Compilare: user.cpp: In function ‘int main()’: user.cpp:30:15: warning: unused variable ‘st’ [-Wunused-variable] int n1, n2, st, dr; ^ user.cpp:30:19: warning: unused variable ‘dr’ [-Wunused-variable] int n1, n2, st, dr; ^ user.cpp:32:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(sir1, MAX_N+1, fin); ^ user.cpp:33:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(sir2, MAX_N+1, fin); ^