std::ratio - cppreference.com
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      std::ratio

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      C++
       
      Biblioteca numéricos
      Funções matemáticas comuns
      De ponto flutuante ambiente
      Números complexos
      Matrizes numéricas
      Pseudo-aleatório de geração de números
      Tempo de compilação aritmética racional (C++11)
      Genéricos operações numéricas
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      Generic numeric operations
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      (C++11)
       
      Compilar hora aritmética racional
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      Aritmética
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      Arithmetic
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      (C++11)
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      Comparação
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      Comparison
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      (C++11)
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      <tbody> </tbody>
      Definido no cabeçalho <ratio>
      template< std::intmax_t Num, std::intmax_t Denom = 1 > class ratio;
      		 (desde C++11)

      The class template std::ratio provides compile-time rational arithmetic support. Each instantiation of this template exactly represents any finite rational number as long as its numerator Num and denominator Denom are representable as compile-time constants of type std::intmax_t. In addition, Denom may not be zero and may not be equal to the most negative value. Both numerator and denominator are automatically reduced to the lowest terms.

      Typedefs conveniência vários que correspondem aos índices de SI são fornecidos pela biblioteca padrão:
      Original:
      Several convenience typedefs that correspond to the SI ratios are provided by the standard library:
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      Defined in header <ratio>
      Tipo
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      Type
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      		 Definition
      yocto
      std::ratio<1, 1000000000000000000000000>, se std::intmax_t pode representar o denominador
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      std::ratio<1, 1000000000000000000000000>, if std::intmax_t can represent the denominator
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      zepto
      std::ratio<1, 1000000000000000000000>, se std::intmax_t pode representar o denominador
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      std::ratio<1, 1000000000000000000000>, if std::intmax_t can represent the denominator
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      atto std::ratio<1, 1000000000000000000>
      femto std::ratio<1, 1000000000000000>
      pico std::ratio<1, 1000000000000>
      nano std::ratio<1, 1000000000>
      micro std::ratio<1, 1000000>
      milli std::ratio<1, 1000>
      centi std::ratio<1, 100>
      deci std::ratio<1, 10>
      deca std::ratio<10, 1>
      hecto std::ratio<100, 1>
      kilo std::ratio<1000, 1>
      mega std::ratio<1000000, 1>
      giga std::ratio<1000000000, 1>
      tera std::ratio<1000000000000, 1>
      peta std::ratio<1000000000000000, 1>
      exa std::ratio<1000000000000000000, 1>
      zetta
      std::ratio<1000000000000000000000, 1>, se std::intmax_t pode representar o numerador
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      std::ratio<1000000000000000000000, 1>, if std::intmax_t can represent the numerator
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      yotta
      std::ratio<1000000000000000000000000, 1>, se std::intmax_t pode representar o numerador
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      std::ratio<1000000000000000000000000, 1>, if std::intmax_t can represent the numerator
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      Tipos de membro

      Tipo de membro
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      Member type
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      		 Definition
      type std::ratio<num, den>

      Objetos Membros