programming-for-dummies

186
Picking Three or More Choices with the IF-THEN-ELSEIF Statement
Checking a condition for each set of commands
The IF-THEN-ELSEIF statement only runs a command (or block of commands)
if some condition is True, as shown in Figure 4-3.
Command
True
Comparison
operation
False
Command
True
Comparison
operation
False
Figure 4-3:
An IF-THEN-
ELSEIF
statement
offers two
different
sets of
commands
to follow.
Command
Command
If every conditional expression is False, the IF-THEN-ELSE statement
doesn’t run any commands. Only if one of its conditional expressions is True
does the IF-THEN-ELSE statement run exactly one set of commands, such as
IF (Salary > 100000) THEN
TaxRate = 0.45
ELSEIF (Salary > 50000) THEN
TaxRate = 0.30
END IF
In this example, the computer has three possible choices:
✦ If Salary > 100000, set TaxRate = 0.45.
✦ If Salary > 50000 (but less than 100000), set TaxRate = 0.30.
✦ If Salary