while문 계산기

 
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num;
 
        float f;
 
        char calculation_opt;
        String choice = null;
        do {
 
            System.out.print("정수를 입력 : ");
 
            num = sc.nextInt();
 
            System.out.print("실수를 입력 : ");
 
            f = sc.nextFloat();
 
            System.out.print("+,-,*,/ => 연산을 입력 :  ");
 
            calculation_opt = sc.next().charAt(0);
 
            switch (calculation_opt) {
 
            case '+':
 
                System.out.println(num + f);
 
                break;
 
            case '-':
 
                System.out.println(num - f);
 
                break;
 
            case '*':
 
                System.out.println(num * f);
 
                break;
 
            case '/':
 
                System.out.println(num / f);
 
                break;
 
            default:
 
                System.out.println("연산을 잘못입력하셨습니다");
 
                break;
 
            }
            System.out.print("추가로 계산하시겠습니까? y or n : ");
            choice = sc.next();
            while (!(choice.equals("y") || choice.equals("Y") || choice.equals("n") || choice.equals("N"))) {
                System.out.print("다시 입력하시오 : ");
                choice = sc.next();
            }
        } while (choice.equals("y") || choice.equals("Y"));
 
    }