Calculator.java

import java.util.Scanner;

public class Calculator{
	public static void main(String args[]){
		int ans = 0;
		Scanner in = new Scanner(System.in);
		while(true){
			System.out.println("Enter x to close");
			System.out.print("Enter the operator : ");
			char op = in.next().trim().charAt(0);

			if(op == '+' || op == '-' || op == '*' || op == '/' || op == '%'){
			System.out.println("Enter the numbers");
			int num1 = in.nextInt();
			int num2 = in.nextInt();
			
			if(op == '+'){
				ans = num1+num2;
			}
			if(op == '-'){
				ans = num1-num2;
			}
			if(op == '*'){
				ans = num1*num2;
			}
			if(op == '/'){
				if(num2 != 0){
					ans = num1/num2;
				}
			}
			if(op == '%'){
				ans = num1%num2;
			}
		}else if(op == 'x'||op=='X'){
			break;
		}else{
			System.out.print("Invalid Operation");
		}
			System.out.println(ans);
		}
	}
}