JavaScript tiene los siguientes tipos de variables:
- Number: para números, tanto enteros como decimales.
- String: para cadenas de caracteres.
- Boolean: para valores verdaderos o falsos.
- Array: para almacenar una colección de valores.
- Object: para almacenar un conjunto de pares propiedad-valor.
- Symbol: para crear valores únicos.
- null: para indicar que una variable no tiene un valor asignado.
- undefined: para indicar que una variable no ha sido definida.
Ejemplo:
var number = 25;
var name = "Audra";
var isStudent = true;
var grades = [90, 80, 75];
var person = {firstName: "Audra", lastName: "tu guia"};
var uniqueId = Symbol("id");
var emptyValue = null;
var notDefined;
Java tiene los siguientes tipos de variables:
- int: para números enteros.
- double: para números con decimales.
- float: para números con decimales.
- char: para caracteres.
- String: para cadenas de caracteres.
- boolean: para valores verdaderos o falsos.
- byte: para números enteros de 8 bits.
- short: para números enteros de 16 bits.
- long: para números enteros de 64 bits.
Ejemplo:
int number = 25;
double decimalNumber = 3.14;
float anotherDecimalNumber = 2.718f;
char letter = 'A';
String name = "Audra";
boolean isStudent = true;
byte smallNumber = 100;
short mediumNumber = 20000;
long largeNumber = 1000000000;
Además, en Java existen los arreglos y los objetos, los cuales pueden almacenar múltiples valores y tienen características específicas.
Ejemplo:
int[] grades = {90, 80, 75};
String[] names = {"Jane", "John", "Doe"};
Person person = new Person("Jane", "Doe");
En C#, los tipos de variables son:
- Enteros: byte, short, int, long
- Punto flotante: float, double
- Booleanos: bool
- Caracteres: char
- Cadenas: string
- Enum: Enumeraciones personalizadas
- Objetos: cualquier tipo de clase o estructura
- Arreglos: Arreglos unidimensionales o multidimensionales de cualquier tipo de dato.
- Nullable: Variables que pueden tener el valor null.
- Dynamic: Variables cuyo tipo es determinado en tiempo de ejecución.
Además de los tipos de variables mencionados anteriormente, en C# también se pueden utilizar tipos de variables genéricos (utilizando el operador < >) y tipos de variables anónimas. También existen las variables de referencia (utilizando el operador «ref») y las variables out (utilizando el operador «out»).
Es importante también mencionar que en C#, las variables deben ser declaradas antes de ser utilizadas y deben ser asignadas un valor inicial antes de ser utilizadas en cualquier operación.
// Declaración de una variable de tipo entero
int numeroEntero = 5;
// Declaración de una variable de tipo decimal
decimal numeroDecimal = 3.14;
// Declaración de una variable de tipo cadena
string cadenaTexto = "Hola mundo";
// Declaración de una variable de tipo booleano
bool verdaderoOFalso = true;
// Declaración de una variable genérica
List<int> listaEnteros = new List<int>();
// Declaración de una variable anónima
var miVariableAnonima = new { Nombre = "Juan", Edad = 30 };
// Declaración de una variable de referencia
int numero = 10;
int otroNumero = 20;
ref int numeroReferencia = ref numero;
numeroReferencia = otroNumero;
// Declaración de una variable out
int numeroSalida;
ObtenerNumero(out numeroSalida);
En C++, los tipos de variables incluyen:
- Enteros:
int,short,long,long long - Punto flotante:
float,double - Caracteres:
char - Booleanos:
bool - Cadenas de caracteres:
string
Ejemplo:
int edad = 25;
float altura = 1.75;
char inicial = 'J';
bool esMayor = true;
string nombre = "Lucas";
Es importante tener en cuenta que C++ también tiene el concepto de tipos de datos personalizados (structs y clases) y punteros.
En Python, los tipos de variables incluyen:
- Enteros:
int - Punto flotante:
float - Cadenas de caracteres:
str - Booleanos:
bool - Listas:
list - Tuplas:
tuple - Diccionarios:
dict - Conjuntos:
set
Ejemplo:
edad = 25
altura = 1.75
inicial = 'J'
esMayor = True
nombre = "Audra"
En python no existe un tipo de dato «char» ya que las cadenas de caracteres son muy flexibles y se pueden usar para contener un solo caracter.
En PHP, los tipos de variables son:
- Integer (número entero)
- Float (número con decimales)
- String (cadena de caracteres)
- Boolean (verdadero o falso)
- Array (colección de valores)
- Object (objeto)
- Resource (recurso externo, como una conexión a una base de datos)
- NULL (valor nulo)
Ejemplo:
<?php
$numero = 5; // Integer
$decimal = 2.5; // Float
$nombre = "Juan"; // String
$verdadero = true; // Boolean
$colores = array("rojo", "verde", "azul"); // Array
class Car {
function Car() {
$this->model = "VW";
}
}
$auto = new Car(); // Object
$conexion = mysqli_connect("localhost", "usuario", "contraseña", "nombre_bd"); // Resource
$sinValor = NULL; // NULL
?>
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