String type = s.next(); System.out.println("请输入第二个数"); doubleb = s.nextDouble(); s.close(); switch(type){ case"+": System.out.println("结果为:"+add(a,b)); continue; case"-": System.out.println("结果为:"+less(a,b)); continue; case"*": System.out.println("结果...
import java.util.Scanner;public class T {public static void main(String[] args) { Scanner scan = new Scanner(System.in);//String str = "54151+819*5165+15-48/189+5961"; System.out.println("请输入算式,按回车键结束:"); String str = scan.nextLine();System.out....