Eroare de compilare: main.cpp:1:20: warning: extra tokens at end of #include directive #include <iostream>; ^ main.cpp: In function 'int main()': main.cpp:6:22: error: invalid use of incomplete type 'std::fstream {aka class std::basic_fstream<char>}' fstream("adunare.in") ^ In file included from /usr/include/c++/6/ios:38:0, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from main.cpp:1: /usr/include/c++/6/iosfwd:122:11: note: declaration of 'std::fstream {aka class std::basic_fstream<char>}' class basic_fstream; ^~~~~~~~~~~~~ main.cpp:5:6: warning: unused variable 'a' [-Wunused-variable] int a, b; ^ main.cpp:5:9: warning: unused variable 'b' [-Wunused-variable] int a, b; ^ Non zero exit status: 1