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C++ Complex Real Numbers

The C++ std::complex::real() function is used to retrieve the real part of a complex number. Complex numbers consists of both real and imaginary components, and this function allow access to the real component. This function is invoked on a complex object and returns a value of the same type as the real part, typically a floating-point.

Following is the syntax for std::complex::real() function.

real (const complex<T>& x);	
double real (ArithmeticType x);

• x − It indicates the complex value.

It returns the real part of the complex number x.

none

In the following example, we are going to consider the basic usage of the real() function.

#include <iostream>
#include <complex>
int main() {
   std::complex < double > x(1.2, 4.1);
   double y = x.real();
   std::cout << "Real part: " << y << std::endl;
   return 0;
}

Output of the above code is as follows −

Real part: 1.2

Consider the following example, where we are going to modify the real part.

#include <iostream>
#include <complex>
int main() {
   std::complex < double > a(2.3, 3.2);
   std::cout << "Before Modification: " << a.real() << std::endl;
   a.real(4.0);
   std::cout << "After Modification: " << a.real() << std::endl;
   return 0;
}

Following is the output of the above code −

Before Modification: 2.3
After Modification: 4

Let's look at the following example, where we are going to use the real() with different data types.

#include <iostream>
#include <complex>
int main() {
   std::complex < float > x(1.1 f, 1.5 f);
   std::complex < long double > y(2.0, 5.0);
   std::cout << "Real part(float): " << x.real() << std::endl;
   std::cout << "Real part(long double): " << y.real() << std::endl;
   return 0;
}

If we run the above code it will generate the following output −

Real part(float): 1.1
Real part(long double): 2

complex.htm

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