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      std::atan2

      De cppreference.com
      < cpp‎ | numeric‎ | math

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      </div>
      Déclaré dans l'en-tête <cmath>
      float       atan2(float y, float x );
      		 (1)
      double      atan2(double y, double x );
      		 (2)
      longdouble atan2(longdouble y, longdouble x );
      		 (3)
      Promoted    atan2( Arithmetic y, Arithmetic x );
      		 (4) (depuis C++11)
      Calcule la tangente inverse de y/x en utilisant les signes d'arguments pour déterminer correctement le quadrant .
      Original:
      Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.
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      4)
      Si un argument est de type intégral, il est jeté à double. Si aucun autre argument est longdouble, puis le type de retour est longdouble, sinon il est double .
      Original:
      If any argument has integral type, it is cast to double. If any other argument is longdouble, then the return type is longdouble, otherwise it is double.
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      Sommaire

      [modifier]Paramètres

      x, y -
      valeur du point flottant
      Original:
      floating point value
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      [modifier]Retourne la valeur

      Arc tangente de y/x en radians dans l'intervalle de radians [-π; π] .
      Original:
      Arc tangent of y/x in radians in the range of [-π; π] radians.
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      Return value
      math-atan2.png
      X argument

      [modifier]Exemple

      #include <cmath>#include <utility>#include <iostream>   std::pair<double, double> cartesian_to_polar(double x, double y){return{std::hypot(x, y), std::atan2(y,x)};}   int main(){std::pair<double, double> polar = cartesian_to_polar(1, 1);std::cout<<"(1,1) cartesian is ("<< polar.first<<","<< polar.second<<") polar\n";}

      Résultat : 

      (1,1) cartesian is (1.41421,0.785398) polar


      [modifier]Voir aussi

      calcule l'arc tangente (arctan(x))
      Original:
      computes arc tangent (arctan(x))
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      (fonction)[edit]
      arcsinus calcule (arcsin(x))
      Original:
      computes arc sine (arcsin(x))
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      (fonction)[edit]
      calcule l'arc cosinus (arccos(x))
      Original:
      computes arc cosine (arccos(x))
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      (fonction)[edit]
      calcule la tangente (tan(x))
      Original:
      computes tangent (tan(x))
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      (fonction)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/math/atan2&oldid=48823 »
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