creal, crealf, creall

项目
06/05/2017

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The latest version of this topic can be found at creal, crealf, creall.

Retrieves the real part of a complex number.

Syntax

double creal(   
   _Dcomplex z   
);  
float creal(   
   _Fcomplex z   
);  // C++ only  
long double creal(   
   _Lcomplex z   
);  // C++ only  
float crealf(   
   _Fcomplex z   
);  
long double creall(   
  _Lcomplex z   
);

Parameters

z
A complex number.

Return Value

The real part of z.

Remarks

Because C++ allows overloading, you can call overloads of creal that take _Fcomplex or _Lcomplex values, and return float or long double values. In a C program, creal always takes a _Dcomplex value and returns a double value.

Requirements

Routine	C header	C++ header
`creal`, `crealf`, `creall`	<complex.h>	<ccomplex>

For more compatibility information, see Compatibility in the Introduction.

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