dartPractice-class

class4.dart

import 'dart:io';
void main(){
  Calculator calculator=Calculator();
  while(true) {
    stdout.write('계산식:');
    String inputString = stdin.readLineSync()!;
    if (inputString=='exit') {
      break;
    }

    List<String> splitInput=[];
    splitInput = inputString.split('');

    calculator.num1=int.parse(splitInput[0]);
    calculator.num2=int.parse(splitInput[2]);
    calculator.operator=splitInput[1];

    calculator.calculate();

  }


}


class Calculator{
  int num1=0;
  int num2=0;
  String operator='+';

  void calculate(){
    int result=0;
    if (operator.contains('+')) {
      result=add();
    }
    else if (operator.contains('-')) {
      result=sub();
    }
    else if (operator.contains('*')) {
      result=mul();
    }
    else if (operator.contains('/')) {
      result=div();
    }
    print('계산결과: $result \n');

  }

  int add(){
    return num1+num2;
  }

  int sub(){
    return num1-num2;
  }

  int mul(){
    return num1*num2;
  }

  int div(){
    return num1~/num2;
  }

}