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Update wikipage Conditional expression. (Signed-off-by:alexk).

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[[Property:uuid|C652AC71-8BAD-4387-A46C-21C9F5C3A68F]]
[[Property:weight|0]]
[[Property:title|Conditional expression]]
[[Property:link_title|Conditional]]
= Conditional expression =
[[Eiffel%20Programming%20Language%20Syntax#Conditionals|Conditional expressions]] compute a value using different expressions depending on one or more conditions. If all expressions have the same type, the conditional expression as a whole has this type as well:
<e>
if time < noon then
"Good morning"
elseif time < evening then
"Good afternoon"
else
"Good evening"
end
</e>
has type `STRING`.
If the types of the expressions are different, the common ancestor type is used as a type of the whole expression.
<e>
if time < noon then
"Good morning"
else
Void
end
</e>
has type `detachable STRING`.