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Adds Exponenciation #33

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Adds Exponenciation #33

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26 changes: 25 additions & 1 deletion src/arithmetic.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -43,4 +43,28 @@ end
# Division
/(x::Decimal, y::Decimal) = x * inv(y)

# TODO exponentiation
# Exponentiation, please test

function ^(x::Decimal, y::Decimal)
#(-1.23)^(something) code to catch errors prior to the routine
x.s == 1 && begin
(y.q < 0 && throw(DomainError(y),"Exponentiation yielding a complex result requires a complex argument."))
end
y.s == 1 && (return ^(inv(x),-y))
y.q < 0 && (return Decimal(BigFloat(x)^BigFloat(y))) #add correction to precision, its too much

if iseven(y.c) #squared number
zs = 0
else
if x.s == 0
zs =0
else
zs = 1
end
end

zc = x.c^((y.c)*(10^y.q))
zq = (x.q)*((y.c)*(10^y.q))
return Decimal(zs,zc,zq)

end