// Declaring a constant value.
const String s = "constant";

void main() {
  print(s);

  // A const statement can appear anywhere a var statement can.
  const int n = 500000000;

  // Constant expressions perform arithmetic with arbitrary precision.
  const double d = 3e20 / n;
  print(d);

  // A numeric constant has no type until it’s given one, such as by an explicit conversion.
  print(d.toInt());

  // A number can be given a type by using it in a context that requires one, such as a variable assignment or function call.
  // For example, here `sin` from 'dart:math' expects a `double`.
  import 'dart:math';
  print(sin(n));
}