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  1. #include <fstream>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. double polyeval(const double* polyarray, double x, int arraySize) {
  6.     if(arraySize <= 0) { return 0; }
  7.     double value = 0;
  8.     const double * p = polyarray + (arraySize-1);
  9.     for(int i=0; i<arraySize; ++i) {
  10.         value *= x;
  11.         value += *p;
  12.         p--;
  13.     }
  14.     return value;
  15. }
  16.  
  17. int main () {
  18.  
  19.     const int arraySize = 3;
  20.  
  21.     const double polyarrayA[3] = {0.0,0.0,1.0}; // 0 x^2 + 0 x + 1
  22.     const double polyarrayB[3] = {0.0,1.0,0.0}; // 0 x^2 + 1 x + 0
  23.     const double polyarrayC[3] = {1.0,0.0,0.0}; // 1 x^2 + 0 x + 1
  24.  
  25.     cout << "Polynomial Evaluation A f(x) = " << polyeval(polyarrayA, 0.5, arraySize)<<std::endl;
  26.     cout << "Polynomial Evaluation B f(x) = " << polyeval(polyarrayB, 0.5, arraySize)<<std::endl;    
  27.     cout << "Polynomial Evaluation C f(x) = " << polyeval(polyarrayC, 0.5, arraySize)<<std::endl;    
  28.  
  29.  
  30. }
  31.  
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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Polynomial Evaluation A f(x) = 0.25
Polynomial Evaluation B f(x) = 0.5
Polynomial Evaluation C f(x) = 1
https://ideone.com/HE4r6x
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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