(internal) initial commit

1 files changed, 35 insertions, 0 deletions

diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..c53b959
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,35 @@
+pub struct Rational
+{
+    n: i64,
+    d: i64
+}
+
+fn gcd(a: i64, b: i64) -> i64
+{if b != 0 { gcd(b, a % b) } else { a }}
+
+impl Default for Rational
+{
+    fn default() -> Rational { Rational::from_int(0) }
+}
+
+impl Rational
+{
+    fn from_int(v: i64) -> Rational {Rational{n: v, d: 1}}
+    fn reduced(self) -> Rational
+    {
+        let c = gcd(self.n, self.d);
+        Rational{n: self.n / c, d: self.d / c}
+    }
+    fn add(self, other: Rational) -> Rational
+    {
+        let c = gcd(self.d, other.d);
+        Rational{n: self.n * (other.d / c) + other.n * (self.d / c),
+                 d: self.d / c * other.d}.reduced()
+    }
+    fn multiply(self, other: Rational) -> Rational
+    {
+        Rational{n: self.n * other.n, d: self.d * other.d}.reduced()
+    }
+    fn as_int_trunc(self) -> i64 {self.n / self.d}
+    fn as_int_round(self) -> i64 {(self.n as f64 / self.d as f64).round() as i64}
+}