Lab 009 Completed

README.md

@@ -16,7 +16,8 @@
     * Is the **blank** object mutable or immutable? How can you tell?
 
 ```text
-PUT ANSWER TO #2 HERE
+The blank object is mutable because it is a Point object and it's instances can be modified
+such as when it's x and y values were changed.
 ```
 
 ```java
@@ -47,7 +48,9 @@ public class Puzzler {
     * Explain how the return values from #3 and #4 differ.
 
 ```text
-PUT ANSWER TO #5 HERE
+The return values from #3 and #4 differ because Part #3 is creating a new point from the dimensions given
+ by Rectangle rect and the return object is a Point. Part  #4 is trying to determine the distance between
+ two points, center and blank, and the return value is a double. 
 ```
 
 ```java
@@ -87,14 +90,18 @@ Recall that aliases are two variables that refer to the same object.
     * Put the output in the text block below
 
 ```text
-PUT ANSWER TO #2 HERE
+The output is:
+
+(5, 8)
+(5, 8)
 ```
 
 3. At the end of main, are p1 and p2 aliased? Why or why not?
     * Put your answer in the text block below
 
 ```text
-PUT ANSWER TO #3 HERE
+p1 and p2 are not aliased because they refer to two different objects. Even though box1 grew by one, p1 and p2 were
+assigned different points. 
 ```
 
 ```java
@@ -142,6 +149,7 @@ for (int i = 0; i < s.length(); i++) {
     * Screenshot your output and add it to your project as Part3_2.jpg
 3. Generalize the code so that it works on any string.
     * What could you do to generalize it more?
+      * I added an if statement that would break the loop and return the count as zero if the String was empty.
 
 ## Part 4: Large Numbers
 

src/BigIntRewrite.java

@@ -1,5 +1,22 @@
+import java.math.BigInteger;
 public class BigIntRewrite {
+
+    public static BigInteger pow(int x, int n) {
+        BigInteger newX= BigInteger.valueOf(x);
+        if (n == 0) return BigInteger.valueOf(1);
+        // find x to the n/2 recursively
+        BigInteger t = pow(x, n / 2);
+        // if n is even, the result is t squared
+        // if n is odd, the result is t squared times x
+        if (n % 2 == 0) {
+            return t.multiply(t);
+        } else {
+            BigInteger theBigInteger=t.multiply(t);
+            return  theBigInteger.multiply(newX);
+        }
+    }
     public static void main(String[] args) {
+        System.out.println(pow(20,20));
 
     }
 }

src/StringPlayground.java

@@ -1,4 +1,22 @@
 public class StringPlayground {
-    public static void main(String[] args) {
+    public static int parantheses(String s) {
+
+        int count = 0;
+        for (int i = 0; i < s.length(); i++) {
+            if (s.length()==0){break;}
+            char c = s.charAt(i);
+            if (c == '(') {
+                count++;
+            } else if (c == ')') {
+                count--;
+            }
+        }
+        return count;
     }
-}
+    public static void main(String[] args) {
+        String string = "(3^2)+(15+2)=3";
+        String  not ="(This sentence is not punctuated correctly.)  )";
+        System.out.println(parantheses(string));
+        System.out.println(parantheses(not));
+        }
+    }