Challenge 1: Integer vs. Floating-Point Division — Possible Solution
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DivisionDemo.java:

public class DivisionDemo {
    public static void main(String[] args) {
        int truncated = 7 / 2;
        double correct = 7 / (double) 2;

        System.out.println("int division (truncated): " + truncated);
        System.out.println("cast to double (correct):  " + correct);
    }
}

Output:

    int division (truncated): 3
    cast to double (correct):  3.5

Explanation:
7 / 2 with both operands as int performs integer division, discarding
the remainder entirely -- the result truncates toward zero to 3, not
the mathematically correct 3.5. Casting one operand to double forces
Java to promote the whole expression to floating-point division before
it happens, producing the correct 3.5.

WHY THIS WORKS AS AN ANSWER
------------------------------
This demonstrates the exact truncation behavior the chapter describes
as identical to C's own int/int division (c1-3), and applies the
chapter's own stated fix -- an explicit cast on one operand -- to
recover the correct floating-point result.