APCSA Practice: Can You Crack This Loop Puzzle 🎯

📢 What is the output of the following code?

java
public class Test {
public static void main(String[] args) {
int total = 0;
int n = 1;
while (n less than = 15) {
if (n % 4 == 1 || n % 4 == 3) {
total += n;
}
n++;
}
System.out.println(total);
}
}
```

Options:
A) 56
B) 64
C) 60
D) 68

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📝 Solution Breakdown:
1️⃣ `total` starts at 0, and `n` starts at 1.
2️⃣ The `while` loop runs while `n less than = 15`.
3️⃣ Inside the loop:
➤ If `n % 4 == 1` **OR** `n % 4 == 3`, add `n` to `total`.
4️⃣ Let’s go through valid `n` values:

* ✅ n = 1 → total = 1
* ❌ n = 2
* ✅ n = 3 → total = 4
* ❌ n = 4
* ✅ n = 5 → total = 9
* ❌ n = 6
* ✅ n = 7 → total = 16
* ❌ n = 8
* ✅ n = 9 → total = 25
* ❌ n = 10
* ✅ n = 11 → total = 36
* ❌ n = 12
* ✅ n = 13 → total = 49
* ❌ n = 14
* ✅ n = 15 → total = 64

🔥 Final Answer: Option B — 64

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🔑 Key Takeaway:
This logic checks for specific remainders using the modulus operator to selectively include numbers in the sum.

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Видео APCSA Practice: Can You Crack This Loop Puzzle 🎯 канала Wiingy AP Computer Science