Added code for pronic number. Closes #83

PronicNumber.java

@@ -0,0 +1,22 @@
+import java.util.Scanner;
+public class PronicNumber{
+    public static boolean isPronic(int n){
+        for(int i = 0; i < Math.sqrt(n); i++){
+            if(n == i * (i+1)) return true;
+        }
+        return false;
+    }
+    public static void main(String args[]){
+        Scanner sc = new Scanner(System.in);
+        int n;
+        System.out.println("Enter a number : ");
+        n = sc.nextInt();
+        if(isPronic(n)){
+            System.out.println(n + " is a pronic number.");
+        }
+        else{
+            System.out.println(n + " is not a pronic number");
+        }
+        sc.close();
+    }
+}

sorting/CycleSort.java

@@ -0,0 +1,87 @@
+import java.util.Scanner;
+class CycleSort   
+{  
+/*function to implement to cycle sort*/  
+static void cycleSort(int a[], int n)    
+{    
+    int start, element, pos, temp, i;    
+
+   /*Loop to traverse the array elements and place them on the correct  
+ 
+position*/  
+    for (start = 0; start <= n - 2; start++) {    
+        element = a[start];  
+
+        /*position to place the element*/  
+        pos = start;    
+
+        for (i = start + 1; i < n; i++)    
+            if (a[i] < element)    
+                pos++;    
+        if (pos == start)  /*if the element is at exact position*/  
+            continue;    
+        while (element == a[pos])    
+            pos += 1;    
+        if (pos != start) /*put element at its exact position*/   
+        {    
+            //swap(element, a[pos]);    
+            temp = element;    
+            element = a[pos];    
+            a[pos] = temp;      
+        }    
+        /*Rotate rest of the elements*/  
+        while (pos != start)   
+        {    
+            pos = start;    
+            /*find position to put the element*/  
+            for (i = start + 1; i < n; i++)    
+                if (a[i] < element)    
+                    pos += 1;    
+
+            /*Ignore duplicate elements*/  
+            while (element == a[pos])    
+                pos += 1;    
+
+            /*put element to its correct position*/  
+            if (element != a[pos])   
+            {    
+                temp = element;    
+                element = a[pos];    
+                a[pos] = temp;      
+            }    
+        }    
+    }    
+
+ }    
+
+  static void print(int a[], int n) /*function to print array elements*/  
+    {  
+    int i;  
+    for(i = 0; i < n; i++)    
+    {    
+        System.out.print(a[i] + " ");    
+    }        
+    }  
+
+
+public static void main(String args[])   
+   {  
+    // int[] a = {87, 42, 27, 17, 7, 37, 57, 47, 2, 1};    
+    // int n = a.length;    
+    Scanner sc = new Scanner(System.in);
+    System.out.println("Enter the length of the array : ");
+    int n = sc.nextInt();
+    System.out.println("Enter the elements of the array :  ");
+    for(int i = 0; i < n; i++)
+    {
+        arr[i] = sc.nextInt();
+    }
+    sc.close();
+    System.out.print("Before sorting array elements are - \n");  
+    print(a, n);  
+    cycleSort(a, n);    
+    System.out.print("\nAfter applying cycle sort, array elements are - \n");    
+    print(a, n);  
+}  
+
+}