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thirty_one?

Decimal
examples
negative number
input
-2.0.thirty_one?
result
false
negative number
input
-2.1.thirty_one?
result
false
negative number
input
-1.0.thirty_one?
result
false
negative number check
input
-1.1.thirty_one?
result
false
negative_decimal_point_one_thirty_one_check
input
-0.1.thirty_one?
result
false
zero point zero thirty_one check
input
0.0.thirty_one?
result
false
negative decimal point one thirty one check
input
-0.1.thirty_one?
result
false
one point zero thirty one check
input
1.0.thirty_one?
result
false
negative number check
input
-1.1.thirty_one?
result
false
negative number
input
-2.0.thirty_one?
result
false
two point one
input
2.1.thirty_one?
result
false
thirty one true
input
31.0.thirty_one?
result
true
thirty one point one
input
31.1.thirty_one?
result
false