在我使用stdin和随机的飞镖码上的错误

Question

未处理的异常: NoSuchMethodError:类'String‘没有实例方法'<’。接收方："5“尝试调用：<(44) #0 (file:///C:/Users/LOGO%20CS/IdeaProjects/oop%205/bin/oop_5.dart:20:18) ( Object.noSuchMethod :核心补丁/object_patch.dart:38:5) #1 guessWithPC.run #2主Object.noSuchMethod #3 _delayEntrypointInvocation。(dart:isolate-patch/isolate_patch.dart:297:19) #4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

使用退出代码255完成的处理

import 'dart:io';
import 'dart:math';
class guessWithPC{
  var userGuess;
  var computerGuess;
  var number;
  guessWithPC(){
    Random random;
    random =Random();
    number = random.nextInt(50);
    print('guess the number');

  }
run(){
    Random random;
    random =Random();
  userGuess = stdin.readLineSync();
  int.parse(userGuess);
  computerGuess = random.nextInt(50);
    if(userGuess < number ) {
      print('less then true');
    }
      print(computerGuess);
      if(computerGuess < number ){
        print(' computer guessed less then true');
      }
    if(userGuess > number){
      print('higher then true');
      print(computerGuess);}
      if(computerGuess > number ) {
        print(' computer guessed higher then true');
      }
        if(userGuess == number){
        print('you won');
        }
      if(computerGuess == number){
        print('computer won');
          }
  }
}
main(){
  guessWithPC guess = guessWithPC();
  guess.run();
}

Answer 1

您需要在变量int.parse中保存userGuess的值。

 userGuess = stdin.readLineSync();
 userGuess=int.parse(userGuess);