Various small enhancements

1 files changed, 6 insertions, 5 deletions

diff --git a/Week7/src/polynomial/Polynomial.java b/Week7/src/polynomial/Polynomial.java
index f7b1194..f7f9860 100644
--- a/Week7/src/polynomial/Polynomial.java
+++ b/Week7/src/polynomial/Polynomial.java
@@ -116,7 +116,7 @@ public class Polynomial {
                 return;
             }
         }
-        terms.add(t);
+        terms.add(new Term(t));
     }
 
     /**
@@ -124,8 +124,9 @@ public class Polynomial {
      * @param p the polynomial to subtract
      */
     public void minus(Polynomial p) {
-        p.times(new Polynomial("-1 0"));
-        plus(p);
+        Polynomial temp = new Polynomial(p);
+        temp.times(new Polynomial("-1 0"));
+        plus(temp);
     }
 
     /**
@@ -136,7 +137,7 @@ public class Polynomial {
         Polynomial result = new Polynomial();
         for (Term that_t : p.terms) 
             for (Term this_t : terms)
-                result.plus(new Polynomial((that_t.getCoef() * this_t.getCoef()) + " " + (that_t.getExp() + this_t.getExp())));
+                result.plus(new Term(that_t.getCoef() * this_t.getCoef(), that_t.getExp() + this_t.getExp()));
         terms = result.terms;
     }
 
@@ -153,7 +154,7 @@ public class Polynomial {
         if (other_poly == null || other_poly.getClass() != getClass())
             return false;
         
-        Polynomial that = (Polynomial) other_poly;
+        Polynomial that = new Polynomial((Polynomial) other_poly);      // We need to copy because later we'll remove elements
         if (terms.size() != that.terms.size()) 
             return false;
         for (Term this_t : terms) {