rlly simple calculator!!

노가다 계산기

import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		boolean wrong = false;
		
		System.out.println("Enter your first number.");
		int a = input.nextInt();
	
		System.out.println("Enter your desired action.");
		System.out.println("a. Addition	" + "b. Subtraction	 " + "c. Multiplication	" + "d. Division");
		String b = input.next();
		if(!b.equals("a") && !b.equals("b") && !b.equals("c") && !b.equals("d"))
		{
			System.out.println("Please write a, b, c, or d.");
			wrong = true;
		}
		while(wrong)
		{	
			System.out.println("Enter your desired action.");
			System.out.println("a. Addition	" + "b. Subtraction	 " + "c. Multiplication	" + "d. Division");
			String x = input.next();
			if(!x.equals("a") && !x.equals("b") && !x.equals("c") && !x.equals("d"))
			{
				System.out.println("Please write a, b, c, or d.");
				wrong = true;
			}
			else
				wrong = false;
		}	
		
		
		System.out.println("Enter your second number.");
		int c = input.nextInt();
		System.out.println("Results are loading...");
		if(b.equals("a"))
		{
			System.out.println("The result is " + (a+c));
		}
		else if(b.equals("b"))
		{
			System.out.println("The result is " + (a-c));
		}
		else if(b.equals("c"))
		{
			System.out.println("The result is " + (a*c));
		}
		else if(b.equals("d"))
		{
			System.out.println("The result is " + (a/c) + " with the remainder of " + (a%c));
		}
	}
}