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      crealf, creal, creall

      From cppreference.com
      <c‎ |numeric‎ |complex
       
       
       
      Complex number arithmetic
      Types and the imaginary constant
      (C99)
      (C99)    
      (C11)
      (C99)
      Manipulation
      (C99)
      creal
      (C99)
      (C99)
      (C99)
      (C99)
      (C99)
      Power and exponential functions
      (C99)
      (C99)
      (C99)
      (C99)
      Trigonometric functions
      (C99)
      (C99)
      (C99)
      (C99)
      (C99)
      (C99)
      Hyperbolic functions
      (C99)
      (C99)
      (C99)
      (C99)
      (C99)
      (C99)
       
      Defined in header<complex.h>
      float       crealf(floatcomplex z);
      		 (1)(since C99)
      double      creal(doublecomplex z);
      		 (2)(since C99)
      longdouble creall(longdoublecomplex z);
      		 (3)(since C99)
      Defined in header<tgmath.h>
      #define creal( z )
      		 (4)(since C99)
      1-3) Returns the real part ofz.
      4) Type-generic macro: ifz has typelongdoublecomplex,longdoubleimaginary, orlongdouble,creall is called. Ifz has typefloatcomplex,floatimaginary, orfloat,crealf is called. Ifz has typedoublecomplex,doubleimaginary,double, or any integer type,creal is called.

      Contents

      [edit]Parameters

      z - complex argument

      [edit]Return value

      The real part ofz.

      This function is fully specified for all possible inputs and is not subject to any errors described inmath_errhandling

      [edit]Notes

      For any complex variablez,z== creal(z)+ I*cimag(z).

      [edit]Example

      Run this code
      #include <stdio.h>#include <complex.h> int main(void){doublecomplex z=1.0+2.0*I;printf("%f%+fi\n", creal(z),cimag(z));}

      Output:

      1.000000+2.000000i

      [edit]References

      • C11 standard (ISO/IEC 9899:2011):
      • 7.3.9.6 The creal functions (p: 198-199)
      • 7.25 Type-generic math <tgmath.h> (p: 373-375)
      • G.7 Type-generic math <tgmath.h> (p: 545)
      • C99 standard (ISO/IEC 9899:1999):
      • 7.3.9.5 The creal functions (p: 180)
      • 7.22 Type-generic math <tgmath.h> (p: 335-337)
      • G.7 Type-generic math <tgmath.h> (p: 480)

      [edit]See also

      (C99)(C99)(C99)
      		 computes the imaginary part a complex number
      (function)[edit]
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