题解 | 求绝对值，平方根，对数，正弦值

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        double num = scanner.nextDouble();

        //write your code here......
        System.out.println(num < 0 ? num * -1.0 : num * 1.0);
        System.out.println(Math.sqrt(num));
        System.out.println(Math.log(num));
        System.out.println(Math.sin(num));
    }
}