add assignment 2 q3

src/ca/bcit/comp1510/assignment2/q3/Primes.java

@@ -1,22 +1,119 @@
 package ca.bcit.comp1510.assignment2.q3;
 
+import java.util.List;
+import java.util.ArrayList;
+
+import java.util.Scanner;
+
 /**
  * <p>This is where you put your description about what this class does. You
  * don't have to write an essay but you should describe exactly what it does.
  * Describing it will help you to understand the programming problem better.</p>
  *
- * @author Your Name goes here
+ * @author Braeden Sowinski
- * @version 1.0
+ * @version 1.0.0
  */
 public class Primes {
+
+    /** primes list up to nth number. */
+    private List<Boolean> primes;
+    
+    /**
+     * Primes constructor.
+     * @param n int
+     */
+    public Primes(int n) {
+        primes = new ArrayList<Boolean>(n);
+        calculatePrimes(n);
+    }
+    
+    /** printPrimes. */
+    public void printPrimes() {
+        for (int i = 0; i < primes.size(); i++) {
+            if (primes.get(i)) {
+                System.out.print(i + " ");
+            }
+        }
+    }
+    
+    /** 
+     * countPrimes. 
+     * @return int number of primes
+     * */
+    public int countPrimes() {
+        int count = 0;
+        
+        for (int i = 0; i < primes.size(); i++) {
+            if (primes.get(i)) {
+                count++;
+            }
+        }
+        return count;
+    }
+    
+    /**
+     * isPrime.
+     * @param n int number
+     * @return boolean
+     */
+    public boolean isPrime(int n) {
+        if (n <= 1) {
+            return false;
+        }
+        
+        for (int i = 2; i < n; i++) {
+            if (n % i == 0) {
+                return false;
+            }
+        }
+        
+        return true;
+    }
+    
+    /** 
+     * calculatePrimes. 
+     * @param n int number of primes
+     * */
+    private void calculatePrimes(int n) {
+        for (int i = 0; i < n; i++) {
+            primes.add(isPrime(i));
+        }
+    }
+    
     /**
      * <p>This is the main method (entry point) that gets called by the JVM.</p>
      *
      * @param args command line arguments.
      */
     public static void main(String[] args) {
-        // your code will go here!!!
-        System.out.println("Question three was called and ran sucessfully.");
-    }
         
+        Scanner scan = new Scanner(System.in);
+        
+        int bound = 0;
+        boolean valid = false;
+        
+        do {
+            System.out.print("Enter an upper bound: ");
+            if (!scan.hasNextInt()) {
+                System.out.println(scan.next() + " is not a valid integer.\n");
+                continue;
+            }
+            
+            bound = scan.nextInt();
+            
+            if (bound <= 1) {
+                System.out.println("Bound must be greater than 1.\n");
+                continue;
+            }
+            
+            valid = true;
+
+        } while (!valid);
+
+        scan.close();
+        
+        Primes p = new Primes(bound);
+        
+        p.printPrimes();
+    }
 }