Arithmetic Operators

Overview

Arithmetic operators allow you to perform mathematical calculations in Dart. These operators work with numeric types like int and double.

Arithmetic Operators Table

Operator	Description	Example	Result
`+`	Addition	`10 + 3`	`13`
`-`	Subtraction	`10 - 3`	`7`
`*`	Multiplication	`10 * 3`	`30`
`/`	Division (returns double)	`10 / 3`	`3.333...`
`~/`	Integer Division	`10 ~/ 3`	`3`
`%`	Modulo (remainder)	`10 % 3`	`1`

The ~/ operator performs integer division and returns only the whole number part, discarding any remainder.

Basic Example

Here’s a complete example demonstrating all arithmetic operators:

void main() {
  //Operadores Aritméticos
  int numeroUno = 10;
  int numeroDos = 3;

  print(numeroUno + numeroDos);    // Suma: 13
  print(numeroUno - numeroDos);    // Resta: 7
  print(numeroUno * numeroDos);    // Multiplicación: 30
  print(numeroUno / numeroDos);    // División: 3.333...
  print(numeroUno ~/ numeroDos);   // División entera: 3
  print(numeroUno % numeroDos);    // Módulo: 1
}

Key Differences

Division (`/`) vs Integer Division (`~/`)

The key difference between these two operators:

Division (/): Returns a double with the exact result including decimals
Integer Division (~/): Returns an int with only the whole number part

int a = 10;
int b = 3;

print(a / b);   // Output: 3.3333333333333335 (double)
print(a ~/ b);  // Output: 3 (int)

Use the modulo operator % to get the remainder of a division. This is particularly useful for checking if a number is even or odd: number % 2 == 0 means the number is even.

Practical Uses

Calculating Remainder

int total = 10;
int divisor = 3;
int remainder = total % divisor;  // remainder = 1

Integer Division for Grouping

int students = 25;
int groupSize = 4;
int numberOfGroups = students ~/ groupSize;  // 6 complete groups
int studentsLeft = students % groupSize;     // 1 student left over

Getting Started

Fundamentals

Operators

Control Flow

Functions

Data Structures

Input & Output

Practical Exercises

Overview