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();
+    }
+}