Parenthesized expressions ( )
Use parentheses to explicitly force the order of expression evaluation.
The following expression does not use parentheses to group operands
and operators. The parentheses surrounding 
weight, zipcode are
used to form a function call. Note how the compiler groups the operands
and operators in the expression according to the rules for operator
precedence and associativity:The following expression is similar to the previous expression,
but it contains parentheses that change how the operands and operators
are grouped:
In an expression that contains both associative and commutative
operators, you can use parentheses to specify the grouping of operands
with operators. The parentheses in the following expression guarantee
the order of grouping operands with the operators:
x = f + (g + h);Related information