[Dart] 1일차_operator

1) 연산

void main() {
  int number = 2;
  
  print(number);
  print(number + 2);
  print(number - 2);
  
  
  print('-----------------');
  print(number % 2);
  
  print('-----------------');
  number ++;
  
  print(number);
  
  number --;
  
  print(number);
}

void main() {
  double number = 4.0;
  
  print(number);
  
  number +=1;
  
  print(number);
  
  number -= 1;
  
  print(number);
  
  number*= 2;
  
  print(number);
  
  number /= 2;
  
  print(number);
}

 

2) null 조건 

void main() {
  // null
  double? number = 4.0;
  
  print(number);
  
  number = 2.0;
  
  print(number);
  
  number = null;
  
  print(number);
  
  number ??= 3.0;  // number가 null이면 오른쪽 값으로 바꿔라
  
  print(number);
}

3) 값 비교

void main() {
  int number1 = 1;
  int number2 = 2;
  
  print(number1 > number2);
  print(number1 < number2);
  print(number1 >= number2);
  print(number1 <= number2);
  print(number1 == number2);
  print(number1 != number2);
}

4) 형식 비교

void main() {
  int number1 = 1;
  
  print(number1 is int);
  print(number1 is String);
  
  print(number1 is! int);
  print(number1 is! String);
}

5) 논리 비교

void main() {
  // && - and 조건
  // || - or 조건
  bool result = 12 > 10 && 1 > 0;
  
  print(result);
  
  bool result2 = 12 > 10 && 0 > 1;
  
  print(result2);
  
  bool result3 = 12 > 10 || 1 > 0;
  
  print(result3);
  
  bool result4 = 12 < 10 || 0 > 1;
  
  print(result4);
  
  bool result5 = 12 < 10 || 0 > 1;
  
  print(result5);
}