Week 7 framework + startzip

2 files changed, 213 insertions, 0 deletions

diff --git a/Week7/src/polynomial/Polynomial.java b/Week7/src/polynomial/Polynomial.java
new file mode 100644
index 0000000..3b327f4
--- /dev/null
+++ b/Week7/src/polynomial/Polynomial.java
@@ -0,0 +1,86 @@
+package polynomial;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+/**
+ * A skeleton class for representing Polynomials
+ *
+ * @author Sjaak Smetsers
+ * @date 10-03-2015
+ */
+public class Polynomial {
+
+    /**
+     * A polynomial is a sequence of terms here kept in an List
+     */
+    List<Term> terms;
+
+    /**
+     * A constructor for creating the zero Polynomial zero is presented as an
+     * empty list of terms and not as a single term with 0 as a coefficient
+     */
+    public Polynomial() {
+        terms = new ArrayList<>();
+    }
+
+    /**
+     * A Constructor creating a polynomial from the argument string.
+     *
+     * @param s a String representing a list of terms which is converted to a
+     * scanner and passed to scanTerm for reading each individual term
+     */
+    public Polynomial( String s ) {
+        terms = new ArrayList<>();
+        Scanner scan = new Scanner(s);
+
+        for (Term t = Term.scanTerm(scan); t != null; t = Term.scanTerm(scan)) {
+            terms.add(t);
+        }
+    }
+
+    /**
+     * The copy constructor for making a deep copy
+     *
+     * @param p the copied polynomial
+     *
+     */
+    public Polynomial( Polynomial p ) {
+        terms = new ArrayList<>(p.terms.size());
+        for (Term t : p.terms) {
+            terms.add(new Term(t));
+        }
+    }
+    
+    /**
+     * A straightforward conversion of a Polynomial into a string based on the
+     * toString for terms
+     *
+     * @return a readable string representation of this
+     */
+    @Override
+    public String toString() {
+        return null;
+    }
+
+    public void plus(Polynomial b) {
+    }
+
+
+    public void minus(Polynomial b) {
+    }
+
+
+    public void times(Polynomial b) {
+    }
+
+    public void divide(Polynomial b) {
+    }
+
+    @Override
+    public boolean equals(Object other_poly) {
+        return false;
+    }
+
+}
diff --git a/Week7/src/polynomial/Term.java b/Week7/src/polynomial/Term.java
new file mode 100644
index 0000000..67bcf04
--- /dev/null
+++ b/Week7/src/polynomial/Term.java
@@ -0,0 +1,127 @@
+package polynomial;
+
+import java.util.Scanner;
+
+/**
+ * For representing terms in a polynomial.
+ *
+ * @author Sjaak Smetsers
+ * @version 1.0
+ * @date 15-02-2012
+ */
+public class Term {
+
+    /**
+     * Each term consists of a coefficient and an exponent
+     */
+    private double coefficient;
+    private int exponent;
+
+    /**
+     * a get-method for the exponent
+     *
+     * @return exponent
+     */
+    public int getExp() {
+        return exponent;
+    }
+
+    /**
+     * a get-method for the coefficient
+     *
+     * @return coefficient
+     */
+    public double getCoef() {
+        return coefficient;
+    }
+
+    /**
+     * A two-argument constructor
+     *
+     * @param c the value for the coefficient
+     * @param e the value for the exponent
+     */
+    public Term(double c, int e) {
+        coefficient = c;
+        exponent = e;
+    }
+
+    /**
+     * A copy-constructor
+     *
+     * @param t the term to be copied
+     */
+    public Term(Term t) {
+        this(t.coefficient, t.exponent);
+    }
+
+    /**
+     * For adding two terms with equal exponents
+     *
+     * @param t the term added to this
+     * @require exponent == t.exponent
+     */
+    public void plus(Term t) {
+        coefficient += t.coefficient;
+    }
+
+    /**
+     * For multiplying two terms
+     *
+     * @param t the multiplier
+     */
+    public void times(Term t) {
+        exponent += t.exponent;
+        coefficient *= t.coefficient;
+    }
+
+    /**
+     * Converts a term into a readable representation the standard format is
+     * %fx^%d
+     *
+     * @return the string representing the term
+     */
+    @Override
+    public String toString() {
+        if (exponent == 0) {
+            return String.format("%f", coefficient, exponent);
+        } else if (exponent == 1) {
+            return String.format("%fx", coefficient, exponent);
+        } else {
+            return String.format("%fx^%d", coefficient, exponent);
+        }
+    }
+
+    /**
+     * Standard implementation of equality
+     */
+    @Override
+    public boolean equals(Object may_be_term) {
+        if (may_be_term == null || getClass() != may_be_term.getClass()) {
+            return false;
+        } else {
+            Term term = (Term) may_be_term;
+            return exponent == term.exponent
+                    && coefficient == term.coefficient;
+        }
+    }
+
+    /**
+     * A static method for converting scanner input into a term. The expected
+     * format is two numbers (coef, exp) separated by whitespaces. The coef
+     * should be either an integer or a decimal number. The exp is an integer.
+     *
+     * @param s the scanner providing the input
+     * @return null if no term could be found, the found term otherwise
+     */
+    public static Term scanTerm(Scanner s) {
+        String coef_patt = "\\-?\\d+(\\.\\d+)?";
+        if (s.hasNext(coef_patt)) {
+            String coef = s.next(coef_patt);
+            int exp = s.nextInt();
+            return new Term(Double.parseDouble(coef), exp);
+        } else {
+            return null;
+        }
+    }
+}