From cppreference.com
Defined in header
template<classT,classCharT,classTraits>std::basic_ostream<CharT,Traits>&operator<<(std::basic_ostream<CharT,Traits>&os,conststd::complex<T>&x); (1) template<classT,classCharT,classTraits>std::basic_istream<CharT,Traits>&operator>>(std::basic_istream<CharT,Traits>&is,std::complex<T>&x); (2) 1) Writes to os the complex number in the form (real,imaginary).
2) Reads a complex number from is. The supported formats are
real
(real)
(real,imaginary)
where the input for real and imaginary must be convertible to T.
If an error occurs calls is.setstate(ios_base::failbit).
Exceptions
May throw
on stream errors.
Parameters
os - a character output stream is - a character input stream x - the complex number to be inserted or extracted Return value
1)os
2)is
Notes
1) As the comma may be used in the current locale as decimal separator, the output may be ambiguous. This can be solved with
which forces the decimal separator to be visible.
2) The input is performed as a series of simple formatted extractions. Whitespace skipping is the same for each of them.
Possible implementation
template<classT,classCharT,classTraits>basic_ostream<CharT,Traits>&operator<<(basic_ostream<CharT,Traits>&o,constcomplex<T>&x){basic_ostringstream<CharT,Traits>s;s.flags(o.flags());s.imbue(o.getloc());s.precision(o.precision());s<<'('<<x.real()<<','<<x.imag()<<')';returno<<s.str();}Example
Run this code
#include<complex>#include<iostream>intmain(){std::cout<<std::complex<double>{3.14,2.71}<<'\n';}Possible output:
(3.14,2.71)