Eroare de compilare: main.cpp:5:12: error: 'cmmdc' was not declared in this scope ifstream f{cmmdc.in}; ^~~~~ main.cpp:5:20: error: no matching function for call to 'std::basic_ifstream<char>::basic_ifstream(<brace-enclosed initializer list>)' ifstream f{cmmdc.in}; ^ In file included from main.cpp:2:0: /usr/include/c++/6/fstream:521:7: note: candidate: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(std::basic_ifstream<_CharT, _Traits>&&) [with _CharT = char; _Traits = std::char_traits<char>] basic_ifstream(basic_ifstream&& __rhs) ^~~~~~~~~~~~~~ /usr/include/c++/6/fstream:521:7: note: conversion of argument 1 would be ill-formed: /usr/include/c++/6/fstream:511:7: note: candidate: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const string&, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::__cxx11::string = std::__cxx11::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode] basic_ifstream(const std::string& __s, ^~~~~~~~~~~~~~ /usr/include/c++/6/fstream:511:7: note: conversion of argument 1 would be ill-formed: /usr/include/c++/6/fstream:495:7: note: candidate: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const char*, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::ios_base::openmode = std::_Ios_Openmode] basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in) ^~~~~~~~~~~~~~ /usr/include/c++/6/fstream:495:7: note: conversion of argument 1 would be ill-formed: /usr/include/c++/6/fstream:481:7: note: candidate: std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char; _Traits = std::char_traits<char>] basic_ifstream() : __istream_type(), _M_filebuf() ^~~~~~~~~~~~~~ /usr/include/c++/6/fstream:481:7: note: candidate expects 0 arguments, 1 provided main.cpp:6:12: error: 'cmmdc' was not declared in this scope ofstream g(cmmdc.out); ^~~~~ main.cpp: In function 'int main()': main.cpp:10:7: error: no match for 'operator<<' (operand types are 'std::ifstream {aka std::basic_ifstream<char>}' and 'int') f<<a<<b; ~^~~ main.cpp:10:7: note: candidate: operator<<(int, int) <built-in> main.cpp:10:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'int' In file included from /usr/include/c++/6/string:52:0, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from main.cpp:1: /usr/include/c++/6/bits/basic_string.h:5343:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) operator<<(basic_ostream<_CharT, _Traits>& __os, ^~~~~~~~ /usr/include/c++/6/bits/basic_string.h:5343:5: note: template argument deduction/substitution failed: main.cpp:10:9: note: 'std::ifstream {aka std::basic_ifstream<char>}' is not derived from 'std::basic_ostream<_CharT, _Traits>' f<<a<<b; ^ In file included from /usr/include/c++/6/bits/ios_base.h:46:0, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, Non zero exit status: 1