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floating point literal

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C++
 
Lenguaje C++
Los temas generales
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General topics
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Control de flujo
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Flow control
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Sentencias condicionales ejecución
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Conditional execution statements
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Instrucciones de iteración
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Iteration statements
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Ir declaraciones
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Jump statements
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Funciones
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Functions
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declaración de la función
lambda declaración de la función
función de plantilla
especificador inline
especificaciones de excepción (obsoleto)
noexcept especificador (C++11)
Excepciones
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Exceptions
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Los espacios de nombres
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Namespaces
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Tipos
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Types
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decltype specifier (C++11)
Los especificadores
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Specifiers
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cv especificadores
almacenamiento duración especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialización
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Initialization
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Los literales
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Literals
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Expresiones
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Expressions
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representaciones alternativas
Utilidades
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Utilities
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Tipos
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Types
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typedef declaration
alias de tipo de declaración (C++11)
atributos (C++11)
Lanza
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Casts
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conversiones implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-cast estilo y funcional
De asignación de memoria
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Memory allocation
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Clases
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Classes
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Clase propiedades específicas de la función
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Class-specific function properties
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Funciones especiales miembro
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Special member functions
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Plantillas
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Templates
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clase de plantilla
función de plantilla
plantilla de especialización
paquetes de parámetros (C++11)
Varios
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Miscellaneous
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Montaje en línea
 
Punto flotante literal define una constante en tiempo de compilación, cuyo valor se especifica en el archivo de origen .
Original:
Floating point literal defines a compile-time constant whose value is specified in the source file.
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[editar] Sintaxis

A literales de punto flotante tiene dos sintaxis. La primera consiste en las siguientes partes:
Original:
A floating-point literals have two syntaxes. The first one consists of the following parts:
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  • no vacío secuencia de dígitos decimales que contienen un carácter de punto decimal (define significativa)
    Original:
    nonempty sequence of decimal digits containing a decimal point character (defines significant)
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  • (opcional) e o E seguido con menos opcionales o signo más y la secuencia no vacía de dígitos decimales (define exponente)
    Original:
    (opcional) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • (opcional) un especificador de tipo sufijo como l, f, L o F
    Original:
    (opcional) a suffix type specifier as a l, f, L or F
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El segundo consiste de las siguientes partes:
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The second one consists of the following parts:
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  • no vacío secuencia de dígitos decimales (define significativa)
    Original:
    nonempty sequence of decimal digits (defines significant)
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  • e o E seguido con menos opcionales o signo más y la secuencia no vacía de dígitos decimales (define exponente)
    Original:
    e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • (opcional) un especificador de tipo sufijo como l, f, L o F
    Original:
    (opcional) a suffix type specifier as a l, f, L or F
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El tipo define el sufijo especificador de tipo real del literal de punto flotante:
Original:
The suffix type specifier defines the actual type of the floating-point literal:
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  • (Sin sufijo) define double
    Original:
    (no suffix) defines double
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  • f F define float
    Original:
    f F defines float
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  • l L define long double
    Original:
    l L defines long double
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[editar] Explicación

Una notación científica decimal se utiliza, lo que significa que el exponente es la potencia de 10 por el que es importante multiplied.
Original:
A decimal scientific notation is used, meaning that the exponent is the power of 10 by which the significant is multiplied.
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El significado matemático de 123e4 es 123 × 10 4 </ sup>
Original:
The mathematical meaning of 123e4 is 123×104
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</div>

[editar] Ejemplo

std::cout << 123.456e-67 << '\n'
          << .1E4f       << '\n'
          << 58.         << '\n'
          << 4e2         << '\n';

Output: 

1.23456e-65
1000
58
400
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/language/floating_literal&oldid=23307»