Int and Double Arithmetic - Dart Programming

Dart has int for whole numbers and double for IEEE-754 fractional values. Mixing the two widens the result to a double. / always returns a double; use ~/ for integer division. toInt() truncates a double toward zero, and toDouble() widens an int.

Program

Play the program to widen int + double, convert values in both numeric directions, and watch / produce a double from two int operands.

int_double.dart

void main() {
  int a = 7;
  double b = 2.5;
  var sum = a + b;
  var asInt = b.toInt();
  var asDouble = a.toDouble();
  var quotient = a / 2;
  print('$sum $asInt $asDouble $quotient');
}

widening `int + double` evaluates to a `double`-valued result; the `int` is widened to match.

/ `/` returns a `double` even when both operands are `int`. Use `~/` for an integer quotient.

conversions `double.toInt()` truncates toward zero; `int.toDouble()` widens a whole number to a `double`.