Week 4 Although Java has the rule that the left operand of every binary operator

Question

Week 4

Although Java has the rule that the left operand of every binary operator is evaluated before the right operand, most languages give the compiler the freedom to choose which operand is evaluated first. When expressions have side effects, the value of the expression can be different depending upon which order is used. Give an example in C++ of an expression whose value depends upon the evaluation order. Show the orders that produce different values and the values they produce. Explain what side effect is the expression contains

Explanation / Answer

Operators are tokens that are used to combine values in expressions. When evaluating an expression, Java uses precedence and associativity rules to determine the order in which operators are applied. These rules mostly are derived from the C language precedence and associativity rules.

An assignment expression is most often used for its side effect: it changes the value of the variable selected by the variable expression to the value of the expression on the right-hand side. The value of the assignment expression is the value that is assigned to the selected variable.

In most common assignment expressions, the assignment operator is =. Then the assignment expression has the following form.

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