Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Manual de usuario descargar pdf (Pagina 16)

Chapter 4: Operators File-based Decoding User Manual

10 LeCroy Corporation

When operators of equal precedence occur in an expression, the operands are evaluated

according to the associativity of the operators. This means that if an operator's

associativity is left to right, then the operations is done starting from the left side of the

expression. So, the expression

4 + 9 - 6 + 5

would evaluate to 12. However, if the associative

operator is used to group a part or parts

of the expression, those parts are evaluated first. Therefore,

( 4 + 9 ) - ( 6 + 5 )

has a value of 2.

In Table 4.1, Operator Precedence and Associativity, the operators are listed in order of

precedence, from highest to lowest. Operators on

the same line have equal precedence,

and their associativity is shown in the second column.

Operator Symbol Associativity

++ --

Right to left

[] ()

Left to right

~ ! sizeof head tail first next more

last prev

Right to left

* / %

Left to right

+ -

Left to right

<< >>

Left to right

< > <= >=

Left to right

== !=

Left to right

= += -= *= /= %= >>= <<= &= ^= |=

Right to left

Table 4.1 Operator Precedence and Associativity

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 81 82

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Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Manual de usuario Pagina 16