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  1. // Example program
  2. #include <iostream>
  3. #include <string>
  4. #include <cmath>
  5.  
  6. int main()
  7. {
  8.     double x = 0.5; // linear to frequency conversion
  9.  
  10.     const double d = 3.0; // decades per scale
  11.     const double ten2d = std::pow (10, d);
  12.     std::cout << x << "\n";
  13.  
  14.     x = (std::pow (ten2d, x) - 1) / (ten2d - 1);
  15.     std::cout << x << "\n";
  16.  
  17.     x = 20.0 + (20000.0 - 20.0) * x;
  18.     std::cout << x << "\n";
  19.  
  20.     x = (x - 20.0) / (20000.0 - 20.0);
  21.     std::cout << x << "\n";
  22.  
  23.     x = (std::log10 ((x * (ten2d - 1)) + 1)) / std::log10 (ten2d); // inverse
  24.     std::cout << x << "\n";
  25.  
  26.  
  27. }
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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0.5
0.0306534
632.456
0.0306534
0.5
https://ideone.com/4ZcvSm
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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