Compilare: user.cpp: In function ‘int main()’: user.cpp:44:20: warning: unused variable ‘q’ [-Wunused-variable] int n(get_int()), q(get_int()), a, b; ^ user.cpp: In function ‘void next_char()’: user.cpp:205:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, (sizeof buffer) - 1, in); ^