Explain and demonstrate Java's increment and decrement operators (++, --) with examples.

`java public class IncrementDecrement public static void main(String[] args) int x = 10; int y = 5; System.out.println("Initial value of x: " + x); // x is 10 System.out.println("Initial value of y: " + y); // y is 5 // Increment operators // Post-increment (x++) - uses current value, then increments int a = x++; System.out.println("After a = x++: a = " + a + ", x = " + x); // a is 10, x is 11 // Pre-increment (++y) - increments value, then uses new value int b = ++y; System.out.println("After b = ++y: b = " + b + ", y = " + y); // b is 6, y is 6 System.out.println("--- Decrement Operators ---"); int p = 20; int q = 15; System.out.println("Initial value of p: " + p); // p is 20 System.out.println("Initial value of q: " + q); // q is 15 // Decrement operators // Post-decrement (p--) - uses current value, then decrements int c = p--; System.out.println("After c = p--: c = " + c + ", p = " + p); // c is 20, p is 19 // Pre-decrement (--q) - decrements value, then uses new value int d = --q; System.out.println("After d = --q: d = " + d + ", q = " + q); // d is 14, q is 14 ` Question 5 a) create a simple grade calculator using java switch statement (0-39= F, 40-44=E, 45-49=D, 50-59=C, 60-69=B, 70-100=A) To use a switch statement for ranges, we can divide the score by 10 to get a 'tens' digit, which can then be used in the switch statement. `java import java.util.Scanner; public class GradeCalculatorSwitch public static void main(String[] args) Scanner input = new Scanner(System.in); System.out.print("Enter student's score (0-100): "); int score = input.nextInt(); String grade; if (score < 0 || score > 100) grade = "Invalid Score"; else // Divide score by 10 to get a range indicator // e.g., 70-100 -> 7, 8, 9, 10 // 60-69 -> 6 // 50-59 -> 5 // 45-49 -> 4 (but needs special handling for 40-44) // 0-39 -> 0, 1, 2, 3 int scoreRange = score / 10; switch (scoreRange) case 10: // Score 100 case 9: // Scores 90-99 case 8: // Scores 80-89 case 7: // Scores 70-79 grade = "A"; break; case 6: // Scores 60-69 grade = "B"; break; case 5: // Scores 50-59 grade = "C"; break; case 4: // Scores 40-49 if (score >= 45) // D for 45-49 grade = "D"; else // E for 40-44 grade = "E"; break; case 3: // Scores 30-39 case 2: // Scores 20-29 case 1: // Scores 10-19 case 0: // Scores 0-9 grade = "F"; break; default: grade = "Invalid Score"; // Should be caught by initial if, but good for robustness break; System.out.println("The grade for score " + score + " is: " + grade); input.close(); ` b) How does the switch statement improve code readability over multiple if-else blocks? The switch statement can improve code readability over multiple if-else blocks primarily when checking a single variable against multiple discrete, constant values. 1. Clarity for Specific Values: It clearly lists each possible value (or range, with a bit of manipulation like in the example above) and its corresponding action, making it easier to see all possible paths at a glance. 2. Reduced Nesting: For many conditions, if-else if-else chains can become long and visually complex. switch statements often present a flatter structure, reducing the need for deep nesting. 3. Intent: A switch statement explicitly signals that you are choosing one path out of many based on the value of a single expression, which can be more intuitive than a series of if checks. 3 done, 2 left today. You're making progress.