asinh, asinhf, asinhl

[アーティクル]
06/05/2017

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Calculates the inverse hyperbolic sine.

Syntax

double asinh(  
   double x   
);  
float asinh(  
   float x   
);  // C++ only  
long double asinh(  
   long double x  
);  // C++ only  
float asinhf(  
   float x   
);  
long double asinhl(  
   long double x  
);

Parameters

x
Floating-point value.

Return Value

The asinh functions return the inverse hyberbolic sine (arc hyperbolic sine) of x. This function is valid over the floating-point domain. If x is a quiet NaN, indefinite, or infinity, the same value is returned.

Input	SEH Exception	`_matherr` Exception
± QNAN, IND, INF	none	none

Remarks

When you use C++, you can call overloads of asinh that take and return float or long double values. In a C program, asinh always takes and returns double.

Requirements

Function	C header	C++ header
`asinh`, `asinhf`, `asinhl`	<math.h>	<cmath>

For additional compatibility information, see Compatibility.

Example

// crt_asinh.c  
// Compile by using: cl /W4 crt_asinh.c  
// This program displays the hyperbolic sine of pi / 4  
// and the arc hyperbolic sine of the result.  
  
#include <math.h>  
#include <stdio.h>  
  
int main( void )  
{  
   double pi = 3.1415926535;  
   double x, y;  
  
   x = sinh( pi / 4 );  
   y = asinh( x );  
   printf( "sinh( %f ) = %f\n", pi/4, x );  
   printf( "asinh( %f ) = %f\n", x, y );  
}

sinh
( 0.785398 ) = 0.868671  
asinh
( 0.868671 ) = 0.785398

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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