Page 24 -

elseif expression 2
Commands 2 evaluated if expression 2 is True
elseif expression 3
Commands 3 evaluated if expression 3 is True
…
else
Commands evaluated if no other expression is True
end

In this form, only the commands associated with the first True expression
encountered are evaluated; ensuing relational expressions are not tested.

1.5.2.1 Alternative Syntax to the if Statement
As an alternative to the if syntax, we can use, in certain instances, Boolean
expressions to specify an expression in different domains. For example,
(x>=l) has the value 1 if x is larger than or equal to 1 and zero otherwise;
and (x<=h) is equal to 1 when x is smaller than or equal to h, and zero oth-
erwise.
The relational operations allowed inside the parentheses are: ==, <=, >=,
~=, <, >.

Homework Problem

Pb. 1.2 For the values of integer a going from 1 to 10, using separately the
methods of the if syntax and the Boolean alternative expressions, find the
values of C if:

C = a 2 for a < 3
a
C =+ 5 for 3 ≤ a < 7
C = a for a ≥ 7

Use the stem command to graphically show C.

1.6 Array Operations

In the above examples, we used for loops repeatedly. However, this kind of
loop-programming is very inefficient and must be avoided as much as possi-

© 2001 by CRC Press LLC