Eroare de compilare: user.cpp:1:21: error: iostream.h: No such file or directory user.cpp:4:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:13: error: ‘ifstream’ was not declared in this scope user.cpp:13: error: expected ‘;’ before ‘f’ user.cpp:14: error: ‘ofstream’ was not declared in this scope user.cpp:14: error: expected ‘;’ before ‘g’ user.cpp:15: error: ‘f’ was not declared in this scope user.cpp:20: error: ‘g’ was not declared in this scope user.cpp:20: warning: left-hand operand of comma has no effect user.cpp:21: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result