/******************************************************************************

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*******************************************************************************/


/**
User inputs choice:
Add : add
Subtract : sub
Multiply : mul
Divide : div
User inputs numbers:
Print result
**/


import java.util.*;


public class Main
{
    static Scanner sc = new Scanner(System.in);
    
	public static void main(String[] args) {
	    
	    
	    String userInput = get_input();
	    
        System.out.println("Value recieved:"+userInput);
        
        System.out.println("Eneter 2 numbers");
        

        double num1 = get_number();
        double num2 = get_number();
        
        double result = 0;
        
        if (userInput.equals("add")){
            result = num1+num2;
        }
        else if (userInput.equals("sub")){
            result = num1-num2;
        }
        else if (userInput.equals("mul")){
            result = num1*num2;
        }
        else if (userInput.equals("div")){
            result = num1/num2;
        }
        
        System.out.println("The result is:");
        System.out.println(result);
       
	}
	
	static String get_input(){
	    
	    
	    String userChoice;
	    System.out.println("Please enter your choice: add,sub,mul or div");
	    userChoice = sc.nextLine();
	    
	    while (!(userChoice.equals("add") || userChoice.equals("sub") || userChoice.equals("mul") || userChoice.equals("div") ) ) {

	        System.out.println("Invalid Input.Please try again");
	        userChoice = sc.nextLine();
	    } 
	    return userChoice;
	}
	
	static double get_number(){
	    
	    double num;
        num = sc.nextDouble();
        
        return num    
	}
	
	
}