Std::sin,std::sinf,std::sinl (3) Linux Manual Page

std::sin,std::sinf,std::sinl – std::sin,std::sinf,std::sinl

Synopsis

Defined in header <cmath>
float sin ( float arg );
float sinf( float arg ); (since C++11)
double sin ( double arg ); (1) (2)
long double sin ( long double arg );
long double sinl( long double arg ); (3) (since C++11)
double sin ( IntegralType arg ); (4) (since C++11)
1-3) Computes the sine of arg (measured in radians).
4) A set of overloads or a function template accepting an argument of any integral_type. Equivalent to 2) (the argument is cast to double).

Parameters

arg – value representing angle in radians, of a floating-point or Integral_type

Return value

If no errors occur, the sine of arg (sin(arg)) in the range [-1 ; +1], is returned.
The result may have little or no significance if the magnitude of arg is large (until C++11)
If a domain error occurs, an implementation-defined value is returned (NaN where supported)
If a range error occurs due to underflow, the correct result (after rounding) is returned.

Error handling

Errors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),

* if the argument is ±0, it is returned unmodified
* if the argument is ±∞, NaN is returned and FE_INVALID is raised
* if the argument is NaN, NaN is returned

Notes

The case where the argument is infinite is not specified to be a domain error in C (to which C++ defers), but it is defined as a domain_error_in_POSIX
POSIX also specifies that in case of underflow, arg is returned unmodified, and if that is not supported, an implementation-defined value no greater than DBL_MIN, FLT_MIN, and LDBL_MIN is returned.

Example

// Run this code

#include <iostream>

#include <cmath>

#include <cerrno>

#include <cfenv>
#pragma STDC FENV_ACCESS ON

const double pi = std::acos(-1);

int main()

{
    // typical usage
    std::cout << "sin(pi/6) = " << std::sin(pi / 6) << '\n'
              << "sin(pi/2) = " << std::sin(pi / 2) << '\n'
              << "sin(-3*pi/4) = " << std::sin(-3 * pi / 4) << '\n';
    // special values
    std::cout << "sin(+0) = " << std::sin(0.0) << '\n'
              << "sin(-0) = " << std::sin(-0.0) << '\n';
    // error handling
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout << "sin(INFINITY) = " << std::sin(INFINITY) << '\n';
    if (std::fetestexcept(FE_INVALID))
        std::cout << "    FE_INVALID raised\n";
}

Possible output:

  sin(pi/6) = 0.5
  sin(pi/2) = 1
  sin(-3*pi/4) = -0.707107
  sin(+0) = 0
  sin(-0) = -0
  sin(INFINITY) = -nan
      FE_INVALID raised

std::sin,std::sinf,std::sinl (3) Linux Manual Page