cos, cosf, cosl, cosh, coshf, coshl

發行項
06/05/2017

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Calculates the cosine (cos, cosf, or cosl), or hyperbolic cosine (cosh, coshf, or coshl).

Syntax

double cos(   
   double x   
);  
float cos(  
   float x   
);  // C++ only  
long double cos(  
   long double x  
);  // C++ only  
float cosf(   
   float x   
);  
long double cosl(  
   long double x  
);  
double cosh(   
   double x   
);  
float cosh(  
   float x   
);  // C++ only  
long double cosh(  
   long double x  
);  // C++ only  
float coshf(  
   float x   
);  
long double coshl(  
   long double x  
);

Parameters

x
Angle in radians.

Return Value

The cosine or hyperbolic cosine of x. If x is greater than or equal to 263, or less than or equal to –263, a loss of significance in the result of a call to cos, cosf, or cosl occurs.

By default, if the result is too large in a cosh, coshf, or coshl call, the function returns HUGE_VAL and sets errno to ERANGE.

Input	SEH Exception	Matherr Exception
± `QNAN`,`IND`	none	`_DOMAIN`
± ∞ (`cosf`, `cos`, `cosl`)	`INVALID`	`_DOMAIN`
x ≥ 7.104760e+002 (`cosh`, `coshf`, `coshl`)	`INEXACT`+`OVERFLOW`	`OVERFLOW`

Remarks

Because C++ allows overloading, you can call overloads of cos and cosh that take and return float or long double values. In a C program, cos and cosh always take and return a double.

Requirements

Routine	Required header
`cos`, `cosh`, `cosf`, `coshf`, `cosl`, `coshl`	<math.h>

For additional compatibility information, see Compatibility.

Example

See the example in sin, sinf, sinl, sinh, sinhf, sinhl.

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