如何正确的使用 Dart SDK API

dart-core

dart:core library

https://api.dart.dev/stable/2.9.1/dart-core/dart-core-library.html

num methods

/**

 *

 * @author xgqfrms

 * @license MIT

 * @copyright xgqfrms

 * @created 2019-01-01

 *

 * @description dart-core api num methods

 * @augments

 * @example

 *

 */

void main() {

  double a = 3;

  double b = 7;

  // int a = 3;

  // int b = 7;

  var add = a + b;

  print("add = ${add}");

  var minus = a - b;

  print("minus = ${minus}");

  var multiply = a * b;

  print("multiply = ${multiply}");

  var division = a / b;

  print("division = ${division}");

  var remainder = a % b;

  print("remainder = ${remainder}");

  var rounding = a ~/ b;

  print("rounding = ${rounding}");

  dynamic even = 2;

  dynamic odd = 3;

  print("\neven = ${even.isEven}");

  print("odd = ${odd.isOdd}");

  // double: static const double nan = 0.0 / 0.0;

  // dynamic nan = 0 / 0;

  dynamic nan = 0.0 / 0.0;

  print("nan = ${nan.isNaN}");

  double neg = -12;

  print("\nneg = ${neg.abs()}");

  double float = 12.5;

  print("float = ${float.round()}");

  print("float = ${float.floor()}");

  print("float = ${float.ceil()}");

  double f = 3.1415926;

  print("f = ${f.toInt()}");

  int i = 8;

  print("float = ${i.toDouble()}");

}