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      std::setprecision

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      < cpp‎ | io‎ | manip

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      Déclaré dans l'en-tête <iomanip>
      /*unspecified*/ setprecision(int n );
      Lorsqu'il est utilisé dans une expression out << setprecision(n) ou in >> setprecision(n), définit le paramètre precision du flux out ou in exactement n .
      Original:
      When used in an expression out << setprecision(n) or in >> setprecision(n), sets the precision parameter of the stream out or in to exactly n.
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      Sommaire

      [modifier]Paramètres

      n -
      nouvelle valeur pour la précision
      Original:
      new value for precision
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      [modifier]Retourne la valeur

      Retourne un objet de type non précisé de sorte que si str est le nom d'un flux de sortie de std::basic_ostream<CharT, Traits> type ou un flux d'entrée de std::basic_istream<CharT, Traits> type, alors l'expression str << setprecision(n) ou str >> setprecision(n) se comporte comme si le code suivant est exécuté:
      Original:
      Returns an object of unspecified type such that if str is the name of an output stream of type std::basic_ostream<CharT, Traits> or an input stream of type std::basic_istream<CharT, Traits>, then the expression str << setprecision(n) or str >> setprecision(n) behaves as if the following code was executed:
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      str.precision(n);

      [modifier]Exemple

      #include <iostream>#include <iomanip>#include <cmath>#include <limits>int main(){constlongdouble pi =std::acos(-1.L);std::cout<<"default precision (6): "<< pi <<'\n'<<"std::precision(10): "<< std::setprecision(10)<< pi <<'\n'<<"max precision: "<< std::setprecision(std::numeric_limits<longdouble>::digits10)<< pi <<'\n';}

      Résultat : 

      default precision (6): 3.14159 std::precision(10): 3.141592654 max precision: 3.14159265358979324

      [modifier]Voir aussi



      (C++11)
      (C++11)
      changements de formatage utilisés pour virgule flottante I / O
      Original:
      changes formatting used for floating-point I/O
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      (fonction)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/io/manip/setprecision&oldid=48421 »
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