Espacios de nombres
Variantes
Acciones

std::ratio_subtract

De cppreference.com
< cpp‎ | numeric‎ | ratio

 
 
Numéricos biblioteca
Funciones matemáticas comunes
Floating-point medio ambiente
Los números complejos
Matrices numéricas
Pseudo-aleatoria de generación de números
En tiempo de compilación aritmética racional (C++11)
Genéricos operaciones numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Compilar aritmética tiempo racional
ratio(C++11)
Aritmética
Original:
Arithmetic
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ratio_add(C++11)
ratio_subtract(C++11)
ratio_multiply(C++11)
ratio_divide(C++11)
Comparación
Original:
Comparison
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ratio_equal(C++11)
ratio_not_equal(C++11)
ratio_less(C++11)
ratio_less_equal(C++11)
ratio_greater(C++11)
ratio_greater_equal(C++11)
 
Defined in header <ratio>
template< class R1, class R2 >
using ratio_subtract = /* unspecified */;
Los alias de plantilla std::ratio_subtract denota el resultado de restar dos fracciones racionales exactos representados por las instancias std::ratio R1 y R2. El resultado std::ratio una instancia donde std::ratio<Num, Denom> Num == R1::num * R2::den - R2::num * R1::den y Denom == R1::den * R2::den .
Original:
The template alias std::ratio_subtract denotes the result of subtracting two exact rational fractions represented by the std::ratio instances R1 and R2. The result a std::ratio instance std::ratio<Num, Denom> where Num == R1::num * R2::den - R2::num * R1::den and Denom == R1::den * R2::den.
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[editar] Tipos de miembros

Miembro de tipo
Original:
Member type
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Definition
type std::ratio<num, den>

[editar] Constantes de miembros

num
[estático]
constexpr valor de tipo std::intmax_t igual a sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
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(público miembro constante estática)
den
[estático]
constexpr valor de tipo std::intmax_t igual a abs(Denom) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(público miembro constante estática)

[editar] Ejemplo

#include <iostream>
#include <ratio>
 
int main()
{
    typedef std::ratio<2, 3> two_third;
    typedef std::ratio<1, 6> one_sixth;
 
    typedef std::ratio_subtract<two_third, one_sixth> diff;
    std::cout << "2/3 - 1/6 = " << diff::num << '/' << diff::den << '\n';
}

Output:

2/3 - 1/6 = 1/2