commit of Feature01 (fixed)

README.md

@@ -16,7 +16,7 @@
     * Is the **blank** object mutable or immutable? How can you tell?
 
 ```text
-PUT ANSWER TO #2 HERE
+It is mutable as it is a point, and points are mutable.
 ```
 
 ```java
@@ -47,7 +47,7 @@ public class Puzzler {
     * Explain how the return values from #3 and #4 differ.
 
 ```text
-PUT ANSWER TO #5 HERE
+Number 3 returns a primitive, number 4 returns an object. 
 ```
 
 ```java
@@ -87,14 +87,15 @@ 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
+(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 aliased as they both refer to box1.
 ```
 
 ```java

src/BigIntRewrite.java

@@ -1,5 +1,22 @@
+import java.math.BigInteger;
+
+
 public class BigIntRewrite {
     public static void main(String[] args) {
+        BigInteger pow = pow(6, 4);
+        System.out.println(pow);
 
     }
+    public static BigInteger pow(int x, int n) {
+        if (n == 0) return BigInteger.ONE; // BigInteger constant for 1 (had to look this up)
+        // 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 {
+            return t.multiply(t).multiply(BigInteger.valueOf(x));
+        }
+    }
 }

src/StringPlayground.java

@@ -1,4 +1,28 @@
+import java.util.Scanner;
+
 public class StringPlayground {
     public static void main(String[] args) {
+        String s;
+        Scanner in = new Scanner(System.in);
+        System.out.println("Input what you wish to check.");
+        s = in.nextLine();
+        int count = findChar(s);
+        System.out.println(count);
     }
+
+
+
+    public static int findChar(String s){
+        int count = 0;
+        for (int i = 0; i < s.length(); i++) {
+            char c = s.charAt(i);
+            if (c == '(') {
+                count++;
+            }
+            else if (c == ')') {count--;}
+        }
+
+        return count;
+    }
+    in.close();
 }