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real

  • 아티클

Extracts the real component of a complex number.

template<class T> 
   T real( 
      constexpr complex<T>& ComplexNum 
   );

Parameters

  • ComplexNum
    The complex number whose real part is to be extracted.

Return Value

The real part of the complex number as a global function.

Remarks

This template function cannot be used to modify the real part of the complex number. To change the real part, a new complex number must be assigned the component value.

Example

// complex_real.cpp
// compile with: /EHsc
#include <complex>
#include <iostream>

int main( )
{
   using namespace std;
   complex <double> c1 ( 4.0 , 3.0 );
   cout << "The complex number c1 = " << c1 << endl;

   double dr1 = real ( c1 );
   cout << "The real part of c1 is real ( c1 ) = "
        << dr1 << "." << endl;

   double di1 = imag ( c1 );
   cout << "The imaginary part of c1 is imag ( c1 ) = "
        << di1 << "." << endl;
}

The complex number c1 = (4,3)
The real part of c1 is real ( c1 ) = 4.
The imaginary part of c1 is imag ( c1 ) = 3.

Requirements

Header: <complex>

Namespace: std