programming-for-dummies

184
Picking Two Choices with the IF-THEN-ELSE Statement
Picking Two Choices with the
IF-THEN-ELSE Statement
The simple IF-THEN statement either runs a command (or block of commands)
or it doesn’t. But what if you want the computer to take one action if
something is True and a completely different action if something is False?
In that case, you must use a variation — an IF-THEN-ELSE statement.
The IF-THEN-ELSE statement gives the computer a choice of two mutually
exclusive choices, as shown in Figure 4-2.
Command
True
Comparison
operation
False
Figure 4-2:
An IF-THEN-
ELSE
statement
offers two
different
sets of
commands
to follow.
Command
Command
Command
Like the simple IF-THEN statement, the IF-THEN-ELSE statement can run a
single command or a block of commands, such as
if (True or False) then
{
command #1
command #2
.
.
command #3
}
else
{
command #1