std::floor - cppreference.com
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      std::floor

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      <metanoindex/>

       
      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
      Original:
      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)
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      (C++11)
      (C++11)
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      (C++11)
      (C++11)(C++11)(C++11)
      Funções exponenciais
      Original:
      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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      (C++11)
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      Número inteiro mais próximo de operações de ponto flutuante
      Original:
      Nearest integer floating point operations
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      (C++11)(C++11)(C++11)
      (C++11)
      (C++11)
      (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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      Constantes de macros
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      Macro constants
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      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      float floor( float arg );
      double floor( double arg );
      long double floor( long double arg );
      double floor( Integral arg );
      		 (desde C++11)
      Calcula inteiro mais próximo não superior a arg.
      Original:
      Computes nearest integer not greater than arg.
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      Parâmetros

      arg -
      flutuando valor de ponto
      Original:
      floating point value
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      Valor de retorno

      Mais próximo número inteiro não superior a arg
      Original:
      Nearest integer not greater than arg
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      [[Image:
      Valor de retorno
      Original:
      {{{2}}}
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      |200x200px]]
      Argument

      Notas

      O valor inteiro pode ser sempre representado pelo tipo de dado ponto flutuante.
      Original:
      The integer value can be always represented by the given floating point type.
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      Exemplo

      #include <cmath>
#include <iostream>
 
int main()
{
    std::cout << std::fixed;
    std::cout << std::floor(12.0) << '\n';
    std::cout << std::floor(12.1) << '\n';
    std::cout << std::floor(12.5) << '\n';
    std::cout << std::floor(12.9) << '\n';
    std::cout << std::floor(13.0) << '\n';
}

      Saída: 

      12.000000
12.000000
12.000000
12.000000
13.000000

      Veja também