Answer:
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Boolean Expressions
We need to look at the condition part of the if statement.
Usually this is a boolean expression.
Recall that an expression is
is a combination of literals, operators, variable names, and
parentheses used to calculate a value.
A boolean expression is an expression that evaluates to true or false.
Boolean expressions often compare numbers. A relational operator says how the numbers are compared.
| Relational Operators | |
|---|---|
| Operator | Meaning |
| A == B | is A equal to B ? |
| A < B | is A less than B ? |
| A <= B | is A less than or equal to B ? |
| A > B | is A Greater than B ? |
| A >= B | is A Greater than or equal to B ? |
| A != B | is A not equal to B ? |
Here are some annoying details (that will be really annoying later on if you forget about them):
- The operator for "equal" is
==(two equal signs in a row). In your web browser it may be hard to see that there are two equal signs. - The operator for "not equal" is
!=(exclaimation point equal sign).
It is easy to forget these two details,
and easy to overlook these details in a program.
You might spend hours debugging a program because
a = was used
where a == belongs.
QUESTION 13: