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HTML / CSS / JS

public class ControlFlowDemo {

// Traditional switch with fall-through (avoid unless intentional)
    static String seasonTraditional(int month) {
        String season;
        switch (month) {
            case 12:
            case 1:
            case 2:
                season = "Winter";
                break;
            case 3: case 4: case 5:
                season = "Spring";
                break;
            case 6: case 7: case 8:
                season = "Summer";
                break;
            case 9: case 10: case 11:
                season = "Autumn";
                break;
            default:
                season = "Unknown";
        }
        return season;
    }

// Modern switch expression (Java 14+) — no fall-through, returns value
    static String seasonModern(int month) {
        return switch (month) {
            case 12, 1, 2  -> "Winter";
            case 3,  4, 5  -> "Spring";
            case 6,  7, 8  -> "Summer";
            case 9, 10, 11 -> "Autumn";
            default -> {
                yield "Unknown (month=" + month + ")";  // yield in block arm
            }
        };
    }

public static void main(String[] args) {
        // if / else-if / else
        int score = 82;
        String grade;
        if (score >= 90) {
            grade = "A";
        } else if (score >= 80) {
            grade = "B";
        } else if (score >= 70) {
            grade = "C";
        } else {
            grade = "F";
        }
        System.out.println("Score " + score + " => Grade " + grade);

// Ternary operator (inline if-else for simple assignments)
        String result = (score >= 60) ? "Pass" : "Fail";
        System.out.println("Result: " + result);

// Switch demos
        for (int m = 1; m <= 12; m++) {
            System.out.printf("Month %2d: traditional=%s, modern=%s%n",
                m, seasonTraditional(m), seasonModern(m));
        }
    }
}