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Overview

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

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Arithmetic Operators Table

OperatorDescriptionExampleResult
+Addition10 + 313
-Subtraction10 - 37
*Multiplication10 * 330
/Division (returns double)10 / 33.333...
~/Integer Division10 ~/ 33
%Modulo (remainder)10 % 31
The ~/ operator performs integer division and returns only the whole number part, discarding any remainder.

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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
}

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Key Differences

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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.

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Practical Uses

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Calculating Remainder

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

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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

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