Variables and Assignment Statements
Read this chapter, which covers variables and arithmetic operations and order precedence in Java.
24. Unary Minus
Answer:
2 + 4/2 + 1
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2 + 2 + 1
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4 + 1
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5
Unary Minus
If you look in the operators, table of table of operators you will see that the character -
is listed twice. That is because -
is used for two purposes. In some contexts, -
is the unary minus operator. In other contexts, -
is the subtraction operator.
The unary minus is used to show a negative number. For example:
-97.34
means "negative ninety seven point thirty four." The subtraction operator is used to show a subtraction of one number from another. For example:
95 - 12
asks for 12 to be subtracted from 95.
The unary minus operator has high precedence. Addition and subtraction have low precedence. For example
-12 + 3
means add 3 to negative 12 (resulting in -9). The unary minus is done first, so it applies only to the twelve.
unary plus +
can be applied to a number to show that it is positive. It also has high precedence. It is rarely used.
Question 25:
What is the value of the following expression?
+24 + 3 * -4