/in/foo.cc: In member function 'Complex& Complex::operator+=(const Complex&)':
/in/foo.cc:21:9: warning: no return statement in function returning non-void [-Wreturn-type]
   20 |                 imag+=other.imag;
  +++ |+  return *this;
   21 |         }
      |         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:46:9: error: 'complex' was not declared in this scope
   46 |         complex c3(real3,imag3);
      |         ^~~~~~~
/in/foo.cc:2:1: note: 'std::complex' is defined in header '<complex>'; did you forget to '#include <complex>'?
    1 | #include <iostream>
  +++ |+#include <complex>
    2 | using namespace std;
/in/foo.cc:47:27: error: 'c3' was not declared in this scope; did you mean 'c2'?
   47 |         Complex sum=c1+c2+c3;
      |                           ^~
      |                           c2