#18 ==演算子、int型との四則演算を実装

OUCC · Jun 13, 2022 · 872f997 · 872f997
1 parent df2f142
commit 872f997
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Showing 2 changed files with 73 additions and 18 deletions.
diff --git a/lib/model/fruction.dart b/lib/model/fruction.dart
@@ -1,9 +1,16 @@
 class Fruction {
   int Numerator, Denominator;
   Fruction(this.Numerator, this.Denominator) {
-    final numrator = this.Numerator;
+    if (Denominator == 0) {
+      throw ArgumentError("分母が0になっています");
+    } else if (Denominator < 0) {
+      Denominator *= -1;
+      Numerator *= -1;
+    }
     Reduce();
   }
+
+  ///約分する
   void Reduce() {
     int gcd = Gcd(Numerator, Denominator);
     Numerator = (Numerator / gcd).toInt();
@@ -15,6 +22,7 @@ class Fruction {
     return "$Numerator/$Denominator";
   }
 
+  ///最大公約数を求める
   int Gcd(int a, int b) {
     return ((a % b) == 0) ? b : Gcd(b, (a % b));
   }
@@ -25,27 +33,65 @@ class Fruction {
     result = 31 * result + Numerator.hashCode;
     result = 31 * result + Denominator.hashCode;
     return result;
+    //return Object.hash(Numerator, Denominator);
+  }
+
+  //以下演算子のオーバーロード
+  Fruction operator +(dynamic a) {
+    if (a.runtimeType == Fruction) {
+      Fruction i = a;
+      return Fruction(Numerator * i.Denominator + i.Numerator * Denominator,
+          Denominator * i.Denominator);
+    } else if (a.runtimeType == int) {
+      int i = a;
+      return Fruction(Numerator + i * Denominator, Denominator);
+    } else {
+      throw ArgumentError("無効な計算です");
+    }
   }
 
-  Fruction operator +(Fruction i) {
-    return Fruction(
-        this.Numerator * i.Denominator + i.Numerator * this.Denominator,
-        this.Denominator * i.Denominator);
+  Fruction operator -(dynamic a) {
+    if (a.runtimeType == Fruction) {
+      Fruction i = a;
+      return Fruction(Numerator * i.Denominator - i.Numerator * Denominator,
+          Denominator * i.Denominator);
+    } else if (a.runtimeType == int) {
+      int i = a;
+      return Fruction(Numerator - i * Denominator, Denominator);
+    } else {
+      throw ArgumentError("無効な計算です");
+    }
   }
 
-  Fruction operator -(Fruction i) {
-    return Fruction(
-        this.Numerator * i.Denominator - i.Numerator * this.Denominator,
-        this.Denominator * i.Denominator);
+  Fruction operator *(dynamic a) {
+    if (a.runtimeType == Fruction) {
+      Fruction i = a;
+      return Fruction(i.Numerator * Numerator, i.Denominator * Numerator);
+    } else if (a.runtimeType == int) {
+      int i = a;
+      return Fruction(Numerator * i, Denominator);
+    } else {
+      throw ArgumentError("無効な計算です");
+    }
   }
 
-  Fruction operator *(Fruction i) {
-    return Fruction(
-        i.Numerator * this.Numerator, i.Denominator * this.Numerator);
+  Fruction operator /(dynamic a) {
+    if (a.runtimeType == Fruction) {
+      Fruction i = a;
+      return Fruction(
+          this.Numerator * i.Denominator, this.Denominator * i.Numerator);
+    } else if (a.runtimeType == int) {
+      int i = a;
+      return Fruction(Numerator, Denominator * i);
+    } else {
+      throw ArgumentError("無効な計算です");
+    }
   }
 
-  Fruction operator /(Fruction i) {
-    return Fruction(
-        this.Numerator * this.Denominator, this.Denominator * i.Numerator);
+  @override
+  bool operator ==(dynamic a) {
+    return a is Fruction &&
+        a.Denominator == Denominator &&
+        a.Numerator == Numerator;
   }
 }
diff --git a/test/model/fraction_test.dart b/test/model/fraction_test.dart
@@ -1,12 +1,21 @@
+import 'dart:math';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:calculator2022/model/fruction.dart';
 
 void main() {
-  test("fruction_test", () {
+  test("fruction_and_fruction", () {
     final A = Fruction(2, 3);
     final B = Fruction(4, 3);
     final result = A / B;
-    //result.Reduce();
-    print(result);
+    final anser = Fruction(1, 2);
+    expect(result, anser);
+  });
+
+  test("fructionfruction_and_int", () {
+    final A = Fruction(2, 3);
+    final B = 3;
+    final result = A / B;
+    Fruction anser = Fruction(2, 9);
+    expect(result, anser);
   });
 }