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This chapter specifies the meanings of expressions and the rules for their evaluation.Evaluation of an expression can also produce side effects, because expressions may contain embedded assignments, increment operators, decrement operators, and method invocations.An expression denotes nothing if and only if it is a method invocation (§15.12) that invokes a method that does not return a value, that is, a method declared (§8.4).Such an expression can be used only as an expression statement (§14.8), because every other context in which an expression can appear requires the expression to denote something.An expression statement that is a method invocation may also invoke a method that produces a result; in this case the value returned by the method is quietly discarded.The value of an expression is assignment compatible (§5.2) with the type of the expression, unless heap pollution (§4.12.2) occurs.
Likewise, the value stored in a variable is always compatible with the type of the variable, unless heap pollution occurs.
In other words, the value of an expression whose type is , then there is a question as to what value set (§4.2.3) the value of the expression is drawn from.
Value set conversion (§5.1.13) is applied to the result of every expression that produces a value.
Each expression occurs in either: If an expression denotes a variable, and a value is required for use in further evaluation, then the value of that variable is used.
In this context, if the expression denotes a variable or a value, we may speak simply of the If an expression denotes a variable or a value, then the expression has a type known at compile time.
The rules for determining the type of an expression are explained separately below for each kind of expression.