From cppreference.com
Defined in header
floatsin(floatnum);doublesin(doublenum);longdoublesin(longdoublenum); (1)(until C++23)/*floating-point-type*/sin(/*floating-point-type*/num);(since C++23)
(constexpr since C++26)floatsinf(floatnum); (2)(since C++11)
(constexpr since C++26)longdoublesinl(longdoublenum); (3)(since C++11)
(constexpr since C++26)
(since C++26)
Defined in header
template</*math-floating-point*/V>constexpr/*deduced-simd-t*/<V>sin(constV&v_num); (S) (since C++26)
(since C++11)
Defined in header
template<classInteger>doublesin(Integernum); (A)(constexpr since C++26)1-3) Computes the sine of num (measured in radians). The library provides overloads of std::sin for all cv-unqualified floating-point types as the type of the parameter.(since C++23)
A) Additional overloads are provided for all integer types, which are treated as double.
(since C++11)Parameters
num - floating-point or integer value representing angle in radians Return value
If no errors occur, the sine of num (sin(num)) in the range [-1, +1], is returned.
The result may have little or no significance if the magnitude of num 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
.
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
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
.
POSIX also specifies that in case of underflow, num is returned unmodified, and if that is not supported, an implementation-defined value no greater than
,
, and
is returned.
The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of integer type, std::sin(num) has the same effect as std::sin(static_cast<double>(num)).
Example
Run this code
#include<cerrno>#include<cfenv>#include<cmath>#include<iomanip>#include<iostream>// #pragma STDC FENV_ACCESS ONconstdoublepi=std::acos(-1);// or std::numbers::pi since C++20constexprdoubleyour_sin(doublex){doublesin{0},pow{x};for(autofac{1LLU},n{1ULL};n!=20;fac*=++n,pow*=x)if(n&1)sin+=(n&2?-pow:pow)/fac;returnsin;}intmain(){std::cout<<std::setprecision(10)<<std::showpos<<"Typical usage:\n"<<"std::sin(pi/6) = "<<std::sin(pi/6)<<'\n'<<"your sin(pi/6) = "<<your_sin(pi/6)<<'\n'<<"std::sin(pi/2) = "<<std::sin(pi/2)<<'\n'<<"your sin(pi/2) = "<<your_sin(pi/2)<<'\n'<<"std::sin(-3*pi/4) = "<<std::sin(-3*pi/4)<<'\n'<<"your sin(-3*pi/4) = "<<your_sin(-3*pi/4)<<'\n'<<"Special values:\n"<<"std::sin(+0) = "<<std::sin(0.0)<<'\n'<<"std::sin(-0) = "<<std::sin(-0.0)<<'\n';// error handlingstd::feclearexcept(FE_ALL_EXCEPT);std::cout<<"std::sin(INFINITY) = "<<std::sin(INFINITY)<<'\n';if(std::fetestexcept(FE_INVALID))std::cout<<" FE_INVALID raised\n";}Possible output:
Typical usage: std::sin(pi/6) = +0.5 your sin(pi/6) = +0.5 std::sin(pi/2) = +1 your sin(pi/2) = +1 std::sin(-3*pi/4) = -0.7071067812 your sin(-3*pi/4) = -0.7071067812 Special values: std::sin(+0) = +0 std::sin(-0) = -0 std::sin(INFINITY) = -nan FE_INVALID raised See also
(C++11)(C++11)
computes cosine (cos(x))
(function)
(C++11)(C++11)
computes tangent (tan(x))
(function)
(C++11)(C++11)
computes arc sine (arcsin(x))
(function)
computes sine of a complex number (sin(z))
(function template)
applies the function
to each element of valarray
(function template)
for sin