Compilare: user.cpp: In function ‘int main()’: user.cpp:23:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp: In function ‘int fibo(int)’: user.cpp:15:9: warning: ‘C’ may be used uninitialized in this function [-Wmaybe-uninitialized] return C; ^