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It's quite common for AND to have a higher precedence than OR and for them both to be left-to-right associative. In that case. cond1 AND cond2 AND cond3 OR cond4 AND cond5 AND cond 6. would be equivalent to: ((cond1 AND cond2) AND cond3) OR ((cond4 AND cond5) AND cond 6) edited May 29, 2013 at 4:49.
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:
3. From wikipedia on boolean logic: In such cases [of ambiguity], parentheses may be used to clarify the order of operations. As always, the operations within the innermost pair is performed first, followed by the next pair out, etc., until all operations within parentheses have been completed. Then any operations outside the parentheses are ...
2. There is a logical order to evaluation of the query text, but the database engine can choose what order execute the query components based upon what is most optimal. The logical text parsing ordering is listed below. That is, for example, why you can't use an alias from SELECT clause in a WHERE clause.
61. This depends on the language, but in C style languages % is the same precedence as * and /. This means that if it appears in the same expression (without parentheses) the order depends on the associativity. In this case % is usually left-associative, so the operators will be executed in left-to-right order. answered Jun 24, 2010 at 21:48.
This confuses the mathematician in me: in arithmetic, we would say it has precedence over arithmetic operators. On its right, the ** operator does not have precedence over arithmetic operations, but it has on its left... For example, 5*2**2 == 5*(2**2).
4. There are three basic Boolean operators: NOT, AND, OR. XOR is just a simple version of A AND NOT B OR NOT A AND B or (A OR NOT B) AND (NOT A OR B). So, only these three have common precedence: NOT > AND > OR. XOR has different position in languages, but it has surely not higher precedence than AND and not lower than OR.
The order of python operations follows the same rules. You can remember it using the mnemonic " please excuse my dear aunt Sally." or PEMDAS when executing math. PEMDAS stands for Parenthesis, Exponentiation, Multiplication, Division, Addition, and Subtraction.
The C++ Operator Precedence cppreference page contains the order of all operations in c++. It's a bit hard to digest all at once, but for simple mathematical operations you are concerned about row #5 and #6. So yes, you can say that C++ somewhat follows PEMDAS, except, it doesn't have an exponent operator (see std::pow). But to clarify ...
vaultah's answer addresses your actual question perfectly -- they deserve the upvote and checkmark.. But I think programming blackjack in every language you're learning is an excellent way to better understand it, so I threw together code to show a different way to implement the blackjack test.