Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:15:7: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int c = 0; ^ user.cpp:19:8: error: ‘c’ was not declared in this scope if (!c)g << "NU"; ^ user.cpp: At global scope: user.cpp:23:2: error: ‘f’ does not name a type f.close(); g.close(); ^ user.cpp:23:13: error: ‘g’ does not name a type f.close(); g.close(); ^ user.cpp:24:1: error: expected declaration before ‘}’ token } ^