Questions If my belief that functions are always evaluated from left-to-right is wrong, what does the table referring to function precedence and associativity really mean? Who defines operator precedence and associativity if it's not ANSI? If it is ANSI who makes the definition, why is little mentioned about operator precedence and associativity?
In the normal set of boolean connectives (from a logic standpoint), and is higher-precedence than or, so A or B and C is really A or (B and C). Wikipedia lists them in-order.
28 Arithmetic operators Concatenation operator Comparison conditions IS [NOT] NULL, LIKE, [NOT] IN [NOT] BETWEEN Not equal to NOT logical condition AND logical condition OR logical condition You can use parentheses to override rules of precedence.
This distinguishes between && having higher precedence and || having higher precedence, but does not distinguish between || having higher precedence and && and || having equal precedence. Remember that if operators are equal in precedence they are simply evaluated left-to-right.
6 Of the boolean operators the precedence, from weakest to strongest, is as follows: or and not x is not; not in Where operators are of equal precedence evaluation proceeds from left to right.
Ruby 2.1.0, 2.0, 1.9, 1.8 An operator is a token that represents an operation (such as addition or comparison) to be performed on one or more operands. The operands are expressions, and operators allow us to combine these operand expressions into larger expressions. (Ref) N = arity = The number of operands the operator operates on. (Ref) A = associativity = The order of evaluation when the ...
Operator precedence in C is specified by the order the various operator groups appear in the standard (chapter 6.5). This is tedious reading, a "precedence table" that quickly sums up all operators would be preferable, particularly as reference for programming discussions on SO. If we could make such a post and use as a C FAQ, that would be great.
The order Python operators are executed in is governed by the operator precedence, and follow the same rules. Operators with higher precedence are executed before those with lower precedence, but operators have matching precedence when they are in the same group. For 10-7//2*3+1, you have 2 classes of operators, from lowest to higest:
Operator precedence dictates the grouping between operators and their operands (i.e. operator precedence says which operand belongs to which operator). Meanwhile, order of evaluation is a completely different story.
A friend asked me to explain the difference between operator precedence and order of evaluation in simple terms. This is how I explained it to them :- Let's take an example - int x; int a = 2; int ...
