Compilare: user.cpp: In function ‘int main()’: user.cpp:19:21: warning: right operand of comma operator has no effect [-Wunused-value] fout << -1,0; ^ user.cpp:24:21: warning: right operand of comma operator has no effect [-Wunused-value] fout << -1,0; ^ user.cpp:30:25: warning: right operand of comma operator has no effect [-Wunused-value] fout << -1,0; ^ user.cpp:38:27: warning: right operand of comma operator has no effect [-Wunused-value] fout<<-1,0; ^