Merge pull request #174 from vish-han/patch-4

Armstrong number added

Author: SarthakKeshari

Number Theory/ArmstrongNumber.java

@@ -0,0 +1,34 @@
+//Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers;
+/* 153 = (1*1*1)+(5*5*5)+(3*3*3)  
+where:  
+(1*1*1)=1  
+(5*5*5)=125  
+(3*3*3)=27  
+So:  
+1+125+27=153  */
+
+public class ArmstrongNumber {
+    public ArmstrongNumber() {
+    }
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int num = in.nextInt();
+        int temp = num;
+
+        int result;
+        //we will break the number into individual digits and cube it and then 
+        //sum the cubes of individual digits 
+        for(result = 0; 0 < num; num /= 10) {
+            int rem = num % 10;
+            result += rem * rem * rem;
+        }
+ // we check if the number is armstrong or not
+        if (temp == result) {
+            System.out.println(temp + " is a armstrong number");
+        } else {
+            System.out.println(temp + " is not a armstrong number");
+        }
+
+    }
+}