arg() function for Complex Number in C++

The arg() function for complex numbers 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 Type: It returns the argument of the complex number. Below are programs that illustrate the above function:

Example 1:

CPP

// C++ program to demonstrate
// example of arg() function.

#include& lt; bits / stdc++.h & gt;
using namespace std;

int main()
{
    // defines the complex number: (5.0 + 12.0i)
    complex& lt;
    double& gt;
    complexnumber(5.0, 12.0);

    // prints the argument of the complex number
    cout& lt;
    <
    "
    The argument of& quot;
    <
    <
    complexnumber& lt;
    <
    "
is:
    "
    ;
    cout& lt;
    <
    arg(complexnumber) & lt;
    <
    endl;

    return 0;
}

Output:

The argument of (5,12) is: 1.17601

Time Complexity: O(1)
Auxiliary Space: O(1)

Example 2:

CPP

// C++ program to demonstrate
// example of arg() function

#include& lt; bits / stdc++.h & gt;
using namespace std;

int main()
{
    // defines the complex number: (4.0+3.0i)
    complex& lt;
    double& gt;
    complexnumber(4.0, 3.0);

    // prints the argument of the complex number
    cout& lt;
    <
    "
    The argument of& quot;
    <
    <
    complexnumber& lt;
    <
    "
is:
    "
    ;
    cout& lt;
    <
    arg(complexnumber) & lt;
    <
    endl;

    return 0;
}

Output:

The argument of (4,3) is: 0.643501

Time Complexity: O(1)
Auxiliary Space: O(1)