Immediate Functions in C++

real() function in C++

Last Updated : 08 Oct, 2018

The real() function is defined in the complex header file. The real() function is used to find the real part of the complex number.

Syntax:

template<class T> T 
    real(const complex<T>& z);

Parameter: This method takes a mandatory parameter z: which represents the given complex number.

Return: It returns the real part of the specified complex number.

Below programs illustrate the above function:-

Example 1:-

// C++ program to demonstrate 
// example of real() function. 
  
#include <bits/stdC++.h> 
using namespace std; 
  
// driver function 
int main() 
{ 
    // defines the complex number: (20.3 + 4.9i) 
    complex<double> realpart(20.3, 4.9); 
  
    // print the complex number 
    cout << "Complex Number = "
         << realpart << endl; 
  
    // prints the real part using the real function 
    cout << "Real part of the complex number is ="
         << real(realpart) << endl; 
  
    return 0; 
} 

Output:

Complex Number = (20.3, 4.9)
Real part of the complex number is =20.3

Example 2:-

// C++ program to demonstrate 
// example of real() function. 
  
#include <bits/stdC++.h> 
using namespace std; 
  
// driver function 
int main() 
{ 
    // defines the complex number: (2 + 2i) 
    complex<double> realpart(2, 2); 
  
    // print the complex number 
    cout << "Complex Number = "
         << realpart << endl; 
  
    // prints the real part using the real function 
    cout << "Real part of the complex number is ="
         << real(realpart) << endl; 
  
    return 0; 
} 

Output:

Complex Number = (2, 2)
Real part of the complex number is =2

Immediate Functions in C++

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