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  1. #include <iostream>
  2. #include <complex>
  3. #include <map>
  4.  
  5. struct Level
  6. {
  7.     long double coefficient;
  8.     size_t exponent;
  9.  
  10.     Level(long double ld = 0, size_t s = 0): //default: Summe, 0
  11.     coefficient(ld), exponent(s) {}
  12.  
  13.     long double operator()(long double x)
  14.     {
  15.             return coefficient * std::pow(x, exponent);
  16.     }
  17. };
  18.  
  19. bool operator<(Level const& a, Level const& b)
  20. {
  21.         return a.exponent < b.exponent;
  22. }
  23. bool operator==(Level const& a, Level const& b)
  24. {
  25.         return a.exponent == b.exponent;
  26. }
  27.  
  28. //Template-Meta Version?
  29. class Polynom
  30. {
  31.     std::map<size_t, Level> mLevels;//Redundanz-Pegel: 4/10 :D
  32.     size_t const mNLevel;
  33.  
  34. public:
  35.  
  36.         template<typename it_t>
  37.         Polynom(it_t a, it_t b):
  38.         mLevels(a, b),
  39.         mNLevel(mLevels.size()) 
  40.         {
  41. 		for(size_t a(0) ; a < mLevels.size(); ++a) //Range-Based for in C++11 - bin zu faul zum iterieren :p
  42.        		mLevels[a].exponent = a;
  43. 	}
  44.  
  45.         long double operator()(long double X)
  46.         {
  47.                 long double sum(0);
  48.                 for(size_t a(0) ; a < mLevels.size(); ++a) //Range-Based for in C++11 - bin zu faul zum iterieren :p
  49.                         sum += mLevels[a](X);
  50.  
  51.                 return sum;
  52.         }
  53. };
  54.  
  55. int main()
  56. {
  57.         std::map<size_t, Level> v;
  58.         v[2] = 3;
  59.         v[1] = 9;
  60.         v[0] = 3.41;
  61. 	//Die Funktion lautet: 3x zum Quadrat + 2x + 3.41
  62.  
  63.         Polynom p(v.begin(), v.end());
  64.  
  65.         std::cout << p(1) << '\n';
  66. }
Success #stdin #stdout 0s 3020KB
comments (?)
stdin 
Standard input is empty
stdout 
15.41
https://ideone.com/OT4Ym
language:
C++14 (gcc 8.3)
created:
14 years ago
visibility:
public

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