Compilare: user.cpp: In function ‘int main()’: user.cpp:15:25: warning: unused variable ‘aux’ [-Wunused-variable] char *prefix, *sufix, *aux; ^ user.cpp:17:6: warning: variable ‘lena’ set but not used [-Wunused-but-set-variable] int lena, lenb; ^ user.cpp:17:12: warning: variable ‘lenb’ set but not used [-Wunused-but-set-variable] int lena, lenb; ^ user.cpp:14:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:19:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s%s%s", s, st, dr); ^