課後練習

package shi;
import java.util.Random;
public class shi {
public static void main(String[] args) {
Random random = new Random();
int num1, num2, result = 0;
int operation;

        for (int i = 0; i < 30; i++) {
            // Generate random numbers between 1 and 100
            num1 = random.nextInt(100) + 1;
            num2 = random.nextInt(100) + 1;

            // Generate random operation
            operation = random.nextInt(4);

            switch (operation) {
                case 0:
                    // Addition
                    result = num1 + num2;
                    System.out.printf("%d + %d = ", num1, num2);
                    break;
                case 1:
                    // Subtraction
                    if (num1 >= num2) {
                        result = num1 - num2;
                        System.out.printf("%d - %d = ", num1, num2);
                    } else {
                        // Swap num1 and num2 to ensure non-negative result
                        result = num2 - num1;
                        System.out.printf("%d - %d = ", num2, num1);
                    }
                    break;
                case 2:
                    // Multiplication
                    result = num1 * num2;
                    System.out.printf("%d * %d = ", num1, num2);
                    break;
                case 3:
                    // Division
                    if (num2 != 0) {
                        result = num1 / num2;
                        System.out.printf("%d / %d = ", num1, num2);
                    } else {
                        // Avoid division by zero
                        num2 = random.nextInt(100) + 1;
                        result = num1 / num2;
                        System.out.printf("%d / %d = ", num1, num2);
                    }
                    break;
            }
            System.out.println(result);
        }
    }
}