Compilare: user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘cont’ [-Wunused-variable] int cont; ^ user.cpp:24:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp:19:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i",&n); ^