|
|
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Defined in header <math.h> | ||
float sinf(float arg); | (1) | (since C99) |
double sin(double arg); | (2) | |
longdouble sinl(longdouble arg); | (3) | (since C99) |
_Decimal32 sind32( _Decimal32 arg); | (4) | (since C23) |
_Decimal64 sind64( _Decimal64 arg); | (5) | (since C23) |
_Decimal128 sind128( _Decimal128 arg); | (6) | (since C23) |
Defined in header <tgmath.h> | ||
#define sin( arg ) | (7) | (since C99) |
sinl) is called. Otherwise, if the argument has integer type or the typedouble,(2) (sin) is called. Otherwise,(1) (sinf) is called. If the argument is complex, then the macro invokes the corresponding complex function (csinl,csin,csinf).The functions(4-6) are declared if and only if the implementation predefines | (since C23) |
Contents |
| arg | - | floating-point value representing an angle in radians |
If no errors occur, the sine ofarg (sin(arg)) in the range[-1 ; +1], is returned.
The result may have little or no significance if the magnitude ofarg is large. | (until C99) |
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.
If the implementation supports IEEE floating-point arithmetic (IEC 60559):
The case where the argument is infinite is not specified to be a domain error in C, but it is defined as adomain 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 thanDBL_MIN,FLT_MIN, andLDBL_MIN is returned.
#include <errno.h>#include <fenv.h>#include <math.h>#include <stdio.h> #ifndef __GNUC__#pragma STDC FENV_ACCESS ON#endif int main(void){constdouble pi=acos(-1); // typical usageprintf("sin(pi/6) = %f\n", sin(pi/6));printf("sin(pi/2) = %f\n", sin(pi/2));printf("sin(-3*pi/4) = %f\n", sin(-3* pi/4)); // special valuesprintf("sin(+0) = %f\n", sin(0.0));printf("sin(-0) = %f\n", sin(-0.0)); // error handlingfeclearexcept(FE_ALL_EXCEPT);printf("sin(INFINITY) = %f\n", sin(INFINITY));if(fetestexcept(FE_INVALID))puts(" FE_INVALID raised");}
Possible output:
sin(pi/6) = 0.500000sin(pi/2) = 1.000000sin(-3*pi/4) = -0.707107sin(+0) = 0.000000sin(-0) = -0.000000sin(INFINITY) = -nan FE_INVALID raised
(C99)(C99) | computes cosine (\({\small\cos{x} }\)cos(x)) (function)[edit] |
(C99)(C99) | computes tangent (\({\small\tan{x} }\)tan(x)) (function)[edit] |
(C99)(C99) | computes arc sine (\({\small\arcsin{x} }\)arcsin(x)) (function)[edit] |
(C99)(C99)(C99) | computes the complex sine (function)[edit] |
C++ documentation forsin | |
