C++ complex numbers, what is the right format?

Question

I want to use C++ with complex numbers. Therefore I included #include . Now my question is: How do I declare a variable?(so what is the format ca

Answer 1

The constructor of std::complex has two parameters:

• The first, wich has the real part of the number.
• The second, wich has the imaginary part of the number.

For example:

std::complex my_complex(1,1); //1 + 1i 

Also, C++11 introduces user defined literals, wich allows us to implement (Or be implemented by the standard library, as in this C++14 accepted proposal) a literal for easy-to-use complex numbers:

constexpr std::complex operator"" i(float d)
{
    return std::complex{0.0L,static_cast( d )};
}

You could use this as follows:

auto my_complex = 1i; // 0 + 1i