Calculator

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Calculator {

    public static void main(String[] args) throws NumberFormatException, IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int iFirstOperend = 0, iSecondOperend = 0, iRetValue = 0;
        char cOperator = 0;

        System.out.println("첫 번째 수를 입력하세요.");
        iFirstOperend = Integer.parseInt(in.readLine());

        System.out.println("연산자를 입력하세요.[+, -, *, /]");
        cOperator = (char)System.in.read();
        System.in.read();

        System.out.println("두 번째 수를 입력하세요.");
        iSecondOperend = Integer.parseInt(in.readLine());

        switch(cOperator) {
        case '+':
            iRetValue = iFirstOperend + iSecondOperend;
            break;
        case '-':
            iRetValue = iFirstOperend - iSecondOperend;
            break;
        case '*':
            iRetValue = iFirstOperend * iSecondOperend;
            break;
        case '/':
            iRetValue = iFirstOperend / iSecondOperend;
            break;
        default:
            System.out.println("연산이 되지 않습니다.");
            System.exit(0);
        }

        System.out.printf("결과 값은 %d 입니다.", iRetValue);
        System.exit(0);
    }

}