arg() function for Complex Number in C++

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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