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ALU: addition, subtraction, multiplication, division
code-golf arithmetic
Challenge
Given two integers \$a, b\$ in \$[0, 256)\$ and a number \$c\$ from the set \$\{0, 1, 2, 3\}\$, perform an operation corresponding to \$c\$.
If \$c\$ is 0, output \$a + b \pmod{256}\$.
If \$c\$ is 1, output \$a -...