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Part 3 Precedences of operators

# Part 3 Precedences of operators - Precedences of operators...

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Precedences of operators You know that multiplication * takes precedence over addition +, e.g. the expression 5 + 4 * 3 is evaluated as if it were parenthesized like this: 5 + (4 * 3). Mathematics has conventions for precedences of operators in order to reduce the number of parentheses required in writing complex expressions. Some of these conventions are standard throughout the world —like * over +. Others are not. Below is a table of precedences for Java operators. Refer to this table, or the one on p. 227 of Gries/Gries, if you forget the precedences. Table of operator precedences ORDER OPERATORS EXAMPLES Highest Unary ops: + – ++ –– ! Binary arithmetic ops. * / % Binary arithmetic ops. + – Arithmetic relations: < > <= >= Equality relations: == != Logical and: && Lowest Logical or: || For example, the expression (n != 0) && (10/n > 2) can be easily rewritten as n != 0 && 10/n > 2 because relational operators have precedence over &&. Keep redundant parentheses to a minimum (but don't sacrifice clarity) Your goal in writing expressions should be to make them a clear and simple-looking as

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