programming-for-dummies

566
Looping Statements
The IF-ELSE statement only offers two choices. If you want to offer multiple
choices, you can use the IF-ELSEIF statement, which uses two or more
Boolean conditions to choose which of two or more groups of commands to
run. In Perl, use the ELSIF keyword, such as
if (condition1) {
Command;
Command;
}
elsif (condition2) {
Command;
Command;
}
elsif (condition3) {
Command;
Command;
}
In Python, use the ELIF keyword, such as
if (condition1):
Command
Command
elif (condition2):
Command
Command
elif (condition3):
Command
Command
Unlike other programming languages, neither Perl nor Python provides a
SWITCH statement.
Looping Statements
A looping statement repeats one or more commands for a fixed number of
times or until a certain Boolean condition becomes True. To create a loop that
repeats for a fixed number of times, use the FOR loop, which looks like this:
for (startvalue; endvalue; increment) {
Command;
}
If you wanted the FOR loop to run five times, you could set the Start value to
1 and the End value to 5, such as
for (i = 1; i