std::sin,std::sinf,std::sinl (3) - Linux Manuals

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


std::sin,std::sinf,std::sinl - std::sin,std::sinf,std::sinl


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).


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


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.


// Run this code

  #include <iostream>
  #include <cmath>
  #include <cerrno>
  #include <cfenv>

  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::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

See also

cosl computes cosine (cos(x))


tanl computes tangent (tan(x))


asinl computes arc sine (arcsin(x))

                   computes sine of a complex number (sin(z))
sin(std::complex) (function template)
                   applies the function std::sin to each element of valarray
sin(std::valarray) (function template)