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asin, asinf
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asin, asinf

Calculates the arcsine.

double asin( 
   double x 
);
float asin(
   float x
);  // C++ only
long double asin(
   long double x
);  // C++ only
float asinf ( 
   float x 
);

Parameter

x
Value whose arcsine is to be calculated.

Return Value

The asin function returns the arcsine of x in the range –π/2 to π/2 radians.

If x is less than –1 or greater than 1, asin returns an indefinite by default.

Input SEH Exception Matherr Exception
± ∞ INVALID _DOMAIN
± QNAN,IND none _DOMAIN
|x|>1 INVALID _DOMAIN

Remarks

C++ allows overloading, so you can call overloads of asin. In a C program, asin always takes and returns a double.

Requirements

Routine Required header Compatibility
asin, asinf <math.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Example

See acos, acosf for a sample of using asin.

See Also

Floating-Point Support Routines | acos | atan | cos | _matherr, sin | tan | Run-Time Routines and .NET Framework Equivalents

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