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arg() function for Complex Number in C++

  • Last Updated : 11 Oct, 2018

The arg() function for complex number is defined in the complex header file. This function is used to return the argument of the complex number z.

Syntax:

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

Parameter:

  • z: It represents the given complex number.

Return: It returns the argument of the complex number.

Below programs illustrate the above function:-



Example 1:




// C++ program to demonstrate
// example of arg() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main ()
{
  // defines the complex number: (5.0 + 12.0i)
  complex<double> complexnumber (5.0, 12.0);
  
  // prints the argument of the complex number
  cout << "The argument of " << complexnumber << " is: ";
  cout << arg(complexnumber) << endl;
  
  return 0;
}
Output:
The argument of (5,12) is: 1.17601

Example 2:




// C++ program to demonstrate
// example of arg() function
  
#include <bits/stdc++.h>
using namespace std;
  
int main ()
{
  // defines the complex number: (4.0+3.0i)
  complex<double> complexnumber (4.0, 3.0);
  
  // prints the argument of the complex number
  cout << "The argument of " << complexnumber << " is: ";
  cout << arg(complexnumber) << endl;
  
  return 0;
}
Output:
The argument of (4,3) is: 0.643501
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