Neon Number Check in Java: Explanation & Practice

Check if sum of digits of square equals the number

Problem summary

A neon number is where the sum of digits of its square equals the number itself. Check if given number is neon.

Starter code

public class Main {
    public static void main(String[] args) {
        int number = 9; // Test case 1
        
        // 9^2 = 81, 8+1 = 9 ✓
        // Print: Is Neon: <true/false>
    }
}

Expected output and test cases

9² = 81, 8+1 = 9
```
Is Neon: true
```
1² = 1
```
Is Neon: true
```
5² = 25, 2+5 = 7 ≠ 5
```
Is Neon: false
```

Hints

Square the number
Calculate sum of digits of square
Compare with original number

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