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twenty_eight?

Decimal
examples
negative two point zero
input
-2.0.twenty_eight?
result
false
negative two point one
input
-2.1.twenty_eight?
result
false
negative one point zero
input
-1.0.twenty_eight?
result
false
negative one point one
input
-1.1.twenty_eight?
result
false
negative zero point one
input
-0.1.twenty_eight?
result
false
zero point zero
input
0.0.twenty_eight?
result
false
negative zero point one
input
-0.1.twenty_eight?
result
false
one point zero
input
1.0.twenty_eight?
result
false
negative one point one
input
-1.1.twenty_eight?
result
false
negative two point zero
input
-2.0.twenty_eight?
result
false
two point one
input
2.1.twenty_eight?
result
false
twenty eight
input
28.0.twenty_eight?
result
true
twenty eight
input
28.1.twenty_eight?
result
false