Compilare: user.cpp: In function ‘int main()’: user.cpp:30:9: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a = v[1].in, b = v[1].sf; ^ user.cpp:24:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &n); ^ user.cpp:26:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &v[i].in, &v[i].sf); ^