C++ Complex::imag() function

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The C++ std::complex::imag() function is used to retrieve the imaginary part of a complex number. It works with the complex class template, which represents and manipulates complex numbers. It returns the imaginary component of the complex number as a floating point value, without modifying the object.

Syntax

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

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

Parameters

• x − It indicates the complex value.

Return Value

It returns the imaginary part of the complex number x.

Exceptions

none

Example 1

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

#include <iostream>
#include <complex>
int main() {
   std::complex < double > x(1.0, 2.3);
   std::cout << "Imaginary part: " << x.imag() << std::endl;
   return 0;
}

Output

Following is the output of the above code −

Imaginary part: 2.3

Example 2

Consider the following example, where we are going to use the imag() with the default imaginary part.

#include <iostream>
#include <complex>
int main() {
   std::complex < double > a(1.2);
   std::cout << "Imaginary part: " << a.imag() << std::endl;
   return 0;
}

Output

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

Imaginary part: 0

Example 3

Let's look at the following example, where we are going to modify the imaginary part.

#include <iostream>
#include <complex>
int main() {
   std::complex < float > a(1.2, 1.3);
   std::cout << "Before Modification: " << a.imag() << std::endl;
   a = std::complex < float > (a.real(), 2.4);
   std::cout << "After Modification: " << a.imag() << std::endl;
   return 0;
}

Output

Output of the above code is as follows −

Before Modification: 1.3
After Modification: 2.4