编写题解 2790: 分段函数

解题思路:

注意事项:

参考代码:

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

            double a = sc.nextDouble();

              if(a>=0&&a<5){

                    System.out.printf("%.3f",-a+2.5);

              }

              if(a>=5&&a<10){

                    System.out.printf("%.3f",2.0-1.5*(a-3)*(a-3));

              }

              if(a>=10&&a<20){

                    System.out.printf("%.3f",a/2.0-1.5);

              }

    }

}