std::tan (an abbreviation of 'tangens') is a mathematical STL function that returns the tangens of an inputted value. This value must be supplied in radians.


#include <cmath>

#include <iostream>



int main()

{

  std::cout << std::showpos;

  for(int i = -8; i != 9; ++i)

  {

    const double x = static_cast<double>(i) * (0.125 * M_PI);

    const double y = std::tan(x);

    std::cout << "std::tan(" << i << "/8 pi) = " << y << '\n';

  }

}

Screen output:


std::tan(-8/8 pi) = +1.22461e-16

std::tan(-7/8 pi) = +0.414214

std::tan(-6/8 pi) = +1

std::tan(-5/8 pi) = +2.41421

std::tan(-4/8 pi) = -1.63318e+16

std::tan(-3/8 pi) = -2.41421

std::tan(-2/8 pi) = -1

std::tan(-1/8 pi) = -0.414214

std::tan(+0/8 pi) = +0

std::tan(+1/8 pi) = +0.414214

std::tan(+2/8 pi) = +1

std::tan(+3/8 pi) = +2.41421

std::tan(+4/8 pi) = +1.63318e+16

std::tan(+5/8 pi) = -2.41421

std::tan(+6/8 pi) = -1

std::tan(+7/8 pi) = -0.414214

std::tan(+8/8 pi) = -1.22461e-16

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(C++) std::tan