adition: All basic operations

src/lib.rs

@@ -30,7 +30,11 @@ impl Fraction {
             return Err(FractionError::ZeroDenominator);
         }
 
-        Ok(Fraction { num, den })
+        let mut new = Fraction { num, den };
+
+        new.reduce();
+
+        Ok(new)
     }
 
     pub fn reciprocal(&self) -> Result<Self, FractionError> {
@@ -56,37 +60,68 @@ impl Fraction {
     fn reduce(&mut self) {
         todo!();
     }
+
+    fn correct_sign(&mut self) {
+        todo!()
+    }
 }
 
 impl ops::Mul for Fraction {
     type Output = Self;
 
-    fn mul(self, rhs: Self) -> Self::Output {
-        todo!()
+    fn mul(self, other: Self) -> Self::Output {
+        let mut new = Fraction {
+            num: self.num * other.num,
+            den: self.den * other.den,
+        };
+        new.reduce();
+        new
     }
 }
 
 impl ops::Add for Fraction {
     type Output = Self;
 
-    fn add(self, rhs: Self) -> Self::Output {
-        todo!()
+    fn add(self, other: Self) -> Self::Output {
+        let mut new = Fraction {
+            num: (self.num * other.den) + (self.den * other.num),
+            den: self.num * other.den,
+        };
+        new.reduce();
+        new.correct_sign();
+        new
     }
 }
 
 impl ops::Div for Fraction {
     type Output = Result<Self, FractionError>;
 
-    fn div(self, rhs: Self) -> Self::Output {
-        todo!()
+    fn div(self, other: Self) -> Self::Output {
+        if other.is_zero() {
+            return Err(FractionError::DivisionByZero);
+        }
+
+        let mut new = Fraction {
+            num: self.num * other.den,
+            den: self.den * other.num,
+        };
+        new.reduce();
+        new.correct_sign();
+        Ok(new)
     }
 }
 
 impl ops::Sub for Fraction {
     type Output = Self;
 
-    fn sub(self, rhs: Self) -> Self::Output {
-        todo!()
+    fn sub(self, other: Self) -> Self::Output {
+        let mut new = Fraction {
+            num: (self.num * other.den) - (self.den * other.num),
+            den: self.num * other.den,
+        };
+        new.reduce();
+        new.correct_sign();
+        new
     }
 }
 
@@ -94,7 +129,10 @@ impl ops::Neg for Fraction {
     type Output = Self;
 
     fn neg(self) -> Self::Output {
-        todo!()
+        Fraction {
+            num: -self.num,
+            den: self.den,
+        }
     }
 }