SDA Operator’s Manual
SDA-OM-E Rev H 255
Order of Calculations
Operations are performed in the following order:
1. Contents of brackets
2. Exponentiation
3. Division and multiplication
4. Addition and subtraction
If there is any doubt as to how the calculation will be done, use brackets. These will also make
the order of the calculations clear to any reader of the program, which is desirable if you are to
give it to a customer, who will want to know what was intended.
Here are some examples of the uses of brackets:
Brackets are worked out before any other operations are performed.
Use brackets to force the result you want, and also to clarify a
calculation.
A 1 1 1 1 1 1 1 1 255 0 1 0 1 1 0 1 0 90 (B OR C) AND (D OR E)
B 1 1 1 1 0 0 0 0 240 0 0 0 0 0 0 0 0 0 B OR (C AND D) OR E
C 1 0 1 0 1 0 1 0 130 1 1 1 1 1 0 1 0 250 B OR (C AND (D OR E))
D 0 1 0 1 0 1 0 1 85 0 1 0 1 1 1 1 1 95 ((B OR C) AND D) OR E)
E 0 0 0 0 1 1 1 1 15
F 0 0 0 0 0 0 0 0 0
A 7 315 A * B * (C / D) * E * F
B 6 8.75 A * B * C / (D * E * F)
C 5 35 A * B * (C / (D * E) ) * F
D 4
E 3
F 2
Check these results to see whether any errors, deliberate or otherwise, have been introduced.
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