performs simple arithmetic functions.
The only byte-oriented arithmetic function on the SPU is absdb, "absolute difference of bytes," which gives the absolute value of the difference between two operands.
ALU：Arithmetic Logic Unit; the circuitry within the CPU which performs all arithmetic functions.
You should make each different arithmetic function its own action/method/whatevertheframeworkcallsit and you should use the frameworks input validation for the form values (if it has one).
On the arithmetic functional equation φ(n)=s(n~7)
