C++ <complex> - imag() Function

The C++ complex::imag function is used to access the imaginary part of the complex number. It can be used for two purpose:

to return the imaginary part of the complex number.
to set the imaginary part of the complex number.

Syntax

C++98
C++11

//get the imaginary part of complex number
T imag() const;

//version 1 - get the imaginary 
//part of complex number
T imag() const; 

//version 2 - set the imaginary 
//part of complex number
void imag (T val);

Parameters

val Specify the value to set the imaginary part of the complex number.

Return Value

Returns the imaginary part of the complex number in version 1 and nothing in version 2.

Example:

The example below shows the usage of complex::imag function.

#include <iostream>
#include <complex>
using namespace std;
 
int main (){
  complex<int> z (5, 10);

  //display the imaginary part of 
  //the complex number
  cout<<"Imaginary part of z: "<<
      z.imag()<<"\n";

  //changing the imaginary part
  z.imag(100);
  
  //display the imaginary part of 
  //the complex number
  cout<<"Imaginary part of z: "<<
      z.imag()<<"\n";

  return 0;
}

The output of the above code will be:

Imaginary part of z: 10
Imaginary part of z: 100

❮ C++ <complex> Library