![]() These rules are called the “Order of Operations”. Operators are evaluated according to a strict set of rules. # **= exponentiation assignment (not all awk's) # |& redirection: coprocess (not all awk's) # >= relational: greater than or equal to # string concatenation has no explicit operator # All operators are left associative except: # A blank line separates groups of operators with equal precedence. # Operators are shown in decreasing order of precedence. This works for mathematical expressions too, since they are treated as normal function calls. But with a tiny asterisk: Your code will be evaluated from left to right, it is the expressions passed to your function calls that will be evaluated from right-to-left. The main expression evaluation order of Arturo is right-to-left. There is no need for operator precedence in Arturo, since all expressions are parsed/evaluated in the exact same way. Mixtures of numbers and numeric text are compared as per the class of the left operand.Īlso terms like is and is equal to. If the right operand can't be coerced to the left's class, the result is a list containing both operands.Īlso terms like is less than, is not greater than or equal to, etc. Sequences automatically parenthesised in compiled code.Īlso work with numeric text, giving integer or real results. ![]() Multiply, divide, integer division, remainderĬomparison, "is" checks a reference has a particular typeįrom the AppleScript Language Guide, plus additional notes: ALGOL 68 C indicates Cambridge University Algol 68.ALGOL 68 Rev0&1 indicates Algol 68 Revised Report (Essentially Revision 1).ALGOL 68 Rev0 indicates Algol 68 Final Report (Essentially Revision 0).Key: The super scripts indicate the following: Or a parallel clause can be used to force statements to be executed in parallel, e.g. if ~ then ~ elif ~ then ~ else ~ fi or simply "( ~ | ~ |: ~ | ~ | ~ )",Īnd (unlike C's comma operator) the " " can be used to indicate statements are done sequentially, where as the "," indicates that the statements can be done "collaterally", e.g.case ~ in ~ ouse ~ in ~ out ~ esac or simply "( ~ | ~ |: ~ | ~ | ~ )",.Note: Quaternaries include names skip and ~.Īlgol 68 also includes (something like) C's ternary conditions, e.g.: Note: Tertiaries include names nil and ○.Īssignation and identity relations etc Īgain, these are technically not operators, rather they are considered " units associated with names" Minus, plus, div, overb, modb, ÷::=, prus Minusab, plusab, timesab, divab, overab, modab, plusto, Standard dyadic operators with associated priorities priority , abs, arg, bin, entier, leng, level, odd, repr, round, shorten These are technically not operators, rather they are considered " units associated with names" The coder may define new operators and both those and the pre-defined ones may be overloaded and their priorities may be changed.Īrray, Procedure, Dereference, Selection and Generator operations priorityĭereferencing, deproceduring(~,~), subscripting, rowing & slicing "Operators and Expression Evaluation" contains the listing. Lowest: Reading at the specified address.Īda Reference Manual, ISO/IEC 8652:2012(E), section 4.5. The use of parentheses for these modes is required, and nicely illustrates the order of operations. LDA ($20),y uses the values store at $20 and $21 as a memory address, and reads the byte at that address + Y. LDA ($20,x) uses the values stored at $20+x and $21+x as a memory address, and reads the byte at that address. These differ in that the indirect X mode applies the offset before looking up the address. There are two types of indirect addressing: Indirect X and Indirect Y. In 8th it's very simple: the currently invoked word has precedence, and items are operated upon in the order they are popped off the stack. 6.4 Assignation and identity relations etc.6.3 Standard dyadic operators with associated priorities.6.1 Array, Procedure, Dereference, Selection and Generator operations.
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