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test: adding subject and main
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public class ExerciseRunner {
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public static void main(String[] args) {
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ArmstrongNumber armstrongNumber = new ArmstrongNumber();
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// Test case 1
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int number1 = 153;
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System.out.println("Is " + number1 + " an Armstrong number? " + armstrongNumber.isArmstrong(number1)); // Expected output: true
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// Test case 2
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int number2 = 123;
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System.out.println("Is " + number2 + " an Armstrong number? " + armstrongNumber.isArmstrong(number2)); // Expected output: false
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// Test case 3
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int number3 = 9474;
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System.out.println("Is " + number3 + " an Armstrong number? " + armstrongNumber.isArmstrong(number3)); // Expected output: true
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}
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}
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## Armstrong Number
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### Instructions
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Write a program to check if a given number is an Armstrong number. An Armstrong number of n digits is an integer such that the sum of its digits raised to the power n is equal to the number itself.
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Example: 153 is an Armstrong number bacause `1^3 + 5^3 + 3^3 = 153`
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### Expected Class
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```java
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public class ArmstrongNumber {
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public boolean isArmstrong(int number) {
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// Implementation to check if the given number is an Armstrong number
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}
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}
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```
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### Usage
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Here is a possible `ExerciseRunner.java` to test your class:
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```java
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public class ExerciseRunner {
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public static void main(String[] args) {
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ArmstrongNumber armstrongNumber = new ArmstrongNumber();
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// Test case 1
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int number1 = 153;
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System.out.println("Is " + number1 + " an Armstrong number? " + armstrongNumber.isArmstrong(number1)); // Expected output: true
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// Test case 2
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int number2 = 123;
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System.out.println("Is " + number2 + " an Armstrong number? " + armstrongNumber.isArmstrong(number2)); // Expected output: false
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// Test case 3
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int number3 = 9474;
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System.out.println("Is " + number3 + " an Armstrong number? " + armstrongNumber.isArmstrong(number3)); // Expected output: true
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}
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}
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```
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### Expected Output
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```shell
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$ javac *.java -d build
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$ java -cp build ExerciseRunner
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Is 153 an Armstrong number? true
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Is 123 an Armstrong number? false
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Is 9474 an Armstrong number? true
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$
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```
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