std::fdim - cppreference.com
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      std::fdim

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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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      Funções matemáticas comuns
      Funções
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      Functions
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      Operações básicas
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      Basic operations
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      (C++11)(C++11)(C++11)
      Funções exponenciais
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      Exponential functions
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      Funções de poder
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      Power functions
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      Funções trigonométricas e hiperbólicas
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      Trigonometric and hyperbolic functions
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      Erro e funções gamma
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      Error and gamma functions
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      Número inteiro mais próximo de operações de ponto flutuante
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      Nearest integer floating point operations
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      (C++11)(C++11)(C++11)
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      (C++11)(C++11)(C++11)
      Flutuando funções de manipulação de pontos
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      Floating point manipulation functions
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      Classificação / Comparação
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      Classification/Comparison
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      (C++11)
      Constantes de macros
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      Macro constants
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      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      float fdim( float x, float y );
      		 (1) (desde C++11)
      double fdim( double x, double y );
      		 (2) (desde C++11)
      long double fdim( long double x, long double y );
      		 (3) (desde C++11)
      Promoted fdim( Arithmetic x, Arithmetic y );
      		 (4) (desde C++11)
      Retorna a diferença positiva entre x e y.
      Original:
      Returns the positive difference between x and y.
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      Isto pode ser implementado como fmax (x - y, 0), por isso, se x ≤ y, o resultado é sempre igual a 0, caso contrário é x - y.
      Original:
      This could be implemented as fmax (x - y, 0), so if x ≤ y, the result is always equals to 0, otherwise it is x - y.
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      4)

      Se algum argumento tem tipo integral, ele é convertido para double. Se qualquer outro argumento é long double, em seguida, o tipo de retorno é long double, caso contrário é double.
      Original:
      If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double.
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      Parâmetros

      x, y -
      flutuando valor de ponto
      Original:
      floating point value
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      Valor de retorno

      O valor da diferença positiva.
      Original:
      The positive difference value.
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