addtition: tryfrom and from

src/lib.rs

@@ -160,13 +160,16 @@ impl fmt::Display for Fraction {
 
 impl From<i32> for Fraction {
     fn from(value: i32) -> Self {
-        todo!()
+        Fraction {
+            num: value.into(),
+            den: 1,
+        }
     }
 }
 
 impl From<i64> for Fraction {
     fn from(value: i64) -> Self {
-        todo!()
+        Fraction { num: value, den: 1 }
     }
 }
 
@@ -174,7 +177,14 @@ impl TryFrom<(i32, i32)> for Fraction {
     type Error = FractionError;
 
     fn try_from(value: (i32, i32)) -> Result<Self, Self::Error> {
-        todo!()
+        if value.1 == 0 {
+            return Err(FractionError::ZeroDenominator);
+        }
+
+        Ok(Fraction {
+            num: value.0.into(),
+            den: value.1.into(),
+        })
     }
 }
 
@@ -182,7 +192,14 @@ impl TryFrom<(i64, i64)> for Fraction {
     type Error = FractionError;
 
     fn try_from(value: (i64, i64)) -> Result<Self, Self::Error> {
-        todo!()
+        if value.1 == 0 {
+            return Err(FractionError::ZeroDenominator);
+        }
+
+        Ok(Fraction {
+            num: value.0,
+            den: value.1,
+        })
     }
 }