From ad601cadc21b6e0571341a156c439c5e35126c94 Mon Sep 17 00:00:00 2001
From: Bita <bitahajati1386@gmail.com>
Date: Sat, 25 Apr 2026 20:09:30 +0330
Subject: [PATCH] Complete the Rational

---
 src/main/java/Rational/Rational.java | 44 ++++++++++++----------------
 1 file changed, 18 insertions(+), 26 deletions(-)

diff --git a/src/main/java/Rational/Rational.java b/src/main/java/Rational/Rational.java
index 7bd840e..2222d5e 100644
--- a/src/main/java/Rational/Rational.java
+++ b/src/main/java/Rational/Rational.java
@@ -51,46 +51,38 @@ public class Rational {
         return r1.add(r2);
     }
 
-    // TODO: Instance method - this - other
     // Formula: a/b - c/d = (a*d - c*b) / (b*d)
     public Rational subtract(Rational other) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        int newNumerator = this.numerator * other.denominator - other.numerator * this.denominator;
+        int newDenominator = this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 - r2
-    public static Rational subtract(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
-    }
+    public static Rational subtract(Rational r1, Rational r2) { return r1.subtract(r2); }
 
-    // TODO: Instance method - this * other
     // Formula: (a/b) * (c/d) = (a*c) / (b*d)
     public Rational multiply(Rational other) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
+        int newNumerator = this.numerator * other.numerator;
+        int newDenominator = this.denominator * other.denominator;
+        return new Rational(newNumerator, newDenominator);
     }
 
-    // TODO: Static method - r1 * r2
-    public static Rational multiply(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
-    }
+    public static Rational multiply(Rational r1, Rational r2) { return r1.multiply(r2); }
 
-    // TODO: Instance method - this / other
     // Formula: (a/b) ÷ (c/d) = (a*d) / (b*c)
     public Rational divide(Rational other) {
-        // YOUR CODE HERE
-        // HINT: Division is multiplication by reciprocal
-        // Don't forget to check if other.numerator is zero!
-        return null; // Remove this line when implemented
+        if(other.numerator == 0) {
+            System.out.println("Error !");
+        }
+        else {
+            int newNumerator = this.numerator * other.denominator;
+            int newDenominator = this.denominator * other.numerator;
+            return new Rational(newNumerator, newDenominator);
+        }
+        return null;
     }
 
-    // TODO: Static method - r1 / r2
-    public static Rational divide(Rational r1, Rational r2) {
-        // YOUR CODE HERE
-        return null; // Remove this line when implemented
-    }
+    public static Rational divide(Rational r1, Rational r2) { return r1.divide(r2); }
 
     //  PROVIDED - String representation
     @Override