练习三

3.已知函数,输入x的值,输出对应的y的值. x + 3 ( x > 0 ) y = 0 ( x = 0 ) x2 –1 ( x < 0 )
package apple;
import java.util.*;
public class Main {
            
            
                public static void main(String[] args)
                {
                    Scanner input=new Scanner(System.in);
                    int x=input.nextInt();
                    int y;
                    if(x>0)
                    {
                        y=x+3;
                    }
                    else {
                    if (x<0) 
                    {
                        y=(2*x)-1;
                    }
                    else 
                        y=0;
                    }
                    System.out.println(y);
                    
                }
}