lab 06

src/ca/bcit/comp3760/lab06/Lab6.java

@@ -0,0 +1,85 @@
+package ca.bcit.comp3760.lab06;
+
+public class Lab6
+{
+    public long SW_Recursive(final int m, final int n)
+    {
+        if (m < 0 || n < 0)
+        {
+            throw new IllegalArgumentException("m and n must be non-negative");
+        }
+
+        if (m == 0 || n == 0)
+        {
+            return 1;
+        }
+
+        return this.SW_Recursive(m - 1, n) + this.SW_Recursive(m, n - 1);
+    }
+
+    public void RunRecursive(final int lower, final int upper)
+    {
+        for (int i = lower; i <= upper; ++i)
+        {
+            final long start;
+            final long end;
+            final long result;
+
+            start = System.currentTimeMillis();
+            result = this.SW_Recursive(i, i);
+            end = System.currentTimeMillis();
+
+            System.out.printf("SW_Recursive(%d,%d) = %d, time is %d ms\n",
+                    i, i, result, end - start);
+        }
+    }
+
+    public long SW_DynamicProg(final int m, final int n)
+    {
+        final long[][] table;
+
+        if (m < 0 || n < 0)
+        {
+            throw new IllegalArgumentException("m and n must be non-negative");
+        }
+
+        table = new long[m + 1][n + 1];
+
+        for (int row = 0; row <= m; ++row)
+        {
+            table[row][0] = 1;
+        }
+
+        for (int col = 0; col <= n; ++col)
+        {
+            table[0][col] = 1;
+        }
+
+        for (int row = 1; row <= m; ++row)
+        {
+            for (int col = 1; col <= n; ++col)
+            {
+                table[row][col] = table[row - 1][col] + table[row][col - 1];
+            }
+        }
+
+        return table[m][n];
+    }
+
+    public void RunDynamicProg(final int lower, final int upper)
+    {
+        for (int i = lower; i <= upper; ++i)
+        {
+            final long start;
+            final long end;
+            final long result;
+
+            start = System.currentTimeMillis();
+            result = this.SW_DynamicProg(i, i);
+            end = System.currentTimeMillis();
+
+            System.out.printf("SW_DynamicProg(%d,%d) = %d, time is %d ms\n",
+                    i, i, result, end - start);
+        }
+    }
+}

src/ca/bcit/comp3760/lab06/Lab6Driver.java

@@ -0,0 +1,27 @@
+package ca.bcit.comp3760.lab06;
+
+public class Lab6Driver
+{
+    public static void main(final String[] args)
+    {
+        final Lab6 d;
+
+        d = new Lab6();
+
+        System.out.println("Recursive:");
+        d.RunRecursive(0, 5);
+
+        System.out.println();
+        System.out.println("Dynamic Programming:");
+        d.RunDynamicProg(0, 10);
+
+        System.out.println();
+        System.out.println("My donuts");
+        d.RunRecursive(37, 37);
+        d.RunDynamicProg(37, 37);
+        d.RunRecursive(3737, 3737);
+        d.RunDynamicProg(3737, 3737);
+        d.RunRecursive(10000037, 10000037);
+        d.RunDynamicProg(10000037, 10000037);
+    }
+}