real() function in C++

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 ` `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 ` `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
```

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