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IF x<3 THEN
x
2
ELSE
1-x
END
While this simple construct works fine when your function has only two
branches, you may need to nest IF…THEN…ELSE…END constructs to deal with
function with three or more branches. For example, consider the function
Here is a possible way to evaluate this function using IF… THEN … ELSE …
END constructs:
IF x<3 THEN
x
2
ELSE
IF x<5 THEN
1-x
ELSE
IF x<3π THEN
sin(x)
ELSE
IF x<15 THEN
exp(x)
ELSE
-2
END
END
END
END
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⎪
⎪
⎩
⎪
⎪
⎪
⎨
⎧
−
<≤
<≤
<≤−
<
=
elsewhere
xifx
xifx
xifx
xifx
xf
,2
153),exp(
35),sin(
53,1
3,
)(
2
3
π
π