Page 485 - Introduction to Programming with Java: A Problem Solving Approach

11.8 Expression Evaluation Review 451 Try to evaluate the following expressions on your own prior to looking at the subsequent answers.
1. (c + a / b) / 10 * 5 2.a + b++
3.4 + --c
4. c = b = a % 2
Here are the answers:
1.
(c + a / b) / 10 * 5 ⇒ (3.0 + 5 / 2) / 10 * 5 ⇒ (3.0 + 2) / 10 * 5 ⇒
Mixed expression—the int gets promoted to a double.
5.0
0.5
2.5
2.
a
/ 10 * 5 ⇒ * 5 ⇒
b++ ⇒ 2⇒
--c ⇒ 2.0 ⇒
b = a % 2⇒ b = 5 % 2⇒ b = 1⇒ 1⇒
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/ and * have same precedence. Perform left operation first.
+
Use b’s original value of 2 in the expression. Afterwards, b’s value increments to 3.
5
7
+
3.
4
+
c’s value decrements to 2.0 before using it in the expression.
4
+
6.0
4.
c
=
Don’t plug in values for variables that are at the left of assignments.
c
=
c
c
=
=
Theb = 1assignment evaluates to 1.
c is a double, so the result is a double.
1.0