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Of course, you can use parentheses either to circumvent the precedence rules or to make your intentions clearer. In the following, for example, the parentheses are not essential: the result produced without parentheses is the same as the result with parentheses. Nevertheless, many programmers insert parentheses anyway, just to make the expression's meaning absolutely clear:
6 + 3 * 2 <-- Value is clearly 18 (6 + 3) * 2 <-- Value is even more clearly 18