lab1_Calculator

import java.io.*; 
import java.util.*; 
import java.text.*; 
import java.math.*; 
import java.util.regex.*; 
 
interface ICalculator { 
    int add(int x, int y); 
    float divide(int x, int y) throws RuntimeException; 
} 
 
 
public class Calculator implements ICalculator{ 
      public int add(int x, int y){ 
       return x + y; 
   } 
      public float divide(int x, int y) throws RuntimeException{ 
           return (float) x/y;  
       } 
    
   public static void main(String[] args){ 
       int num_1, num_2; 
       char operator; 
        
       Scanner sc = new Scanner(System.in); 
       num_1 = sc.nextInt(); 
       operator = sc.next().charAt(0); 
       num_2 = sc.nextInt(); 
        
     if(num_2 != 0) { 
       if(operator == '+'){ 
           Calculator addition = new Calculator(); 
           System.out.println(addition.add(num_1,num_2)); 
       }else if(operator == '/'){ 
           try{ 
                Calculator division = new Calculator(); 
                System.out.println(division.divide(num_1,num_2)); 
           }catch(Exception e){ 
               System.out.println("Error"); 
           } 
       } 
       else{ 
           System.out.println("Error"); 
       } 
      }else { 
          System.out.println("Error"); 
   } 
 } 
}