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eighty?

Decimal
examples
check if eighty
input
-2.0.eighty?
result
false
negative two point one
input
-2.1.eighty?
result
false
check if eighty
input
-1.0.eighty?
result
false
negative one point one
input
-1.1.eighty?
result
false
minus zero point one eighty
input
-0.1.eighty?
result
false
zero point zero
input
0.0.eighty?
result
false
minus zero point one eighty
input
-0.1.eighty?
result
false
one point zero
input
1.0.eighty?
result
false
negative one point one
input
-1.1.eighty?
result
false
minus two point zero eighty
input
-2.0.eighty?
result
false
two point one
input
2.1.eighty?
result
false
eighty check true
input
80.0.eighty?
result
true
eighty point one check
input
80.1.eighty?
result
false