I added armstrong programme on math folder

Math/Armstrong.java

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+import java.util.*;
+public class Armstsrong
+{  
+//function to check if the number is Armstrong or not  
+static boolean isArmstrong(int n)   
+{   
+int temp, digits=0, last=0, sum=0;   
+//assigning n into a temp variable  
+temp=n;   
+//loop execute until the condition becomes false  
+while(temp>0)    
+{   
+temp = temp/10;   
+digits++;   
+}   
+temp = n;   
+while(temp>0)   
+{   
+//determines the last digit from the number      
+last = temp % 10;   
+//calculates the power of a number up to digit times and add the resultant to the sum variable  
+sum +=  (Math.pow(last, digits));   
+//removes the last digit   
+temp = temp/10;   
+}  
+//compares the sum with n  
+if(n==sum)   
+//returns if sum and n are equal  
+return true;      
+//returns false if sum and n are not equal  
+else return false;   
+}   
+//driver code  
+public static void  main(String args[])     
+{     
+int num;   
+Scanner sc= new Scanner(System.in);  
+System.out.print("Enter the number: ");  
+//reads the limit from the user  
+num=sc.nextInt();  
+if(isArmstrong(num))  
+{  
+System.out.print("Armstrong ");  
+}  
+else   
+{  
+System.out.print("Not Armstrong ");  
+}  
+}   
+}  
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