[백준] 14681번 : 사분면 고르기 - Dart(다트)

https://www.acmicpc.net/problem/14681

import 'dart:io';
void main(){
    int? x=int.parse(stdin.readLineSync()!);
    int? y=int.parse(stdin.readLineSync()!);
    if(x>0&&y>0) print(1);
    else if(x<0&&y>0) print(2);
    else if(x<0&&y<0) print(3);
    else if(x>0&&y<0) print(4);
}