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Added rational numbers #711

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zxq9 wants to merge 28 commits from github/fork/radrow/frac into lima
pull from: github/fork/radrow/frac
merge into: QPQ-AG:lima
Conversation 1 Commits 28 Files Changed 18 +9 -6
1 changed files with 9 additions and 6 deletions
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15
priv/stdlib/Frac.aes
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@ -38,11 +38,14 @@ namespace Frac =
Zero => "0"
function simplify(f : frac) : frac =
let cd = gcd(num(f), den(f))
switch(f)
Neg(n, d) => Neg(n / cd, d / cd)
Neg(n, d) =>
let cd = gcd(n, d)
Neg(n / cd, d / cd)
Zero => Zero
Pos(n, d) => Pos(n / cd, d / cd)
Pos(n, d) =>
let cd = gcd(n, d)
Pos(n / cd, d / cd)
function make_frac(n : int, d : int): frac =
if (d == 0) abort("Division by zero")
@ -83,7 +86,7 @@ namespace Frac =
function from_int(n : int) : frac =
if (n > 0) Pos(n, 1)
elif (n < 0) Neg(n, 1)
elif (n < 0) Neg(-n, 1)
else Zero
function floor(f : frac) : int = switch(f)
@ -111,8 +114,8 @@ namespace Frac =
let cl = ceil(f)
let dif_fl = abs(sub(f, from_int(fl)))
let dif_cl = abs(sub(f, from_int(cl)))
if (dif_fl > dif_cl) cl
elif (dif_cl > dif_fl) fl
if (gt(dif_fl, dif_cl)) cl
elif (gt(dif_cl, dif_fl)) fl
elif (fl mod 2 == 0) fl
else cl