?

Question

I have four integers {a, b, c, d} that can have the following range of values:

a - {0 or 1} (1 bi

Answer 1

def encode(a, b, c, d):
  return a | b << 1 | c << 2 | d << 5

def decode(x):
  return x & 1, (x >> 1) & 1, (x >> 2) & 7, (x >> 5) & 7