import java.util.Scanner;

public class Arithmetic {


public static void main(String[] args) {

Scanner  scanner =new Scanner(System.in);

System.out.println("식을 입력하세요:");

while(true) {

String op1=scanner.next();

String op2=scanner.next();

String op3=scanner.next();

if(op2=="/"||op2=="%") {

if(op3=="0")

System.out.println("0을 나눌수없습니다. 다시해주세요");

continue;

}

break;

}


switch(op2) {

case "+":

double a=Double.parseDouble(op1);

double b=Double.parseDouble(op3);

System.out.println(a+b);

break;

case "*":

double a1=Double.parseDouble(op1);

double b1=Double.parseDouble(op3);

System.out.println(a1*b1);

break;

case "/":

double a2=Double.parseDouble(op1);

double b2=Double.parseDouble(op3);

break;

case "%":


break;

default: System.out.println("연산 기호가 잘못되었습니다.");

}

scanner.close();


}


}






왜그러여..ㅠ