std::exp is am STL math function to obtain the natural logarithm of a value.


#include <cmath>

#include <iostream>



int main()

{

  //Set output to fixed length

  std::cout << std::fixed;

  for (double x = 0.0; x < 1.0; x+=0.1)

  {

    const double y = std::exp(x);

    std::cout

      << "std::exp(" << x << ") = "

      << y << '\n';

  }

}

Screen output:


std::exp(0.000000) = 1.000000

std::exp(0.100000) = 1.105171

std::exp(0.200000) = 1.221403

std::exp(0.300000) = 1.349859

std::exp(0.400000) = 1.491825

std::exp(0.500000) = 1.648721

std::exp(0.600000) = 1.822119

std::exp(0.700000) = 2.013753

std::exp(0.800000) = 2.225541

std::exp(0.900000) = 2.459603

std::exp(1.000000) = 2.718282

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(C++) std::exp