Arithmetic Operators

Arithmetic operators in Dart perform common mathematical operations on numeric types (int and double).

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List of Arithmetic Operators

Dart supports the following standard mathematical operators:

Operator	Name	Description	Example
+	Addition	Adds two values	5 + 2 // 7
-	Subtraction	Subtracts the second value from the first	5 - 2 // 3
*	Multiplication	Multiplies two values	5 * 2 // 10
/	Division	Divides two values and returns a double	5 / 2 // 2.5
~/	Integer Division	Divides two values and returns the integer portion	5 ~/ 2 // 2
%	Modulus	Returns the division remainder	5 % 2 // 1
-expr	Negation	Inverts the sign of the value	-5

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Key Code Examples

Standard Operations

dart
void main() {
  int a = 10;
  int b = 3;

  print(a + b);  // 13
  print(a - b);  // 7
  print(a * b);  // 30
  print(a / b);  // 3.3333333333333335 (Returns double)
  print(a ~/ b); // 3 (Truncated integer division)
  print(a % b);  // 1 (Remainder)
}

Prefix vs Postfix Increment/Decrement

Dart has ++ (increment by 1) and -- (decrement by 1) operators. These behave differently depending on where they are placed:

• Postfix (x++, x--): The current value is used first, and then the variable is modified.
• Prefix (++x, --x): The variable is modified first, and then the new value is used.

dart
void main() {
  int x = 5;

  print(x++); // Prints 5, x becomes 6
  print(++x); // x becomes 7, prints 7

  int y = 5;
  print(y--); // Prints 5, y becomes 4
  print(--y); // y becomes 3, prints 3
}

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Summary

• division using / always returns a double.
• Integer division using ~/ throws away the decimal part and returns an int.
• Postfix operators apply changes after the expression evaluates; prefix operators apply them before.