| Common mathematical functions | |||||||||||||||||||||||||||||||
| Mathematical special functions(C++17) | |||||||||||||||||||||||||||||||
| Mathematical constants(C++20) | |||||||||||||||||||||||||||||||
| Basic linear algebra algorithms(C++26) | |||||||||||||||||||||||||||||||
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| Floating-point environment(C++11) | |||||||||||||||||||||||||||||||
| Complex numbers | |||||||||||||||||||||||||||||||
Numeric array (valarray) | |||||||||||||||||||||||||||||||
| Pseudo-random number generation | |||||||||||||||||||||||||||||||
| Bit manipulation(C++20) | |||||||||||||||||||||||||||||||
| Saturation arithmetic(C++26) | |||||||||||||||||||||||||||||||
| Factor operations | |||||||||||||||||||||||||||||||
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| Interpolations | |||||||||||||||||||||||||||||||
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| Generic numeric operations | |||||||||||||||||||||||||||||||
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| C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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| Nearest integer floating point operations | |||||||||||||||||||||||||||||||||||||||||
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| Floating point manipulation functions | |||||||||||||||||||||||||||||||||||||||||
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| Classification and comparison | |||||||||||||||||||||||||||||||||||||||||
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| Types | |||||||||||||||||||||||||||||||||||||||||
| Macro constants | |||||||||||||||||||||||||||||||||||||||||
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Defined in header <cmath> | ||
| (1) | ||
float asin(float num); double asin(double num); | (until C++23) | |
/*floating-point-type*/ asin(/*floating-point-type*/ num); | (since C++23) (constexpr since C++26) | |
float asinf(float num); | (2) | (since C++11) (constexpr since C++26) |
longdouble asinl(longdouble num); | (3) | (since C++11) (constexpr since C++26) |
SIMD overload(since C++26) | ||
Defined in header <simd> | ||
template</*math-floating-point*/ V> constexpr/*deduced-simd-t*/<V> | (S) | (since C++26) |
Additional overloads(since C++11) | ||
Defined in header <cmath> | ||
template<class Integer> double asin( Integer num); | (A) | (constexpr since C++26) |
std::asin for all cv-unqualified floating-point types as the type of the parameter.(since C++23)S) The SIMD overload performs an element-wise std::asin onv_num.
| (since C++26) |
A) Additional overloads are provided for all integer types, which are treated asdouble. | (since C++11) |
Contents |
| num | - | floating-point or integer value |
| π |
| 2 |
| π |
| 2 |
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.
Errors are reported as specified inmath_errhandling.
Domain error occurs ifnum is outside the range[-1.0, 1.0].
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
The additional overloads are not required to be provided exactly as(A). They only need to be sufficient to ensure that for their argumentnum of integer type,std::asin(num) has the same effect asstd::asin(static_cast<double>(num)).
#include <cerrno>#include <cfenv>#include <cmath>#include <cstring>#include <iostream> // #pragma STDC FENV_ACCESS ON int main(){std::cout<<"asin(1.0) = "<< asin(1)<<'\n'<<"2*asin(1.0) = "<<2* asin(1)<<'\n'<<"asin(-0.5) = "<< asin(-0.5)<<'\n'<<"6*asin(-0.5) ="<<6* asin(-0.5)<<'\n'; // special valuesstd::cout<<"asin(0.0) = "<< asin(0)<<" asin(-0.0)="<< asin(-0.0)<<'\n'; // error handlingerrno=0;std::feclearexcept(FE_ALL_EXCEPT); std::cout<<"asin(1.1) = "<< asin(1.1)<<'\n'; if(errno==EDOM)std::cout<<" errno == EDOM: "<<std::strerror(errno)<<'\n';if(std::fetestexcept(FE_INVALID))std::cout<<" FE_INVALID raised"<<'\n';}
Possible output:
asin(1.0) = 1.57082*asin(1.0) = 3.14159asin(-0.5) = -0.5235996*asin(-0.5) = -3.14159asin(0.0) = 0 asin(-0.0)=-0asin(1.1) = nan errno == EDOM: Numerical argument out of domain FE_INVALID raised
(C++11)(C++11) | computes arc cosine (\({\small\arccos{x}}\)arccos(x)) (function)[edit] |
(C++11)(C++11) | computes arc tangent (\({\small\arctan{x}}\)arctan(x)) (function)[edit] |
(C++11)(C++11) | arc tangent, using signs to determine quadrants (function)[edit] |
(C++11)(C++11) | computes sine (\({\small\sin{x}}\)sin(x)) (function)[edit] |
(C++11) | computes arc sine of a complex number (\({\small\arcsin{z}}\)arcsin(z)) (function template)[edit] |
| applies the functionstd::asin to each element of valarray (function template)[edit] | |
C documentation forasin | |
