Compilare: user.cpp: In function ‘void readFile()’: user.cpp:24:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:26:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^ user.cpp:22:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:30:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i]); ^