Arithmetic operators

Learn arithmetic with +, -, *, /, % and ~/.

Arithmetic operators

Dart has six basic arithmetic operators: + (addition), - (subtraction), * (multiplication), / (division), % (modulo/remainder) and ~/ (integer division).

/ always returns a double: 10 / 3 = 3.333.... If you want an integer result use ~/: 10 ~/ 3 = 3.

% gives the remainder of division: 10 % 3 = 1. It is often used for odd/even checks (x % 2) and in loops.

Using modulo (%)

The % operator gives the remainder of a division. For example 10 % 3 = 1 because 10 divided by 3 fits 3 times (9) and the remainder is 1.

Its most common use is odd/even checks: if x % 2 == 0 then x is even; if x % 2 == 1 it is odd.

It also helps in loops: to do something every third turn write if (i % 3 == 0). This is a handy way for periodic tasks.

Exercise Three operations

Write print(10 + 5), print(10 - 3) and print(4 * 3) inside void main().

Show example solution

void main() {
  print(10 + 5);
  print(10 - 3);
  print(4 * 3);
}

Test yourself

Modulo operator

int kalan = 10 ____ 3;

Show answer

int kalan = 10 % 3;

What is the result of 10 ~/ 3?
- 3.33
- Throws an error
- 3
- 4
Show answer

3 — ~/ does integer division; it drops the fraction.
Match the operators

+

Addition
-

Subtraction
*

Multiplication
/

Division (double)

Next lesson: Assignment operators

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