asin, asinf, asinl

项目
06/05/2017

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Calculates the arcsine.

Syntax

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

Parameters

x
Value whose arcsine is to be calculated.

Return Value

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

By default, if x is less than –1 or greater than 1, asin returns an indefinite.

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

Remarks

Because C++ allows overloading, you can call overloads of asin with float and long double values. In a C program, asin always takes and returns a double.

Requirements

Routine	Required header
`asin`, `asinf`, `asinl`	<math.h>

Example

For more information, see acos, acosf, acosl.

.NET Framework Equivalent

System::Math::Asin

通过