[백준]10824번: 네 수

풀이

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

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        String A = st.nextToken();
        String B = st.nextToken();
        String C = st.nextToken();
        String D = st.nextToken();

        String ab = A + B;
        String cd = C + D;

        Long ans = Long.parseLong(ab) + Long.parseLong(cd);
        System.out.println(ans);
    }

}

틀린 코드

int ans = Integer.parseInt(ab) + Integer.parseInt(cd);

1. int형 범위 초과 런타임 에러
2. 입력 조건 확인 !